Browsing by Author "Chrismas, Bryna C.R."
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Additional clothing increases heat load in elite female Rugby sevens players
Henderson, Mitchell J.; Chrismas, Bryna C.R.; Stevens, Christopher J.; Novak, Andrew; Fransen, Job; Coutts, Aaron J.; Taylor, Lee... more authors ... less authors ( Human Kinetics Publishers Inc. , 2021 , Article)Purpose: To determine whether elite female rugby sevens players are exposed to core temperatures (Tc) during training in the heat that replicate the temperate match demands previously reported and to investigate whether ... -
Adherence and retention to the self-managed community-based Step Into Health program in Qatar (2012–2019)
Chrismas, Bryna C.R.; Majed, Lina; Al-Mohannadi, Abdulla Saeed; Sayegh, Suzan ( Frontiers Media SA , 2022 , Article)Purpose: Investigate adherence and retention to the “Step Into Health (SIH)” initiative (www.stepintohealth.qa [website access only available from within the State of Qatar]), a Qatari self-managed community-based health ... -
Appetite and gut hormone responses to moderate-intensity continuous exercise versus high-intensity interval exercise, in normoxic and hypoxic conditions
Bailey, Daniel P.; Smith, Lindsey R.; Chrismas, Bryna C.; Taylor, Lee; Stensel, David J.; Deighton, Kevin; Douglas, Jessica A.; Kerr, Catherine J.... more authors ... less authors ( Elsevier , 2015 , Article & Report)This study investigated the effects of continuous moderate-intensity exercise (MIE) and high-intensity interval exercise (HIIE) in combination with short exposure to hypoxia on appetite and plasma concentrations of acylated ... -
Breaking up prolonged sitting time with walking does not affect appetite or gut hormone concentrations but does induce an energy deficit and suppresses postprandial glycaemia in sedentary adults
Bailey, Daniel P.; Broom, David R.; Chrismas, Bryna C.R.; Taylor, Lee; Flynn, Edward; Hough, John... more authors ... less authors ( NRC Research Press , 2016 , Article)Background: Breaking up periods of prolonged sitting can negate harmful metabolic effects but the influence on appetite and gut hormones is not understood and is investigated in this study. Methods: Thirteen sedentary (7 ... -
Breaking up prolonged sitting with moderate-intensity walking improves attention and executive function in Qatari females
Chrismas, Bryna C.R.; Taylor, Lee; Cherif, Anissa; Sayegh, Suzan; Bailey, Daniel P. ( Public Library of Science , 2019 , Article)Background Cultural, environmental and logistical factors promote a sedentary lifestyle within Qatar, particularly for females. Sedentary behaviour is acutely associated with poor cognitive function and fatigue, and ... -
Caffeine Supplementation as an Ergogenic Aid for Muscular Strength and Endurance: A Recommendation for Coaches and Athletes
Brooks, Joseph H.; Wyld, Kevin; Chrismas, Bryna C.R. ( SciTechnol , 2016 , Article)Caffeine (1, 3, 7-trimethylxanthine) which can be ubiquitously found in energy drinks, sodas, coffee, and supplements, is one of the principal legal drugs consumed worldwide. Caffeine based ergogenic aids are utilized ... -
Changes in core temperature during an elite female rugby sevens tournament
Henderson, Mitchell J.; Chrismas, Bryna C.R.; Stevens, Christopher J.; Coutts, Aaron J.; Taylor, Lee ( Human Kinetics Publishers Inc. , 2020 , Article)Purpose: To characterize player core temperature (Tc) across a World Rugby Women's Sevens Series tournament day (WRWSS) and determine the efficacy of commonly employed cold-water-immersion (CWI) protocols. Methods: Tc was ... -
Core Body Temperatures in Intermittent Sports: A Systematic Review
Henderson, Mitchell J.; Grandou, Clementine; Chrismas, Bryna C.R.; Coutts, Aaron J.; Impellizzeri, Franco M.; Taylor, Lee... more authors ... less authors ( Springer Nature , 2023 , Article)Background: Hyperthermia (and associated health and performance implications) can be a significant problem for athletes and teams involved in intermittent sports. Quantifying the highest thermal strain (i.e. peak core body ... -
Hypoxic Air Inhalation and Ischemia Interventions Both Elicit Preconditioning Which Attenuate Subsequent Cellular Stress In vivo Following Blood Flow Occlusion and Reperfusion.
