Dr Rachel Wong
NHMRC-ARC Dementia Fellow
School of Biomedical Sciences and Pharmacy
- Phone:(02) 4921 6408
Nutrients for Brain Health
Looking for a special combination of food ingredients to delay the onset of dementia, the research of Rachel Wong focuses on the effects of vasoactive nutrients in human circulatory function and its ability to enhance cognitive performance.
Rachel is currently working on a two-year clinical trial as part of her NHMRC-ARC Dementia Research Development Fellowship at the UON Clinical Nutrition Research Centre (CNRC).
“My focus is specifically on improving the health of the blood vessels in the brains of middle-aged and older adults,” Rachel says.
“If we can identify a portfolio of vasoactive nutrients that can restore the vascular damage caused by chronic diseases such as diabetes, hypertension, high cholesterol and obesity, we may be able to delay the acceleration in cognitive decline in those who are at elevated risk of dementia.”
“Improving the circulation does not only lowers the risk of vascular disease and other comorbidities, the improvement of blood flow in the brain can also optimize cognitive function.”
“My work is just a tiny piece of the dementia puzzle, to try to improve quality of life for the ageing population by allowing them to remain independent for as long as possible.”
What is dementia?
Dementia is a broad term that describes a collection of symptoms that are caused by disorders affecting the brain.
The number of patients living with dementia in Australia is expected to increase to 400,000 in less than five years. Even now it is Australia’s second biggest killer.
“Alzheimer's disease is the most common form of dementia characterised by the accumulation of plaques and tangles that damage brain cells” Rachel explains.
“Vascular dementia is the second most common cause associated with problems of circulation of blood to the brain, usually as a result of stroke. It often coexists with Alzheimer’s disease where the overlap between risk factors have indicated a potential link between vascular conditions and development of Alzheimer’s disease. ”
Although Rachel and her colleagues are working tirelessly to identify possible interventions that may delay vascular related cognitive decline, she explains that her work is but a small part of a bigger picture that is the battle against dementia.
Fortunately, the Federal Government recognizes the impact dementia has on dementia sufferers, family and carers, the health system, and ultimately the economy.
In 2014, they announced a $200 million ‘Boosting Dementia Research Initiative’ incorporating two main components over five years.
The urgent acceleration of progress towards finding preventions, treatments, and cures for dementia received $150 million in funding.
Whilst $50 million is allocated to target, co-ordinate and translate the national research effort to ensure existing and new research translates into better care for dementia patients.
Rachel was among the first to investigate the acute effects of trans-resveratrol supplementation in human vascular function.
In collaboration with Director of the Clinical Nutrition Research Centre, Professor Peter Howe, Rachel has studied the effect of resveratrol on the cerebrovascular function of adults with type 2 diabetes mellitus; obese adults; and, postmenopausal women.
“Resveratrol is multi-targeted benefits, and has been shown to support cardiovascular health by reducing inflammation, improving insulin sensitivity and enhancing the ability of blood vessels to dilate” Rachel states.
Pilot study results have been so promising that Rachel has attracted more than half a million dollars in funding to investigate the efficacy of vasoactive nutrients to promote healthy ageing in postmenopausal women.
Although the aim of her new two-year trial is to discover if resveratrol can reverse, or at least delay, cognitive decline in participants, secondary outcomes will also be measured.
“Our pilot studies show that resveratrol was also very effective in terms of improving pain perception and alleviate poor mood associated with menopause.”
“In the long-term trial, we are further exploring the benefits of resveratrol on other aspects of well-being such as sleep quality and depressive symptoms, looking at bone mineral density, total body composition, physical function such as balance and grip strength, and biomarkers like inflammation and insulin sensitivity – all of which have been implicated with ageing.”
Rachel came to Australia from Singapore where she studied Human Movement at the University of South Australia, initially hoping to become a sports coach.
Her honours research on the clinical evaluation of cardiovascular benefits of a nutrient intervention extended into clinical assessment of cognitive functions during her PhD training.
Accordingly, Rachel has expertise in vascular imaging of the systemic and cerebral arteries using ultrasound techniques (flow-mediated dilatation of the brachial artery and transCranial Doppler ultrasound).
“When I was doing my PhD, we didn’t have the headset technology I needed because it was prohibitively expensive,” Rachel recalls.
The fact that she improvised by holding the Doppler in place with her hands for long periods is a testament to her determination.
“I also had to process my images manually rather than continuously recording them. At Newcastle, I have the right equipment and can spend much more time on the research and less on the processing.”
Rachel is recently licensed to operate a DXA (dual energy x-ray absorptiometry) machine that measures bone mineral density.
A Clinical Research Coordinator certified by the Association of Clinical Research Professionals, Rachel has accrued extensive experience in clinical trials management.
Her expertise on subject recruitment and retention, ability to conduct clinical trials in accordance with principles of Good Clinical Practice and maintaining rigour in all aspects of research performance and analysis is often sought.
She is lending her expertise in cerebrovascular ultrasound to colleagues at the School of Biomedical Sciences and Pharmacy to explore the contribution of blood flow in the brain on nausea induced by cyber technology.
Coarctation of the aorta, or congenital narrowing of the aorta, was the focus of another recent collaborative study, done with neurologists and cardiologists at John Hunter Hospital.
Rachel’s neurovascular imaging expertise was again utilized, this time to investigate a suspected link between this congenital heart condition and elevated risk of stroke in later life.
Resveratrol isn’t the first or only bioactive to come under Rachel’s scrutiny.
