The influence of water versus carbohydrate-electrolyte hydration on blood components during a 16-km military march.

The purpose of this study was to identify and to compare the effects of ingesting liquids during a 16-km military march under moderate environmental conditions. Twenty-six volunteer male subjects were randomly divided into two groups. Group GW received water (n=12), and group GP received an electrolytic carbohydrate solution (n=14). Blood and urine samples were obtained [...]

By |2013-01-31T18:32:29+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Hydration effects on thermoregulation and performance in the heat.

During exercise, sweat output often exceeds water intake, producing a water deficit or hypohydration. The water deficit lowers both intracellular and extracellular fluid volumes, and causes a hypotonic-hypovolemia of the blood. Aerobic exercise tasks are likely to be adversely effected by hypohydration (even in the absence of heat strain), with the potential affect being greater [...]

By |2013-01-31T18:32:29+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Hydration in the marathon : using thirst to gauge safe fluid replacement.

Early human ancestors evolved hunting in the midday heat on the dry African savannah and developed favourable biological adaptations that permit prolonged running in the heat. These physiological adaptations must have included the capacity to sweat profusely to maintain a low body temperature when running for 4-6 hours in dry heat, an absence of adverse [...]

By |2013-01-31T18:32:29+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Effect of dehydration on gastrointestinal function at rest and during exercise in humans

Dehydration leads to the aggravation of gastrointestinal (GI) complaints during exercise. The aim of this study was to examine the effect of dehydration on various GI parameters during strenuous exercise. Ten healthy well-trained men were investigated in dehydrated and in euhydrated conditions. Dehydration took place before the experiments using a dehydration regimen in a sauna [...]

By |2013-01-31T18:32:28+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Work performance after dehydration: effects of physical conditioning and heat acclimatization. 1958.

Three groups of five men each were dehydrated overnight in the heat (115 degrees F) on two occasions (D1 and D2) to approximately 5.5% of their starting body weight. During the 3-week period between D1 and D2, one group (AC) was acclimatized to heat and physically conditioned, the second group (C) was physically conditioned and [...]

By |2013-01-31T18:32:28+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Effects of dehydration on exercise performance.

Dehydration refers both to hypohydration (dehydration induced prior to exercise) and to exercise-induced dehydration (dehydration that develops during exercise). The latter reduces aerobic endurance performance and results in increased body temperature, heart rate, perceived exertion, and possibly increased reliance on carbohydrate as a fuel source. Although the negative effects of exercise-induced dehydration on exercise performance [...]

By |2013-01-31T18:32:28+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Separate and combined influences of dehydration and hyperthermia on cardiovascular responses to exercise.

During endurance exercise in the heat athletes lose 1-21/h of fluid due to thermoregulatory sweating. The ensuing dehydration is accompanied by higher and faster increases in core temperature, which per se can cause fatigue. The main cardiovascular consequences of combined dehydration and hyperthermia [1 degree C higher core temperature and 3-4 kg (4%) body weight [...]

By |2013-01-31T18:32:28+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

Effects of dehydration on isometric muscular strength and endurance.

To examine the effects of rapid dehydration on isometric muscular strength and endurance, seven men were tested at baseline (control) and after a dehydration (dHST) and a euhydration (eHST) heat stress trial. The dHST consisted of intermittent sauna exposure until 4% of body mass was lost, whereas the eHST consisted of intermittent sauna exposure (same [...]

By |2013-01-31T18:32:28+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments

The importance of good hydration for work and exercise performance.

This review covers published literature on the influence of whole-body hydration status on exercise performance. The majority of information in this area relates to endurance exercise performance, but information on power, strength, and sporting skills has also been investigated. These areas form the focus of the current review. It is apparent that some individuals can [...]

By |2013-01-31T18:32:28+00:00enero 31st, 2013|Exercise and sport, Scientific papers|0 Comments