Hollie Speer

Ms. Hollie Speer

School of Rehabilitation and Health Sciences, Faculty of Health, University of Canberra
+2
orcid

Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
28 April 2020 in Antioxidants
Verified
Journal Article
Open access
PDF file
HSHollie Speer
Hollie Speer
NDNathan D'Cunha
Nathan D'Cunha
NANatalie I. Alexopoulos
Natalie I. Alexopoulos
Andrew McKuneAndrew McKune
Andrew McKune
Nenad NaumovskiNenad Naumovski
Nenad Naumovski
Consumption of anthocyanins (ACNs), due to their antioxidant, anti-inflammatory and anti-apoptotic effects, has been proposed for the prevention and treatment of several different diseases and conditions. ACNs are recognized as one of the leading nutraceuticals for prolonging health benefits through the attenuation of oxidative stress, and inflammatory or age-related diseases. Increased consumption of ACNs has the potential to attenuate the damage ensuing from oxidative stress, inflammation, enhance cardiometabolic health, and delay symptoms in predisposed neuropathology. A myriad of evidence supports ACN consumption as complementary or standalone treatment strategies for non-communicable diseases (NCDs) including obesity, diabetes, cardiovascular disease (CVD), neurodegenerative diseases, as well as, more recently, for the modulation of gut bacteria and bone metabolism. While these findings indicate the beneficial effects of ACN consumption, their food sources differ vastly in ACN composition and thus potentially in their physiological effects. Consumption of foods high in ACNs can be recommended for their potential beneficial health effects due to their relatively easy and accessible addition to the everyday diet.

9 June 2021 in American Journal of Hypertension
Verified
Journal Article
Open access
PDF file
HSHollie Speer
Hollie Speer
NDNathan M D’cUnha
Nathan M D’cUnha
Nenad NaumovskiNenad Naumovski
Nenad Naumovski
Andrew McKuneAndrew McKune
Andrew McKune
Hypertension is a major contributor to cardiovascular diseases and premature death, therefore determining factors that contribute to such a high burden of disease is critically important. This study examined anthropometric and physical measurements, as well as blood and saliva biomarkers, as predictors for hypertension using datasets from the 2008 Health and Retirement Study. A total of 2,924 participants (aged 74.84 ± 6.45 years) were included. Binary logistic regression was performed to ascertain the effects of sex, age, telomere length, C-reactive protein (CRP), body mass index (BMI), and additional markers on the odds of developing hypertension. Males had 2.3 times the odds (odds ratio (OR) = 2.313, confidence interval (CI) 95% (1.391, 3.845); P = 0.001) of being hypertensive if they were obese, females had 1.7 times the odds (OR = 1.788, CI 95% (1.260, 2.536); P = 0.001) if overweight, and 2.4 times (OR = 2.479, CI 95% (1.693, 3.630); P < 0.001) if obese. Age in females was an independent predictor where every 1-year increase in age was tied to a 5.1% increase in being hypertensive (OR = 1.051, CI 95% (1.027, 1.075); P 3 mg/l) had 1.4 times the odds (OR = 1.447, CI 95% (1.079, 1.942); P = 0.014). This study provides verification for BMI as a predictor for hypertension and proposes age and CRP as predictors for females. Specific sex differences and life stage should be considered when evaluating hypertension risk to improve clinical outcomes and promote healthy aging.