Rachel is currently assisting Professor Howe in his investigations into the cardiometabolic and cognitive benefits of omega-3 polyunsaturated fatty acid and curcumin supplementation in sedentary obese adults.
Queen of the super lab
Rachel dreams of creating and running a state of the art clinical research facility.
“Of course I also want to further my knowledge in the field of neurovascular and cognitive sciences, and not just looking into bioactives,” Rachel states.
“I want to continue my collaboration with local and international colleagues to look into mechanisms that could ultimately prevent or cure Alzheimer's disease.”
“ I can certainly do that while also overseeing a dream clinical research facility.”
Attached to the University, her facility would be recognized for its scientific rigor and ICH-GCP standards of conducting clinical trials.
“Having a research facility with outstanding track record in conducting trial and accreditation as a clinical trial coordinator, is greatly favoured by commercial contract research organization as it sets the standard for professionalism, research quality and competence, ” Rachel says.
With her self-confessed obsession with rigorous standards in the lab and a thirst for knowledge, plus persistence, determination and impressive management skills, Rachel is the perfect person to turn this dream into reality.
Rachel recently obtained her doctorate degree at the University of South Australia. She is currently a postdoctoral research fellow at the Clinical Nutrition Research Centre, The University of Newcastle. She is a member of International Society of Hypertension, High Blood Pressure Research Council of Australia and the Nutrition Society of Australia. Her research focuses on the effects of bioactive nutrients in human circulatory function and cognitive performance. She was among the first to investigate the acute effects of trans-resveratrol supplementation in human vascular function. Since then Rachel has evaluated effects of chronic consumption of an oat extract on vasodilator function in systemic and cerebral arteries of older adults and its relationship with cognition. Her most recent work follows on from the acute resveratrol study to look at chronic resveratrol supplementation on vasodilator function and its impact on cognitive performance in obese adults. Rachel is currently investigating the relationships between ceberal blood flow haemodynamics and cognitive performance in adults with type 2 diabetes.Research Expertise
Dr Rachel Wong was already recognised as a high performing student during her undergraduate and subsequent Honours research on the clinical evaluation of cardiovascular benefits of a nutrient intervention and subsequently extending into clinical assessment of cognitive functions during her PhD training. Nutrients evaluated were trans-resveratrol and wild green oat extract. Rachel has expertise in vascular imaging of the systemic and cerebral arteries using ultrasound techniques (flow-mediated dilatation of the brachial artery and transCranial Doppler ultrasound) that enable quantification of the responsiveness of blood vessels to meet specific demands of the body. She also has extensive experience in clinical trials management including knowledge on subject recruitment and retention, ability to conduct clinical trials in accordance with principles of Good Clinical Practice and maintaining rigour in all aspects of research performance and analysis. She has recently completed a clinical evaluation of the olive leaf extract combination on 24-hr ambulatory blood pressure in hypertensive adults.
Undergraduate teaching: (1) Appointed as a tutor and practical demonstrator for Human Physiology and Human Nutrition courses offered to undergraduate students in the Division of Health Sciences. (2) Examined an honours thesis: ‘Effects of exercise on systemic and cerebral vascular function’. Training of research students in: (1) ultrasound imaging and analysis of flow-mediated dilatation in the brachial artery and cerebrovascular responsiveness to hypercapnic and cognitive stimuli using transCranial Doppler ultrasound. (2) administration of dementia status test and cognitive tests. (3) clinical trial management in accordance with the ICH-GCP Standard. Co-Supervision at University of Newcastle: (1) Neuropsychology Research Masters graduate (thesis: 'Cerebral blood flow and cognition in diabetes’). (2) PhD candidate in ‘Cerebral hemodynamics following visuo-vestibular-invoked nausea’. (3) Overseas exchange undergraduate students
Clinical Research Coordinator (CCRC, Association of Clinical Research Professionals) - conduct clinical trials under ICH-GCP guidelines.
- PhD (Health Sciences), University of South Australia
- Bachelor of Applied Science (Human Movement), University of South Australia
- Bachelor of Health Sciences (Honours), University of South Australia
- Cardiovascular health
- Human Nutrition
- Human Physiology
- Transcranial Doppler ultrasound
- Mandarin (Fluent)
Fields of Research
|110201||Cardiology (incl. Cardiovascular Diseases)||30|
|170299||Cognitive Sciences not elsewhere classified||30|
|Dates||Title||Organisation / Department|
|1/1/2009 -||Membership - Nutritional Society of Australia||Nutritional Society of Australia
For publications that are currently unpublished or in-press, details are shown in italics.
