Tags

Type your tag names separated by a space and hit enter

Physiological consequences of hypohydration: exercise performance and thermoregulation.
Med Sci Sports Exerc. 1992 Jun; 24(6):657-70.MS

Abstract

During exercise in the heat, sweat output often exceeds water intake, which results in a body water deficit or hypohydration. This water deficit occurs from both the intracellular and extracellular fluid compartments, and causes a hypertonic-hypovolemia of the blood. Aerobic exercise tasks are likely to be adversely affected by hypohydration; and the warmer the environment the greater the potential for performance decrements. Hypohydration causes greater heat storage and reduces one's ability to tolerate heat strain. The greater heat storage is mediated by reduced sweating rate (evaporative heat loss) and reduced skin blood flow (dry heat loss) for a given core temperature. Reductions of sweating rate and skin blood flow are most tightly coupled to blood hypertonicity and hypovolemia, respectively. In addition, hypovolemia and the displacement of blood to the skin make it difficult to maintain central venous pressure and thus an adequate cardiac output to simultaneously support metabolism and thermoregulation during exercise-heat stress.

Authors+Show Affiliations

U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760-5007.

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

1602938

Citation

Sawka, M N.. "Physiological Consequences of Hypohydration: Exercise Performance and Thermoregulation." Medicine and Science in Sports and Exercise, vol. 24, no. 6, 1992, pp. 657-70.
Sawka MN. Physiological consequences of hypohydration: exercise performance and thermoregulation. Med Sci Sports Exerc. 1992;24(6):657-70.
Sawka, M. N. (1992). Physiological consequences of hypohydration: exercise performance and thermoregulation. Medicine and Science in Sports and Exercise, 24(6), 657-70.
Sawka MN. Physiological Consequences of Hypohydration: Exercise Performance and Thermoregulation. Med Sci Sports Exerc. 1992;24(6):657-70. PubMed PMID: 1602938.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Physiological consequences of hypohydration: exercise performance and thermoregulation. A1 - Sawka,M N, PY - 1992/6/1/pubmed PY - 1992/6/1/medline PY - 1992/6/1/entrez SP - 657 EP - 70 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 24 IS - 6 N2 - During exercise in the heat, sweat output often exceeds water intake, which results in a body water deficit or hypohydration. This water deficit occurs from both the intracellular and extracellular fluid compartments, and causes a hypertonic-hypovolemia of the blood. Aerobic exercise tasks are likely to be adversely affected by hypohydration; and the warmer the environment the greater the potential for performance decrements. Hypohydration causes greater heat storage and reduces one's ability to tolerate heat strain. The greater heat storage is mediated by reduced sweating rate (evaporative heat loss) and reduced skin blood flow (dry heat loss) for a given core temperature. Reductions of sweating rate and skin blood flow are most tightly coupled to blood hypertonicity and hypovolemia, respectively. In addition, hypovolemia and the displacement of blood to the skin make it difficult to maintain central venous pressure and thus an adequate cardiac output to simultaneously support metabolism and thermoregulation during exercise-heat stress. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/1602938/Physiological_consequences_of_hypohydration:_exercise_performance_and_thermoregulation_ DB - PRIME DP - Unbound Medicine ER -