Barrington, James H; Chrismas, Bryna C R; Gibson, Oliver R; Tuttle, James; Pegrum, J; Govilkar, S; Kabir, Chindu; Giannakakis, N; Rayan, F; Okasheh, Z; Sanaullah, A; Ng Man Sun, S; Pearce, Oliver; Taylor, Lee... more authors ... less authors ( Frontiers Media , 2017 , Article)Ischemic preconditioning (IPC) is valid technique which elicits reductions in femoral blood flow occlusion mediated reperfusion stress (oxidative stress, Hsp gene transcripts) within the systemic blood circulation and/or ... -
The Importance of Monitoring Sleep within Adolescent Athletes: Athletic, Academic, and Health Considerations
Taylor, Lee; Chrismas, Bryna C.R.; Dascombe, Ben; Chamari, Karim; Fowler, Peter M. ( Frontiers Media , 2016 , Article)Opinion piece. -
The influence of environmental and core temperature on cyclooxygenase and PGE2 in healthy humans
Esh, Christopher J.; Chrismas, Bryna C.R.; Mauger, Alexis R.; Cherif, Anissa; Molphy, John; Taylor, Lee... more authors ... less authors ( Springer Nature , 2021 , Article)Whether cyclooxygenase (COX)/prostaglandin E2 (PGE2) thermoregulatory pathways, observed in rodents, present in humans? Participants (n = 9) were exposed to three environments; cold (20 °C), thermoneutral (30 °C) and hot ... -
Limiting Rise in Heat Load With an Ice Vest During Elite Female Rugby Sevens Warm-Ups
Henderson, Mitchell J.; Chrismas, Bryna C.R.; Stevens, Christopher J.; Fransen, Job; Coutts, Aaron J.; Taylor, Lee... more authors ... less authors ( Human Kinetics Publishers Inc. , 2021 , Article)Purpose: To determine the effect of wearing a phase-change cooling vest in elite female rugby sevens athletes during (1) a simulated match-day warm-up in hot conditions prior to a training session and (2) a prematch warm-up ... -
Limiting the Rise in Core Temperature During a Rugby Sevens Warm-up With an Ice Vest.
Taylor, Lee; Stevens, Christopher J; Thornton, Heidi R; Poulos, Nick; Chrismas, Bryna C R ( Human Kinetics , 2019 , Article)Determine how a cooling vest worn during a warm-up could influence selected performance [counter movement jump (CMJ)], physical (GPS metrics) and psycho-physiological (body temperature and perceptual) variables. In a ... -
Pharmacological hypotheses: Is acetaminophen selective in its cyclooxygenase inhibition?
Esh, Christopher J.; Chrismas, Bryna C.R.; Mauger, Alexis R.; Taylor, Lee ( Wiley-Blackwell , 2021 , Article)The precise mechanistic action of acetaminophen (ACT; paracetamol) remains debated. ACT’s analgesic and antipyretic actions are attributed to cyclooxygenase (COX) inhibition preventing prostaglandin (PG) synthesis. Two COX ... -
Physical fitness and physical self-concept of male and female young adults in Qatar
Chrismas, Bryna C. R.; Majed, Lina; Kneffel, Zsuzsanna ( Public Library of Science , 2019 , Article)Background Physical inactivity is high within the Qatari population, particularly within females, and school-based environments, contributing to increased morbidity and mortality. School-based physical activity (PA) outcomes ... -
Postprandial insulin and triglyceride concentrations are suppressed in response to breaking up prolonged sitting in Qatari females
Chrismas, Bryna C.R.; Taylor, Lee; Cherif, Anissa; Sayegh, Suzan; Rizk, Nasser; El-Gamal, Abdelrahman; Allenjawi, Salwa Hassan; Bailey, Daniel P.... more authors ... less authors ( Frontiers Media S.A. , 2019 , Article)Background: Cultural, environmental and logistical factors challenge the Qatari population, particularly females, to engage in physical activity, and there is a high prevalence of diabetes in this population. Sedentary ... -
A Reduction in Maximal Incremental Exercise Test Duration 48 h Post Downhill Run Is Associated with Muscle Damage Derived Exercise Induced Pain.
Chrismas, Bryna C R; Taylor, Lee; Siegler, Jason C; Midgley, Adrian W ( Frontiers Media , 2017 , Article)Purpose: To examine whether exercise induced muscle damage (EIMD) and muscle soreness reduce treadmill maximal incremental exercise (MIE) test duration, and true maximal physiological performance as a consequence of exercise ... -
Responses to a 5-Day Sport-Specific Heat Acclimatization Camp in Elite Female Rugby Sevens Athletes
Henderson, Mitchell J.; Chrismas, Bryna C.R.; Fransen, Job; Coutts, Aaron J.; Taylor, Lee ( Human Kinetics Publishers Inc. , 2022 , Article)Purpose: To describe the physiological (resting core temperature, exercising heart rate, and sweat rate) and psychophysical (rating of perceived exertion, thermal sensation, and thermal comfort) responses to a short-term ... -
Sleep Medication and Athletic Performance—The Evidence for Practitioners and Future Research Directions
Taylor, Lee; Chrismas, Bryna C.R.; Dascombe, Ben; Chamari, Karim; Fowler, Peter M. ( Frontiers Media , 2016 , Article)Opinion piece. -
The Hsp72 and Hsp90a mRNA responses to hot downhill running are reduced following a prior bout of hot downhill running, and occur concurrently within leukocytes and the vastus lateralis
Tuttle, James A.; Chrismas, Bryna C. R.; Gibson, Oliver R.; Barrington, James H.; Hughes, David C.; Castle, Paul C.; Metcalfe, Alan J.; Midgley, Adrian W.; Pearce, Oliver; Kabir, Chindu; Rayanmarakar, Faizal; Al-Ali, Sami; Lewis, Mark P.; Taylor, Lee... more authors ... less authors ( Frontiers Media S.A. , 2017 , Article)The leukocyte heat shock response (HSR) is used to determine individual's thermotolerance. The HSR and thermotolerance are enhanced following interventions such as preconditioning and/or acclimation/acclimatization. However, ...