Journal article (30 outputs)
Kuszewski JC, Wong RHX, Wood LG, Howe PRC, 'Effects of fish oil and curcumin supplementation on cerebrovascular function in older adults: A randomized controlled trial', Nutrition, Metabolism and Cardiovascular Diseases, 30 625-633 (2020)
© 2019 The Italian Society of Diabetology, the Italian Society for the Study of Atherosclerosis, the Italian Society of Human Nutrition, and the Department of Clinical Medicine an... [more]
© 2019 The Italian Society of Diabetology, the Italian Society for the Study of Atherosclerosis, the Italian Society of Human Nutrition, and the Department of Clinical Medicine and Surgery, Federico II University Background and aims: Chronic conditions such as obesity, which contribute to endothelial dysfunction in older adults, can cause impairments in cerebrovascular perfusion, which is associated with accelerated cognitive decline. Supplementing the diet with bioactive nutrients that can enhance endothelial function, such as fish oil or curcumin, may help to counteract cerebrovascular dysfunction. Methods and results: A 16-week double-blind, randomized placebo-controlled trial was undertaken in 152 older sedentary overweight/obese adults (50¿80 years, body mass index: 25¿40 kg/m2) to investigate effects of fish oil (2000 mg docosahexaenoic acid + 400 mg eicosapentaenoic acid/day), curcumin (160 mg/day) or a combination of both on cerebrovascular function (measured by Transcranial Doppler ultrasound), systemic vascular function (blood pressure, heart rate and arterial compliance) and cardiometabolic (fasting glucose and blood lipids) and inflammatory (C-reactive protein) biomarkers. The primary outcome, cerebrovascular responsiveness to hypercapnia, was not affected by the interventions. However, cerebral artery stiffness was significantly reduced in males following fish oil supplementation (P = 0.007). Furthermore, fish oil reduced heart rate (P = 0.038) and serum triglycerides (P = 0.006) and increased HDL cholesterol (P = 0.002). Curcumin did not significantly affect these outcomes either alone or in combination with fish oil. Conclusion: Regular supplementation with fish oil but not curcumin improved biomarkers of cardiovascular and cerebrovascular function. The combined supplementation did not result in additional benefits. Further studies are warranted to identify an efficacious curcumin dose and to characterize (in terms of sex, BMI, cardiovascular and metabolic risk factors) populations whose cerebrovascular and cognitive functions might benefit from either intervention. Clinical trial registration: ACTRN12616000732482p.
Thaung Zaw JJ, Howe PRC, Wong RHX, 'Sustained Cerebrovascular and Cognitive Benefits of Resveratrol in Postmenopausal Women.', Nutrients, 12 (2020)
Wong RH, Zaw JJT, Xian CJ, Howe PR, 'Regular supplementation with resveratrol improves bone mineral density in postmenopausal women: a randomised, placebo-controlled trial', Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research, (2020)
This article is protected by copyright. All rights reserved. Resveratrol, a naturally-occurring polyphenol in red grapes and berries, can act as a phytoestrogen. It has been shown... [more]
This article is protected by copyright. All rights reserved. Resveratrol, a naturally-occurring polyphenol in red grapes and berries, can act as a phytoestrogen. It has been shown to improve both systemic and cerebral circulatory functions, possibly through activation of endothelial estrogen receptors. In vitro and in vivo studies in rodent models also indicate a bone-protective role for resveratrol, particularly in ovariectomised rat models that mimic postmenopausal osteoporosis caused by estrogen deficiency. Hypothesising a circulatory benefit of resveratrol in bone tissue, we investigated whether resveratrol supplementation could improve bone health in postmenopausal women. The Resveratrol for Healthy Ageing in Women (RESHAW) trial was a 24-month randomised, double-blind, placebo-controlled, two-period crossover intervention conducted to evaluate the effects of resveratrol (75mg twice daily) on cognition, cerebrovascular function, bone health, cardiometabolic markers and well-being in postmenopausal women. Following 12 months of supplementation with resveratrol versus placebo, there were positive effects on bone density in the lumbar spine (+0.016±0.003 g/cm2 ) and neck of femur (+0.005±0.002 g/cm2 ), which were accompanied by a 7.24% reduction in C-terminal telopeptide type-1 collagen levels, a bone resorption marker, compared to placebo. The increase in bone mineral density in the femoral neck resulted in an improvement in T-score (+0.070±0.018) and a reduction in the 10-year probability of major and hip fracture risk. The magnitude of improvement was higher in women with poor bone health biomarker status. Importantly, the improvement in femoral neck T-score with resveratrol correlated with improvement in perfusion. Our sub-analysis also revealed that the bone-protective benefit of resveratrol was greater in participants who supplemented with vitamin D plus calcium. Regular supplementation with 75mg of resveratrol twice daily has the potential to slow bone loss in the lumbar spine and femoral neck, common fracture sites in postmenopausal women without overt osteoporosis. This article is protected by copyright. All rights reserved.
Brook E, Mamo J, Wong R, Al-Salami H, Falasca M, Lam V, Takechi R, 'Blood-brain barrier disturbances in diabetes-associated dementia: Therapeutic potential for cannabinoids', Pharmacological Research, 141 291-297 (2019) [C1]
© 2019 Elsevier Ltd Type-2 diabetes (T2D) increases the risk of dementia by ¿5-fold, however the mechanisms by which T2D increases dementia risk remain unclear. Evidence suggests ... [more]
© 2019 Elsevier Ltd Type-2 diabetes (T2D) increases the risk of dementia by ¿5-fold, however the mechanisms by which T2D increases dementia risk remain unclear. Evidence suggests that the heightened inflammation and oxidative stress in T2D may lead to disruption of the blood-brain barrier (BBB), which precedes premature cognitive decline. Studies show that vascular-targeted anti-inflammatory treatments protect the BBB by attenuating neuroinflammation, and in some studies attenuate cognitive decline. Yet, this potential pathway is understudied in T2D-associated cognitive impairment. In recent years, therapeutic potential of cannabinoids has gained much interest. The two major cannabinoids, cannabidiol and tetrahydrocannabinol, exert anti-inflammatory and vascular protective effects, however few studies report their potential for reversing BBB dysfunction, particularly in T2D. Therefore, in this review, we summarize the current findings on the role of BBB dysfunction in T2D-associated dementia and consider the potential therapeutic use of cannabinoids as a protectant of cerebrovascular BBB protection.
Wong R, Al-Omary M, Baker D, Spratt N, Boyle A, Baker N, et al., 'Cognitive dysfunction is associated with abnormal responses in cerebral blood flow in patients with single ventricular physiology: Novel insights from transcranial Doppler ultrasound', Congenital Heart Disease, 14 638-644 (2019) [C1]
© 2019 Wiley Periodicals, Inc. Objectives: Improvements in the management of complex congenital heart disease, including those with single ventricle physiology, have resulted in i... [more]
© 2019 Wiley Periodicals, Inc. Objectives: Improvements in the management of complex congenital heart disease, including those with single ventricle physiology, have resulted in increased survival. As this population ages, the recognition of cognitive impairment is increasingly important. At present, little is known about the potential mechanisms of cognitive dysfunction. In this cross-sectional study, we aimed to characterize the nature of abnormalities in cerebral blood flow and the relationship to cognitive deficits in adults with single ventricular physiology. Patients: Ten adults with single ventricular physiology (age 18-40¿years) and 12 age- and gender-matched controls underwent transcranial Doppler ultrasound and accompanying cognitive assessment. Outcome Measures: Patients underwent neuropsychological testing that assessed differing cognitive domains, with subjective cognitive decline determined from a 24-question survey. Transcranial Doppler ultrasound was used to assess baseline cerebral blood flow as well as change in cerebral blood flow velocities from baseline and during cognitive testing. Age, ethnicity, individual, and parental education levels were considered in the multivariate analyses. Results: On assessment of cognitive function, the patient group performed more poorly across each of the measured domains. The control group had a significantly greater increase in cerebral blood flow in response to cognitive stimuli compared to the patient cohort; these differences in response to cognitive stimuli were seen to a similar extent across each of the measured cognitive domains. Conclusion: Adults with Fontan physiology are underperforming in assessments of executive function with associated abnormalities in cerebral perfusion potentially contributing to cognitive deficits.
Howe PRC, Evans HM, Kuszewski JC, Wong RHX, 'Effects of Long Chain Omega-3 Polyunsaturated Fatty Acids on Brain Function in Mildly Hypertensive Older Adults', Nutrients, 10 (2018) [C1]
Kuszewski J, Wong RHX, Howe PR, 'Can Curcumin Counteract Cognitive Decline? Clinical Trial Evidence and Rationale for Combining -3 Fatty Acids with Curcumin', Advances in Nutrition, 9 105-113 (2018) [C1]
Gavgani AM, Wong RHX, Howe PRC, Hodgson DM, Walker FR, Nalivaiko E, 'Cybersickness-related changes in brain hemodynamics: A pilot study comparing transcranial Doppler and near-infrared spectroscopy assessments during a virtual ride on a roller coaster.', Physiol Behav, 191 56-64 (2018) [C1]
Wong RHX, 'Resveratrol Counteracts Insulin Resistance Potential Role of the Circulation', Nutrients, 10 1-10 (2018) [C1]
Jay Jay Thaung Zaw, Howe P, Wong RHX, 'Postmenopausal health interventions: Time to move on from the Women s Health Initiative?', Ageing Research Reviews, 48 79-86 (2018) [C1]
Kuszewski JC, Wong RHX, Howe PRC, 'Effects of Long-Chain Omega-3 Polyunsaturated Fatty Acids on Endothelial Vasodilator Function and Cognition-Are They Interrelated', NUTRIENTS, 9 (2017) [C1]
Evans HM, Howe PRC, Wong RHX, 'Effects of Resveratrol on Cognitive Performance, Mood and Cerebrovascular Function in Post-Menopausal Women; A 14-Week Randomised Placebo-Controlled Intervention Trial', NUTRIENTS, 9 (2017) [C1]
Wong R, Ahmad W, Davies A, Spratt N, Boyle A, Levi C, et al., 'Assessment of cerebral blood flow in adult patients with aortic coarctation', Cardiology in the Young, 27 1606-1613 (2017) [C1]
© Cambridge University Press 2017. Background Survival into adult life in patients with aortic coarctation is typical following surgical and catheter-based techniques to relieve o... [more]
© Cambridge University Press 2017. Background Survival into adult life in patients with aortic coarctation is typical following surgical and catheter-based techniques to relieve obstruction. Late sequelae are recognised, including stroke, hypertension, and intracerebral aneurysm formation, with the underlying mechanisms being unclear. We hypothesised that patients with a history of aortic coarctation may have abnormalities of cerebral blood flow compared with controls. Methods Patients with a history of aortic coarctation underwent assessment of cerebral vascular function. Vascular responsiveness of intracranial vessels to hypercapnia and degree of cerebral artery stiffness using Doppler-derived pulsatility indices were used. Response to photic stimuli was used to assess neurovascular coupling, which reflects endothelial function in response to neuronal activation. Patient results were compared with age- and sex-matched controls. Results A total of 13 adult patients (males=10; 77%) along with 13 controls underwent evaluation. The mean age was 36.1±3.7 years in the patient group. Patients with a background of aortic coarctation were noted to have increased pulse pressure on blood pressure assessment at baseline with increased intracranial artery stiffness compared with controls. Patients with a history of aortic coarctation had less reactive cerebral vasculature to hypercapnic stimuli and impaired neurovascular coupling compared with controls. Results Adult patients with aortic coarctation had increased intracranial artery stiffness compared with controls, in addition to cerebral vasculature showing less responsiveness to hypercapnic and photic stimuli. Further studies are required to assess the aetiology and consequences of these documented abnormalities in cerebral blood flow in terms of stroke risk, cerebral aneurysm formation, and cognitive dysfunction.
