Effect of hydration state on testosterone and cortisol responses to training-intensity exercise in collegiate runners.

Exercise intensity powerfully influences testosterone, cortisol, and testosterone : cortisol ratio (T:C) responses to endurance exercise. Hydration state may also modulate these hormones, and therefore may alter the anabolic/catabolic balance in response to endurance exercise and training. This study examined the effect of running intensity on testosterone, cortisol, and T : C when exercise was [...]

By |2013-01-31T18:33:09+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Control of thermoregulatory sweating is altered by hydration level and exercise intensity.

The purpose of this study was to examine the thermoregulatory sweating control parameters of threshold temperature and sensitivity to determine whether 1) these variables were altered by hypohydration level and exercise intensity and 2) these alterations, if present, were additive and independent. Nine heat-acclimated men completed a matrix of nine trials: three exercise intensities of [...]

By |2013-01-31T18:33:09+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Influence of hydration level and body fluids on exercise performance in the heat.

During exercise in the heat, sweat output often exceeds water intake, resulting in hypohydration, which is defined as a body fluid deficit. This fluid deficit is comprised of water loss from both the intracellular and extracellular fluid compartments. Hypohydration during exercise causes a greater heat storage and reduces endurance in comparison with euhydration levels. The [...]

By |2013-01-31T18:33:09+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Hydration and physical performance.

There is a rich scientific literature regarding hydration status and physical function that began in the late 1800s, although the relationship was likely apparent centuries before that. A decrease in body water from normal levels (often referred to as dehydration or hypohydration) provokes changes in cardiovascular, thermoregulatory, metabolic, and central nervous function that become increasingly [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Effective fluid replacement.

As a result of exercise-induced sweating, athletes and trained individuals can lose up to 3 L of fluid per hour. Fluid replacement is required to maintain hydration and allow the athlete to continue to perform. Inadequate fluid intake will adversely affect temperature regulation, cardiovascular function, and muscle metabolism. To maximize fluid intake and effectively replace [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

American College of Sports Medicine position stand. Exercise and fluid replacement.

It is the position of the American College of Sports Medicine that adequate fluid replacement helps maintain hydration and, therefore, promotes the health, safety, and optimal physical performance of individuals participating in regular physical activity. This position statement is based on a comprehensive review and interpretation of scientific literature concerning the influence of fluid replacement [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Effects of three hydration beverages on exercise performance during 60 hours of heat exposure

Without adequate hydration, profound heat stress and dehydration can occur in people who work in hot environments. This study evaluated the effectiveness of three beverages on temperature regulation, cardiovascular response, and work performance during 60 h of dry heat exposure. Volunteer subjects lived in a climatic chamber in simulated desert conditions varying from 25-45 degrees [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Effect of hydration status on high-intensity rowing performance and immune function.

PURPOSE: This study determined the effect of dehydration and rehydration (DR) on performance, immune cell response, and tympanic temperature after high-intensity rowing exercise. METHODS: Seven oarswomen completed two simulated 2000-m rowing race trials separated by 72 h in a random, cross-over design. One trial was completed in a euhydrated (E) condition and the other using [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Development of individual hydration strategies for athletes.

Athletes are encouraged to begin exercise well hydrated and to consume sufficient amounts of appropriate fluids during exercise to limit water and salt deficits. Available evidence suggests that many athletes begin exercise already dehydrated to some degree, and although most fail to drink enough to match sweat losses, some drink too much and a few [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Conference on “Multidisciplinary approaches to nutritional problems”. Symposium on “Performance, exercise and health”. Hydration, fluids and performance.

Sweat evaporation can be a key thermoregulatory mechanism and it causes a loss of water from all compartments of the body. Hypohydration can also develop with restricted fluid intake or with intake of diuretics. Hypohydration can affect physical and/or mental performance and/or have implications for dietary recommendations. A variety of different types and modes of [...]

By |2013-01-31T18:33:08+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments