EFFECTS OF FLUID INGESTION ON COGNITIVE FUNCTION AFTER HEAT STRESS OR EXERCISE-INDUCED DEHYDRATION

This study investigated the effects of heat exposure, exercise-induced dehydration and fluid ingestion on cognitive performance. Seven healthy men, unacclimatized to heat, were kept euhydrated or were dehydrated by controlled passive exposure to heat (H, two sessions) or by treadmill exercise (E, two sessions) up to a weight loss of 2.8%. On completion of a [...]

By |2013-01-31T18:34:07+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

ESTIMATION OF PREPRACTICE HYDRATION STATUS OF NATIONAL COLLEGIATE ATHLETIC ASSOCIATION DIVISION I ATHLETES.

ONTEXT: To our knowledge, no one has compared the prepractice hydration status of male and female National Collegiate Athletic Association (NCAA) Division I athletes or has studied the effects of the menstrual cycle phase on women's prepractice hydration status. OBJECTIVE: To report prepractice hydration status of collegiate athletes and determine the factors that might influence [...]

By |2013-01-31T18:34:07+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

HYDRATION AND THE PHYSIOLOGICAL RESPONSES TO ACUTE NORMOBARIC HYPOXIA

OBJECTIVE: The effect hydration status has on exposure to hypoxia is unclear. The purpose of the study was to identify how hydration status, above and below euhydrated levels, affects the physiological responses and onset of acute mountain sickness symptoms during acute normobaric hypoxia. METHODS: Eight males completed intermittent walking tests under normobaric hypoxic conditions (FIo2 [...]

By |2013-01-31T18:34:07+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

HYDRATION STATUS, SWEAT RATES, AND REHYDRATION EDUCATION OF YOUTH FOOTBALL CAMPERS.

CONTEXT: Previous field research has not identified sweat rates (SR), fluid consumption (FC), or the efficacy of an educational intervention (EI) for youth during football camp. OBJECTIVE: To measure hydration status and rehydration performance and examine EL using these data. DESIGN: Observational with EI randomized comparison. PARTICIPANTS: Thirty-three boys (mean +/- SD: 12 +/- 2 [...]

By |2013-01-31T18:34:07+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

CARBOHYDRATE EXERTS A MILD INFLUENCE ON FLUID RETENTION FOLLOWING EXERCISE-INDUCED DEHYDRATION.

Rapid and complete rehydration, or restoration of fluid spaces, is important when acute illness or excessive sweating has compromised hydration status. Many studies have investigated the effects of graded concentrations of sodium and other electrolytes in rehydration solutions; however, no study to date has determined the effect of carbohydrate on fluid retention when electrolyte concentrations [...]

By |2013-01-31T18:34:07+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

NATIONAL ATHLETIC TRAINERSA’ ASSOCIATION POSITION STATEMENT: FLUID REPLACEMENT FOR ATHLETES

OBJECTIVE: To present recommendations to optimize the fluid-replacement practices of athletes. BACKGROUND: Dehydration can compromise athletic performance and increase the risk of exertional heat injury. Athletes do not voluntarily drink sufficient water to prevent dehydration during physical activity. Drinking behavior can be modified by education, increasing accessibility, and optimizing palatability. However, excessive overdrinking should be [...]

By |2013-01-31T18:34:06+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

FLUID BALANCE AND ENDURANCE EXERCISE PERFORMANCE

Dehydration alters cardiovascular, thermoregulatory, central nervous system, and metabolic functions. One or more of these alterations will degrade endurance exercise performance when dehydration exceeds 2% of body weight. These performance decrements are accentuated by heat stress. To minimize the adverse consequences of body water deficits on endurance exercise performance, it is recommended that fluid intake [...]

By |2013-01-31T18:34:06+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

DEHYDRATION MARKEDLY IMPAIRS CARDIOVASCULAR FUNCTION IN HYPERTHERMIC ENDURANCE ATHLETES DURING EXERCISE

We identified the cardiovascular stress encountered by superimposing dehydration on hyperthermia during exercise in the heat and the mechanisms contributing to the dehydration-mediated stroke volume (SV) reduction. Fifteen endurance-trained cyclists [maximal O2 consumption (VO2max) = 4.5 l/min] exercised in the heat for 100-120 min and either became dehydrated by 4% body weight or remained euhydrated [...]

By |2013-01-31T18:34:06+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

COMPARISON OF WATER TURNOVER RATES IN MEN UNDERTAKING PROLONGED CYCLING EXERCISE AND SEDENTARY MEN

Total body water (TBW) and water turnover rates (WTR) of six competitive male cyclists (CG) and six age-matched sedentary men (SG) were determined using deuterium oxide dilution and elimination. During the 7 day study, individuals in the CG cycled daily outside on average 50 (range 12-146) km at an average speed of 29 km.h(-1), while [...]

By |2013-01-31T18:34:06+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments