A5103114989- Thermoregulation and physiological responses
- Exercise and Physiological Responses
- Sports Performance and Training
- Climate Change and Health Impacts
- Infrared Thermography in Medicine
- Muscle metabolism and nutrition
- Body Composition Measurement Techniques
- Cardiovascular and exercise physiology
- Occupational Health and Performance
- Heart Rate Variability and Autonomic Control
- Thermal Regulation in Medicine
- High Altitude and Hypoxia
- Electrolyte and hormonal disorders
- Diet and metabolism studies
- Spaceflight effects on biology
- Renal function and acid-base balance
- Heat shock proteins research
- Neurological Disease Mechanisms and Treatments
- Sports, Gender, and Society
- Sleep and Work-Related Fatigue
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Non-Invasive Vital Sign Monitoring
- Textile materials and evaluations
- Ginkgo biloba and Cashew Applications
- Adipose Tissue and Metabolism
U.S. Army Research Institute of Environmental Medicine
2011-2020
United States Army
2011-2020
University of Florida
2016
Center for Environmental Health
2015
United States Department of the Army
2005-2015
University of Minnesota Medical Center
2006
American College of Surgeons
2004-2005
Florida State University
1999-2002
Objective: To present evidence-based recommendations that promote optimized fluid-maintenance practices for physically active individuals. Background: Both a lack of adequate fluid replacement (hypohydration) and excessive intake (hyperhydration) can compromise athletic performance increase health risks. Athletes need access to water prevent hypohydration during physical activity but must be aware the risks overdrinking hyponatremia. Drinking behavior modified by education, accessibility,...
Marathon running performance slows in warm weather conditions, but the quantitative impact of has not been established. Purpose: To quantify on marathon for different populations runners. Methods: results and data were obtained Boston, New York, Twin Cities, Grandma's, Richmond, Hartford, Vancouver Marathons 36, 29, 24, 23, 6, 12, 10 yr, respectively. The race broken into quartiles based wet-bulb globe temperature (Q1 5.1-10°C, Q2 10.1-15°C, Q3 15.1-20°C, Q4 20.1-25°C). Analysis top three...
Background: The development of symptomatic hyponatraemia consequent on participation in marathon and ultraendurance races has led to questions about its aetiology prevention. Objectives: To evaluate: ( a ) the assertion that sweat sodium losses cannot contribute during endurance exercise; b adequacy fluid replacement recommendations issued by International Marathon Medical Directors Association (IMMDA) for 42 km or longer; c effectiveness commercial sports drinks, compared with water,...
This study determined the effects of hypohydration on aerobic performance in compensable [evaporative cooling requirement (E(req)) < maximal evaporative (E(max))] conditions 10 degrees C [7 wet bulb globe temperature (WBGT)], 20 (16 WBGT), 30 (22 and 40 (27 WBGT) ambient (T(a)). Our hypothesis was that 4% would impair to a greater extent with increasing heat stress. Thirty-two men [22 +/- 4 yr old, 45 8 ml.kg(-1).min(-1) peak O(2) uptake (Vo(2 peak))] were divided into four matched cohorts...
Core temperature (CT) in combination with heart rate (HR) can be a good indicator of impending heat exhaustion for occupations involving exposure to heat, heavy workloads, and wearing protective clothing. However, continuously measuring CT an ambulatory environment is difficult. To address this problem we developed model estimate the time course using series HR measurements as leading Kalman filter. The was trained data from 17 volunteers engaged 24 h military field exercise (air...
This study compared the effects of hypohydration (HYP) on endurance exercise performance in temperate and cold air environments. On four occasions, six men two women (age = 24 ± 6 yr, height 170 cm, weight 72.9 11.1 kg, peak O 2 consumption 48 9 ml·kg −1 ·min ) were exposed to 3 h passive heat stress (45 °C) early morning with [euhydration (EUH)] or without (HYP; 3% body mass) fluid replacement. Later day, subjects sat a (2 (20 environment minimal clothing for 1 before performing 30 min...
The purpose of this study was to quantify the variability and stability 1st morning body mass (BM) fluctuations during daily exercise in heat while following traditional fluid intake guidance. Data from 65 men were examined retrospectively. BM monitored over 4 15 consecutive days. Group variation 0.51+/-0.20 kg. coefficient 0.66+/-0.24%, normally distributed, not related either absolute (r = 0.04) or number measurements 0.34). Three days resulted a similar estimate compared 6 9 d, although...
Warmer weather negatively impacts the finishing time of slower marathon (42.2 km) runners more than faster runners. How warmer runners' regulation effort (pacing) leading to decreased performance is poorly understood.To determine influence air temperature on pacing with differing abilities throughout marathon.Race results were obtained from three Japanese Women's championship marathons that included 5 km times, time, and corresponding conditions. A total 62 race years' outcomes analyzed...
Context: Uncertainty exists regarding the effect of sustained sweating on sweat mineral-element composition. Purpose: To determine multiple hours exercise-heat stress mineral concentrations. Methods: Seven heat-acclimated subjects (6 males, 1 female) completed 5 × 60 min treadmill exercise (1.56 m/s, 2% grade) with 20 rest between periods in 2 weather conditions (27 °C, 40% relative humidity, m/s and 35 30%, m/s). Sweat was collected from a sweat-collection pouch attached to upper back...
The induction of cellular acquired thermal tolerance (ATT) during heat acclimation (HA) in humans is not well described. This study determined whether exercise-HA modifies the human shock protein (HSP)72 and HSP90 responses changes are correlated with physiological adaptations to HA. Using a 10-day HA protocol comprising daily exercise (treadmill walking) hot environment (T(a) = 49 degrees C, 20% RH), we analyzed baseline ex vivo heat-induced expression HSP72 peripheral blood mononuclear...
Environmental heat stress degrades aerobic performance; however, little research has focused on performance when the selected task elicits modest elevations in core body temperature (<38.5 degrees C).To determine effect of environmental stress, with hyperthermia, and pacing strategies.After a 30-min cycling preload at 50% VO2peak, eight euhydrated men performed 15-min time trial cycle ergometer temperate (TEMP; 21 C, RH) hot (HOT; 40 25% environments. Core skin (Tc Tsk, respectively) HR were...