A5023514432- Muscle metabolism and nutrition
- Thermoregulation and physiological responses
- Sports Performance and Training
- Cardiovascular and exercise physiology
- Exercise and Physiological Responses
- Diet and metabolism studies
- Obesity, Physical Activity, Diet
- Physical Activity and Health
- High Altitude and Hypoxia
- Sports injuries and prevention
- Electrolyte and hormonal disorders
- Urban Transport and Accessibility
- Adipose Tissue and Metabolism
- Nutritional Studies and Diet
- Hemoglobinopathies and Related Disorders
- Diabetes, Cardiovascular Risks, and Lipoproteins
- Heart Rate Variability and Autonomic Control
- Cardiovascular and Diving-Related Complications
- Diet, Metabolism, and Disease
- Body Composition Measurement Techniques
- Neuroscience of respiration and sleep
- Heat Transfer and Optimization
- Sodium Intake and Health
- Occupational Health and Performance
- Lipid metabolism and disorders
University of Otago
2015-2025
University of Missouri
2010
University of Auckland
2010
Colorado State University
2010
Gettysburg College
2008
Queen Mary University of London
2008
Unité de Nutrition Humaine
2007
Canadian Sport Centre Pacific
2006
University of New Brunswick
2006
Dalhousie University
2006
The aim of this study was to quantify the movement patterns various playing positions during professional rugby union match-play, such that relative importance aerobic and anaerobic energy pathways performance could be estimated. Video analysis conducted individual players (n=29) from Otago Highlanders six "Super 12" representative fixtures. Each coded as one speeds locomotion (standing still, walking, jogging, cruising, sprinting, utility), three states non-running intensive exertion...
INTRODUCTION The Second International Exercise-Associated Hyponatremia (EAH) Consensus Development Conference convened in Queenstown, New Zealand (November 2007) with a panel of eighteen international experts. This conference utilized the United States National Institute Health (NIH) protocol and was deliberately free from commercial sponsorship. delegates represented seven countries eight medical scientific sub-specialties pertaining to exercise physiology, sports medicine, water...
INTRODUCTION The third International Exercise-Associated Hyponatremia (EAH) Consensus Development Conference convened in Carlsbad, California February 2015 with a panel of 17 international experts. delegates represented 4 countries and 9 medical scientific sub-specialties pertaining to athletic training, exercise physiology, sports medicine, water/sodium metabolism, body fluid homeostasis. primary goal the was review existing data on EAH update 2008 Statement.1 This document serves replace...
The 3rd International Exercise-Associated Hyponatremia (EAH) Consensus Development Conference convened in Carlsbad, California, February 2015, with a panel of 17 international experts. delegates represented four countries and nine medical scientific subspecialties pertaining to athletic training, exercise physiology, sports medicine, water/sodium metabolism body fluid homoeostasis. primary goal the was review existing data on EAH update 2008 Statement.1 This document serves replace 2nd...
ABSTRACT Most heat acclimation data are from regimes longer than 1 week, and advice is to prevent dehydration. Objectives: We hypothesized that (i) short‐term (5‐day) would substantially improve physiological strain exercise tolerance under stress, (ii) dehydration provide a thermally independent stimulus for adaptation. Methods: Nine aerobically fit males acclimated using controlled‐hyperthermia (rectal temperature 38.5°C) 90 min on 5 days; once euhydrated (EUH) dehydrated (DEH) during...
This study explored the relationship between physical activity (PA) environment, nature affinity and wellbeing. An online survey was used incorporating Nature-Relatedness Scale (NR-6), EQ-5D health questionnaire, WHO-5 wellbeing questionnaire International Physical Activity Questionnaire-Short Form (IPAQ-SF), with additional questions on PA environment connection to place (n = 179). Statistical analyses were conducted using generalised linear mixed effects quantile regression. in correlated...
This study assessed whether replacing sweat losses with sodium-free fluid can lower the plasma sodium concentration and thereby precipitate development of hyponatremia. Ten male endurance athletes participated in one 1-h exercise pretrial to estimate needs two 3-h experimental trials on a cycle ergometer at 55% maximum O2 consumption 34 degrees C 65% relative humidity. In trials, loss was replaced by distilled water (W) or sodium-containing (18 mmol/l) sports drink, Gatorade (G). Six...
NOAKES, T. D., N. J. REHRER, and R. MAUGHAN. The importance of volume in regulating gastric emptying. Med. Sci. Sports Exerc., Vol. 23, No. 3, pp. 307–313, 1991. There is now substantive evidence that the provision exogenous carbohydrate at high rates (1–2 g.min-1) can enhance performance during prolonged exercise. This finding has revived research into factors determining rate delivery While muscle oxidation could be determined by emptying or intestinal absorption glucose uptake oxidation,...
This study examined the relationship between gastrointestinal (GI) symptoms and dietary intake in triathletes. Fifty-five male triathletes (age 31 ±6 yrs) were surveyed regarding most recently completed half Iron Man triathlon. Questions asked GI intake. Fifty-two percent complained of eructation 48% flatulence. Other abdominal bloating, vomiting urge, vomiting, nausea, stomachache, intestinal cramps, diarrhea. More occurred while running than at other times. All individuals who had eaten...
This study was designed to examine aspects of digestive function that may limit assimilation water and oxidation orally ingested carbohydrate (CHO) during exercise. Eight males completed a crossover in which each cycled on four occasions for 80 min at 70% maximal O2 consumption. Beverage consumed 0, 20, 40, 60 min. Beverages were water, 4.5% glucose (4.5G), 17% (17G), maltodextrin (17MD). CHO beverages contained 20 meq/l NaCl 13C enriched measure exogenous oxidation. Gastric (beverage)...
Gastrointestinal distress is commonly reported by athletes after ingestion of a beverage. We speculate that may be occurring dehydration has taken place. The high prevalence GI disorders in marathon runners who have lost ≥4% body weight supports this theory. To test theory, the effects dehydration, and combination with endurance running, on gastric emptying (GE) frequency gastrointestinal (GI) complaints were tested experiment. A complete crossover study was designed. Sixteen subjects...
A group of 114 previously untrained subjects, 31 females and 83 males, was followed for 18 months while training a marathon. Forty-four the subjects completed survey regarding fluid intakes gastrointestinal (GI) disturbances during competition both their first 25-km race (run after 1 year training) GI problems were common. Among individuals surveyed, 25% had complaints in race. In marathon, 52% complained distress. general, consumption low (25 km means = 109 ml; marathon w 577 ml). Body...
The high prevalence of gastrointestinal complaints in long-distance runners makes the movements specific to this type exercise suspected causing a disruption normal function. Gastric emptying rate is one indicator thereof. In present study trained volunteers performed similar repeated fluid ingestion tests while running and bicycling for 80 min at 70% VO2max. Control rest were also conducted. Two drinks containing carbohydrate tested, hypertonic, isotonic. Artificially sweetened water was...
REHRER, N. J., E. BECKERS, F. BROUNS, TEN HOOR, and W. H. M. SARIS. Exercise training effects on gastric emptying of carbohydrate beverages. Med. Sci. Sports Exerc., Vol. 21, No. 5, pp. 540–549, 1989. Carbohydrate containing drinks are commonly consumed as an ergogenic aid during endurance sports activities. The efficacy a given drink is limited by the rate absorption, which in turn emptying. A myriad factors influence several these (training status, exercise intensity, composition) was...
Purpose: This study was conducted to determine whether preexercise ingestion of a highly concentrated sodium beverage would increase plasma volume (PV) and reduce the physiological strain moderately trained males running in heat. Methods: Eight endurance-trained (V˙O2max: 58 mL·kg−1·min−1 (SD 5); 36 yr 11)) runners completed this double-blind, crossover experiment. Runners ingested high-sodium (High Na+: 164 mmol Na+·L−1) or low-sodium (Low 10 (10 mL·kg−1) before exhaustion at 70% V˙O2max...
This study was conducted during the high-hormone phase of both natural and oral contraceptive pill (OCP)-mediated menstrual cycles to determine whether preexercise ingestion a concentrated sodium beverage would increase plasma volume (PV), reduce physiological strain, aid endurance moderately trained women cycling in warm conditions. Thirteen cyclists [peak O(2) uptake 52 ml x kg(-1) min(-1) (SD 2), age 26 yr 6), weight 60.8 kg 5)] who were users (n = 6) or not 7) completed this...