21 February 2020 in Beverages
Verified
Journal Article
Open access
PDF file
HSHollie Speer
Hollie Speer
NDNathan D'Cunha
Nathan D'Cunha
MDMichael J. Davies
Michael J. Davies
Andrew McKuneAndrew McKune
Andrew McKune
Nenad NaumovskiNenad Naumovski
Nenad Naumovski
Nutritional and ergogenic aid supplementation is prevalent within athletic or general fitness populations, and is only continuing to gain momentum. Taken in isolation or as a combination, amino acid (AA) supplementation has the potential to increase endurance performance among other benefits. L-Arginine (L-Arg) and L-Citrulline (L-Cit) are two AAs proposed to increase endothelial nitric oxide (NO) synthesis, with potential additional physiological benefits, and therefore may contribute to enhanced performance outcomes such as increased power output, or time to exhaustion. However, the appropriate dose for promoting physiological and performance benefits of these AAs, and their potential synergistic effects remains to be determined. Therefore, the aim of this review was to evaluate the varied concentrations used in the current literature, assess the effects of L-Arg and L-Cit in combination on physiological responses and endurance performance, and consider if there is a fundamental basis for providing these supplements in the form of a beverage. A total of six studies were considered eligible for the review which utilized a range of 3–8 g of the AA constituents. The findings support the notion that supplementing with a combination of L-Arg and L-Cit may increase NO production, enhance vasodilation, and therefore increase performance capacity in athletes. A beverage as a carrier for the two AAs is worth considering; however, there remains limited research assessing these outcomes across a consistent range of concentrations in order to see their full potential.

4 August 2021 in Antioxidants
Verified
Journal Article
Open access
PDF file
HSHollie Speer
Hollie Speer
Andrew McKuneAndrew McKune
Andrew McKune
The proportion of adults living with hypertension increases significantly with advancing age. It is therefore important to consider how health and vitality can be maintained by the aging population until end of life. A primary risk factor for the progression of cardiovascular diseases (CVD) is hypertension, so exploring the factors and processes central to this burden of disease is essential for healthy aging. A loss of skeletal muscle quantity and quality is characteristic in normal aging, with a reduction of vasodilatory capacity caused by endothelial dysfunction, and subsequent increase in peripheral resistance and risk for hypertension. Reactive Oxygen and Nitrogen Species (RONS) encompass the reactive derivatives of NO and superoxide, which are continuously generated in contracting skeletal muscle and are essential mediators for cellular metabolism. They act together as intra and intercellular messengers, gene expression regulators, and induce programmed cell death. In excessive amounts RONS can inflict damage to endothelial and skeletal muscle cells, alter signaling pathways or prematurely promote stress responses and potentially speed up the aging process. The age-related increase in RONS by skeletal muscle and endothelial mitochondria leads to impaired production of NO, resulting in vascular changes and endothelial dysfunction. Changes in vascular morphology is an early occurrence in the etiology of CVDs and, while this is also a normal characteristic of aging, whether it is a cause or a consequence of aging in hypertension remains unclear. This review serves to focus on the roles and mechanisms of biological processes central to hypertension and CVD, with a specific focus on the effects of aging muscle and RONS production, as well as the influence of established and more novel interventions to mediate the increasing risk for hypertension and CVD and improve health outcomes as we age.

9 November 2024 in The Journal of Physiology
Verified
Journal Article
Closed access
HSHollie Speer
Hollie Speer
MAMostafa M. Ali
Mostafa M. Ali
NDNathan M. D'CUnha
Nathan M. D'CUnha
Nenad NaumovskiNenad Naumovski
Nenad Naumovski
SPStephan F.E. Praet
Stephan F.E. Praet
AMAndrew J. McKune
Andrew J. McKune

1 July 2025 in American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Verified
Journal Article
Closed access
HSHollie Speer
Hollie Speer
JNJoseph M. Northey
Joseph M. Northey
Sex hormones are known for their roles in reproductive health; however, they pose auxiliary actions on non-reproductive tissues such as the vasculature, notably involving the mediation of endothelial vasodilation and vasoconstriction. Abrupt declines in oestrogen during the menopausal transition have been associated with endothelial dysfunction and a subsequent increase in cardiovascular events. It should come as no surprise that participation in physical activity and exercise are recommended as common strategies to enhance endothelial function, and the effectiveness of different exercise modalities on vascular health outcomes and risk modulation has been investigated extensively. However, despite the awareness of increased cardiovascular disease (CVD) risk during and after menopause, there is conflicting evidence surrounding the efficacy of exercise as a means to enhance endothelial function in females during this critical period. This perspective article intends to discuss the current evidence relating to the female-specific influence of oestradiol on endothelial function, and if there is potential to elicit greater vascular benefits of exercise in late reproductive age by intervening during perimenopause.