Zaw JJT, Howe PRC, Wong RHX, 'Does phytoestrogen supplementation improve cognition in humans? A systematic review', Annals of the New York Academy of Sciences, 1403 150-163 (2017) [C1]
© 2017 New York Academy of Sciences. Recent evidence indicates that resveratrol, a phytoestrogen, can improve cognitive function in postmenopausal women by enhancing cerebral vaso... [more]
© 2017 New York Academy of Sciences. Recent evidence indicates that resveratrol, a phytoestrogen, can improve cognitive function in postmenopausal women by enhancing cerebral vasodilator responsiveness. We examine the effects of phytoestrogen supplementation on cognition and compare resveratrol with other phytoestrogens. Databases were searched for reports of randomized controlled trials (RCTs) containing terms describing phytoestrogens together with terms relating to cognition. Effect sizes were determined for changes in cognition. We identified 23 RCTs, 15 with isoflavone and eight with resveratrol or grape formulations. Six soy isoflavone studies showed positive cognitive effects of medium size. Greater benefits were seen in women who were <10 years postmenopausal and supplemented for <6 months. Small-to-medium effect¿size cognitive benefits of resveratrol were seen in four studies of older adults of mixed gender and in postmenopausal women who took 150¿200 mg resveratrol daily for at least 14 weeks. No benefits were seen in three studies using red clover or grape formulations. Supplementation with either soy isoflavone or resveratrol improved executive function and memory domains of cognitively normal older adults in half of the included studies, mostly with medium effect sizes. The cognitive benefit of resveratrol was related to improved cerebral perfusion.
Wong RHX, Evans HM, Howe PRC, 'Resveratrol supplementation reduces pain experience by postmenopausal women', Menopause, 24 916-922 (2017) [C1]
© 2017 by The North American Menopause Society. Objective: Pain is a common complaint among postmenopausal women. It has been postulated that vascular dysfunction caused by estrog... [more]
© 2017 by The North American Menopause Society. Objective: Pain is a common complaint among postmenopausal women. It has been postulated that vascular dysfunction caused by estrogen decline at menopause plays a key role in the initiation and progression of degradative joint disease, namely age-related osteoarthritis. We evaluated whether supplementation with resveratrol, a phytoestrogen, could improve aspects of well-being such as chronic pain that is commonly experienced by postmenopausal women. Methods: A 14-week randomized, double-blind, placebo-controlled intervention with trans-resveratrol (75mg, twice daily) was conducted in 80 healthy postmenopausal women. Aspects of well-being, including pain, menopausal symptoms, sleep quality, depressive symptoms, mood states, and quality of life were assessed by Short form-36 at baseline and at the end of treatment. Rating scales were averaged to provide a composite score representing overall well-being. Cerebral vasodilator responsiveness to hypercapnia was also assessed as a surrogate marker for cerebrovascular function. Results: Compared with placebo treatment, there was a significant reduction in pain and an improvement in total well-being after resveratrol supplementation. Both benefits, including measures of quality of life, correlated with improvements in cerebrovascular function. Conclusions: Our preliminary findings indicate potential for resveratrol treatment to reduce chronic pain in age-related osteoarthritis. Resveratrol consumption may also boost perceptions of well-being in postmenopausal women. Further investigation to elucidate underlying mechanisms is warranted.
Nealon RS, Howe PRC, Jansen L, Garg M, Wong RHX, 'Impaired cerebrovascular responsiveness and cognitive performance in adults with type 2 diabetes', Journal of Diabetes and its Complications, 31 462-467 (2017) [C1]
© 2016 Elsevier Inc. Aim Cognitive deficits in type 2 diabetes mellitus (T2DM) may be partly attributable to stiffness in cerebral arteries and impaired vasodilator function, limi... [more]
© 2016 Elsevier Inc. Aim Cognitive deficits in type 2 diabetes mellitus (T2DM) may be partly attributable to stiffness in cerebral arteries and impaired vasodilator function, limiting the ability to increase blood flow in brain regions to meet cognitive demands. We undertook a comparison of cerebrovascular responsiveness (CVR) and cognitive performance in adults with and without T2DM. Methods Older adults with (50) and without (Herath, Cherbuin, Eramudugolla, & Anstey, 2016) T2DM underwent transcranial Doppler ultrasound measurements of basal cerebral mean blood flow velocity (MBFV) and pulsatility index (PI), a measure of arterial stiffness, in the middle cerebral arteries (MCA). A battery of tasks assessing domains of working memory, executive function and information processing/motor speed was then administered while MBFV was recorded. CVR to cognitive tasks was calculated as a percentage increase in MBFV from the basal level. Results There was no difference in basal MBFV between groups. However, PI was 14% higher in the T2DM group (P¿<¿0.05), who performed poorer across all cognitive domains assessed and displayed poorer CVR in three tasks. Cognitive performance was inversely related to the PI/MBFV ratio, an indicator of intracranial stenosis. Discussion Impaired cerebral perfusion during mental tasks is accompanied by poor cognitive performance and stiffness in the cerebral vessels.
Evans HM, Howe PRC, Wong RHX, 'Clinical evaluation of effects of chronic resveratrol supplementation on cerebrovascular function, cognition, mood, physical function and general well-being in postmenopausal women rationale and study design', Nutrients, 8 (2016) [C1]
© 2016 by the authors; licensee MDPI, Basel, Switzerland. Background: This methodological paper presents both a scientific rationale and a methodological approach for investigatin... [more]
© 2016 by the authors; licensee MDPI, Basel, Switzerland. Background: This methodological paper presents both a scientific rationale and a methodological approach for investigating the effects of resveratrol supplementation on mood and cognitive performance in postmenopausal women. Postmenopausal women have an increased risk of cognitive decline and dementia, which may be at least partly due to loss of beneficial effects of estrogen on the cerebrovasculature. We hypothesise that resveratrol, a phytoestrogen, may counteract this risk by enhancing cerebrovascular function and improving regional blood flow in response to cognitive demands. A clinical trial was designed to test this hypothesis. Method: Healthy postmenopausal women were recruited to participate in a randomised, double-blind, placebo-controlled (parallel comparison) dietary intervention trial to evaluate the effects of resveratrol supplementation (75 mg twice daily) on cognition, cerebrovascular responsiveness to cognitive tasks and overall well-being. They performed the following tests at baseline and after 14 weeks of supplementation: Rey Auditory Verbal Learning Test, Cambridge Semantic Memory Battery, the Double Span and the Trail Making Task. Cerebrovascular function was assessed simultaneously by monitoring blood flow velocity in the middle cerebral arteries using transcranial Doppler ultrasound. Conclusion: This trial provides a model approach to demonstrate that, by optimising circulatory function in the brain, resveratrol and other vasoactive nutrients may enhance mood and cognition and ameliorate the risk of developing dementia in postmenopausal women and other at-risk populations.
Wong RHX, Nealon RS, Scholey A, Howe PRC, 'Low dose resveratrol improves cerebrovascular function in type 2 diabetes mellitus', Nutrition, Metabolism and Cardiovascular Diseases, 26 393-399 (2016) [C1]
© 2016 The Italian Society of Diabetology, the Italian Society for the Study of Atherosclerosis, the Italian Society of Human Nutrition, and the Department of Clinical Medicine an... [more]
© 2016 The Italian Society of Diabetology, the Italian Society for the Study of Atherosclerosis, the Italian Society of Human Nutrition, and the Department of Clinical Medicine and Surgery, Federico II University. Background and aims: Progressive microvascular dysfunction in type 2 diabetes mellitus (T2DM) may impair the ability of cerebral vessels to supply blood to brain regions during local metabolic demand, thereby increasing risks of dementia. Having previously demonstrated that resveratrol can enhance vasodilator function in the systemic circulation, we hypothesised that resveratrol could similarly benefit the cerebral circulation. We aimed to determine the most efficacious dose of resveratrol to improve cerebral vasodilator responsiveness (CVR) in T2DM. Methods and results: In a double-blind, placebo-controlled, balanced crossover intervention, 36 dementia-free, non-insulin dependent T2DM older adults (49-78 years old) consumed single doses of synthetic trans-resveratrol (0, 75, 150, and 300 mg) at weekly intervals. Transcranial Doppler ultrasound was used to assess CVR to a hypercapnic stimulus, both before and 45 min after treatment. CVR, measured bilaterally in the middle cerebral arteries (MCA) and posterior cerebral arteries (PCA), was expressed as the percentage change in mean blood flow velocity from baseline to the peak velocity attained during hypercapnia. Resveratrol consumption increased CVR in the MCA; mean within-individual changes for each dose from placebo were 13.8 ± 3.5% for 75 mg (P = 0.001), 8.9 ± 3.5% for 150 mg (P = 0.016), and 13.7 ± 3.3% for 300 mg (P < 0.001); only the 75 mg dose was efficacious in the PCA (13.2 ± 4.5%, P = 0.016). Conclusions: Our results provide the first clinical evidence of an acute enhancement of vasodilator responsiveness in cerebral vessels following consumption of resveratrol in this population who are known to have endothelial dysfunction and sub-clinical cognitive impairment. Importantly, maximum improvement was observed with the lowest dose used. Clinical trial registration: ACTRN12614000891628 (. www.anzctr.org.au).
Wong RHX, Raederstorff D, Howe PRC, 'Acute resveratrol consumption improves neurovascular coupling capacity in adults with type 2 diabetes mellitus', Nutrients, 8 (2016) [C1]
© 2016 by the authors; licensee MDPI, Basel, Switzerland. Background: Poor cerebral perfusion may contribute to cognitive impairment in type 2 diabetes mellitus (T2DM). We conduct... [more]
© 2016 by the authors; licensee MDPI, Basel, Switzerland. Background: Poor cerebral perfusion may contribute to cognitive impairment in type 2 diabetes mellitus (T2DM). We conducted a randomized controlled trial to test the hypothesis that resveratrol can enhance cerebral vasodilator function and thereby alleviate the cognitive deficits in T2DM.We have already reported that acute resveratrol consumption improved cerebrovascular responsiveness (CVR) to hypercapnia. We now report the effects of resveratrol on neurovascular coupling capacity (CVR to cognitive stimuli), cognitive performance and correlations with plasma resveratrol concentrations. Methods: Thirty-six T2DM adults aged 40¿80 years were randomized to consume single doses of resveratrol (0, 75, 150 and 300 mg) at weekly intervals. Transcranial Doppler ultrasound was used to monitor changes in blood flow velocity (BFV) during a cognitive test battery. The battery consisted of dual-tasking (finger tapping with both Trail Making task and Serial Subtraction 3 task) and a computerized multi-tasking test that required attending to four tasks simultaneously. CVR to cognitive tasks was calculated as the per cent increase in BFV from pre-test basal to peak mean blood flow velocity and also as the area under the curve for BFV. Results: Compared to placebo, 75 mg resveratrol significantly improved neurovascular coupling capacity, which correlated with plasma total resveratrol levels. Enhanced performance on the multi-tasking test battery was also evident following 75 mg and 300 mg of resveratrol. Conclusion: a single 75 mg dose of resveratrol was able to improve neurovascular coupling and cognitive performance in T2DM. Evaluation of benefits of chronic resveratrol supplementation is now warranted.
Wong RHX, Evans HM, Howe PRC, 'Poor cerebrovascular function is an early marker of cognitive decline in healthy postmenopausal women', Alzheimer's and Dementia: Translational Research and Clinical Interventions, 2 162-168 (2016) [C1]
© 2016 The Authors Introduction Impairment of cerebrovascular function becomes evident after menopause. No study has yet explored relationships between deficits in cerebrovascular... [more]
© 2016 The Authors Introduction Impairment of cerebrovascular function becomes evident after menopause. No study has yet explored relationships between deficits in cerebrovascular function, cognitive performance, and mood in postmenopausal women. Method Cerebrovascular function was assessed in 80 healthy postmenopausal women by monitoring blood flow velocity (BFV) in the middle and posterior cerebral arteries using transcranial Doppler ultrasound at rest, following a hypercapnic challenge, and during performance of a cognitive test battery; the latter assessed domains of memory and executive functions. Various measures of mood (i.e., Profile of Mood States and Center for Epidemiological Studies Depression Scale) were also assessed. Results Cerebral artery elasticity and BFV responsiveness to cognitive tests (neurovascular coupling) correlated with cognitive performance but not with depressive symptoms or mood states. Mood deficits were related to poor cognitive performance. Conclusion These results highlight the importance of adequate cerebral perfusion for optimized cognitive function in healthy postmenopausal women. Preventative strategies to attenuate accelerated cognitive decline should also consider restoring cerebrovascular function.
Wong R, Garg M, Wood L, Howe P, 'Antihypertensive Potential of Combined Extracts of Olive Leaf, Green Coffee Bean and Beetroot: A Randomized, Double-Blind, Placebo-Controlled Crossover Trial', Nutrients, 6 4881-4894 (2014) [C1]
Wong RHX, Scholey A, Howe PRC, 'Assessing Premorbid Cognitive Ability in Adults With Type 2 Diabetes Mellitus-a Review With Implications for Future Intervention Studies', CURRENT DIABETES REPORTS, 14 (2014) [C1]
Wong RHX, Coates AM, Buckley JD, Howe PR, 'Evidence for circulatory benefits of resveratrol in humans', Annals of the New York Academy of Sciences, 1290 52-58 (2013) [C1]
Wong RHX, Berry NM, Coates AM, Buckley JD, Bryan J, Kunz I, Howe PRC, 'Chronic resveratrol consumption improves brachial flow-mediated dilatation in healthy obese adults', Journal of Hypertension, 31 1819-1827 (2013) [C1]
Background: We have previously demonstrated acute dose-dependent increases of flow-mediated dilatation (FMD) in the brachial artery after resveratrol consumption in mildly hyperte... [more]
Background: We have previously demonstrated acute dose-dependent increases of flow-mediated dilatation (FMD) in the brachial artery after resveratrol consumption in mildly hypertensive, overweight/obese adults. Resveratrol supplementation has also been shown to increase cerebral blood flow acutely, without affecting cognition. Objectives: To evaluate the effects of chronic resveratrol supplementation on both FMD and cognitive performance. Method: Twenty-eight obese but otherwise healthy adults (BMI: 33.3±0.6kg/m 2) were randomized to take a single 75 mg capsule of trans-resveratrol (Resvida) or placebo daily for 6 weeks each in a double-blind crossover supplementation trial. Blood pressure, arterial compliance, FMD, and performance on the Stroop Color-Word Test were assessed at the end of each 6-week intervention period while fasted and at least 18 h after taking the last daily capsule. An additional capsule of the same supplement was then taken. FMD assessment was repeated 1 h later. Results: Chronic resveratrol supplementation for 6 weeks was well tolerated and resulted in a 23% increase in FMD compared with placebo (P = 0.021, paired t-test). The extent of increase correlated negatively with baseline FMD (r= -0.47, P=0.01). A single dose of resveratrol (75 mg) following chronic resveratrol supplementation resulted in a 35% greater acute FMD response than the equivalent placebo supplementation. These FMD improvements remained significant after adjusting for baseline FMD. Blood pressure, arterial compliance, and all components of the Stroop Color-Word Test were unaffected by chronic resveratrol supplementation. Conclusion: Daily resveratrol consumption was well tolerated and has the potential to maintain healthy circulatory function in obese adults. © 2013 Wolters Kluwer Health Lippincott Williams & Wilkins.
|Show 27 more journal articles|
Conference (7 outputs)
Wong RHX, Jnasen L, Nealon R, Garg ML, Howe PRC, 'A PILOT INVESTIGATION OF CEREBROVASCULAR RESPONSIVENESS TO A NEUROPSYCHOLOGICAL TEST BATTERY IN ADULTS WITH TYPE 2 DIABETES MELLITUS', HYPERTENSION, Adelaide, AUSTRALIA (2015) [E3]
Wong RHX, Nealon R, Scholey A, Howe PRC, 'Dose response effect of resveratrol on cerebrovascular function in adults with type 2 diabetes mellitus', Proceedings of the 2015 Resveratrol Regional Meeting Dijon France, Dijon, France (2015) [E3]
Wong RHX, Nealon R, Scholey A, Howe PRC, 'Resveratrol consumption improves cerebrovascular function in type 2 diabetes mellitus (T2DM)', Proceedings of the Nutrition Society of Australia, Wellington, New Zealand (2015) [E3]
Nealon R, Howe PRC, Jansen L, Garg ML, Wong RHX, 'Impaired cerebrovascular responsiveness to a working memory task in older adults with type 2 diabetes mellitus (T2DM)', Proceedings of the Nutrition Society of Australia, Wellington, New Zealand (2015) [E3]
evans H, wong R, Howe PRC, 'Is cognitive impairment in post-menopausal women attributable to poor cerebral perfusion? Baseline results of the ResFem Study', Book of Abstracts, Wellington, New Zealand (2015) [E3]
Wong RHX, Nealon R, Jansen L, Garg M, Howe PRC, 'Cerebrovascular responsiveness to cognitive stimuli in adults with type 2 diabetes mellitus', Combined Abstracts of the 2015 Australian Psychology Conferences, Port Stephens, Australia (2015) [E3]
|Show 4 more conferences|
Grants and Funding
|Number of grants||16|
Click on a grant title below to expand the full details for that specific grant.
20201 grants / $30,000
Funding body: Evolva SA
20191 grants / $20,000
Assessment of vascular function using novel biomarkers in patients with adult congenital heart disease$20,000
Funding body: Hunter Medical Research Institute
|Funding body||Hunter Medical Research Institute|
|Project Team||Doctor Nicholas Collins, Associate Professor Aaron Sverdlov, Mr Conagh Kelly, Professor Andrew Boyle, Doctor Rachel Wong|
|Type Of Funding||C3120 - Aust Philanthropy|
20181 grants / $10,000
Assessment of neurovascular function and cognition in adult patients with complex congenital heart disease$10,000
Funding body: John Hunter Hospital Charitable Trust
|Funding body||John Hunter Hospital Charitable Trust|
|Project Team||Dr Nick Collins, Doctor Rachel Wong, Emeritus Professor Peter Howe, Professor Neil Spratt, Professor Andrew Boyle, Conjoint Professor Chris Levi|
|Type Of Funding||C3112 - Aust Not for profit|
20172 grants / $45,000
Relationships between cerebrovascular function and the incidence and severity of migraine in premenopausal women and the potential impact of trans-resveratrol, acutely and chronically, on menstrual mi$25,000
Funding body: Hunter Medical Research Institute
Prevention of type-1 diabetes induced neurocognitive deficits by modulating the plasticity of cerebrovascular function: a pilot$20,000
Funding body: Hunter Medical Research Institute
20164 grants / $946,766
Funding body: NHMRC (National Health & Medical Research Council)
|Funding body||NHMRC (National Health & Medical Research Council)|
|Project Team||Doctor Rachel Wong|
|Scheme||NHMRC-ARC Dementia Research Development Fellowship|
|Type Of Funding||Aust Competitive - Commonwealth|
Cardiometabolic and cognitive benefits of omega-3 polyunsaturated fatty acid and curcumin supplementation in older, sedentary and overweight Australians$218,182
Funding body: Blackmores Limited
Funding body: Evolva SA
Assisting post-menopausal women towards healthy ageing – can resveratrol enhance mood, physical function and cerebrovascular function and counteract cognitive decline?$15,944
Funding body: DSM Nutritional Products AG
20152 grants / $36,500
Effects of long-chain Omega-3 polyunsaturated fatty acid (LCn-3PUFA) supplementation on cerebral circulation and cognitive function$35,000
Funding body: Westfund Health
Funding body: University of Newcastle - Faculty of Health and Medicine
|Funding body||University of Newcastle - Faculty of Health and Medicine|
|Project Team||Doctor Rachel Wong|
|Type Of Funding||Internal|
20144 grants / $147,347
Funding body: CRC for High Integrity Australian Pork
|Funding body||CRC for High Integrity Australian Pork|
|Project Team||Professor Manohar Garg, Emeritus Professor Peter Howe, Doctor Rachel Wong|
|Type Of Funding||Other Public Sector - Commonwealth|
Dose response evaluation of resveratrol supplementation on cerebrovascular function, mood and cognitive performance in type 2 diabetes mellitus$45,000
Funding body: NHMRC (National Health & Medical Research Council)
|Funding body||NHMRC (National Health & Medical Research Council)|
|Project Team||Emeritus Professor Peter Howe, Doctor Rachel Wong, Professor Andrew Scholey|
|Scheme||Dementia Collaborative Research Centres (DCRC)|
|Type Of Funding||Other Public Sector - Commonwealth|
Dose response evaluation of resveratrol supplementation on cerebrovascular function, mood and cognitive performance in type 2 diabetes mellitus$27,047
Funding body: DSM Nutritional Products AG
|Funding body||DSM Nutritional Products AG|
|Project Team||Emeritus Professor Peter Howe, Doctor Rachel Wong, Professor Manohar Garg, Professor Andrew Scholey|
|Type Of Funding||International - Non Competitive|
Assisting post-menopausal women towards healthy ageing - can resveratrol enhance mood and counteract cognitive decline?$25,000
Funding body: Hunter Medical Research Institute
20131 grants / $165,000
Funding body: Newcastle Innovation
Number of supervisions
|Commenced||Level of Study||Research Title||Program||Supervisor Type|
|2018||PhD||Can Resveratrol Supplementation Mitigate Menstrual Migraine?||PhD (Human Physiology), Faculty of Health and Medicine, The University of Newcastle||Principal Supervisor|
|2017||PhD||Delaying Early Cognitive Decline with Vasoactive Nutrient Supplementation||PhD (Human Physiology), Faculty of Health and Medicine, The University of Newcastle||Co-Supervisor|
|2016||PhD||The role of resveratrol in promoting healthy ageing in post-menopausal women||PhD (Human Physiology), Faculty of Health and Medicine, The University of Newcastle||Principal Supervisor|
January 14, 2019
May 17, 2017
February 16, 2017
March 15, 2016
April 27, 2015
August 24, 2014