| Skin Temperature Modifies the Impact of Hypohydration on Aerobic Performance |
Jul 2010 |
9 pages |
| Authors:
Robert W Kenefick; S N Cheuvront; L J Palombo; B R Ely; M N Sawka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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 | This study determined the effects of hypohydration on aerobic performance in compensable [evaporative cooling requirement (Ereq) equal less than maximal evaporative cooling (Emax)] conditions of 10 deg C [7 deg C wet bulb globe temperature (WBGT)] 20 deg C (16 deg C WBGT), 30 deg C (22 deg C WBGT), and 40 deg C (27 deg C WBGT) ambient temperature (Ta). Our hypothesis was that 4% hypohydration would impair aerobic ... |
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| Expanded Prediction Equations of Human Sweat Loss and Water Needs |
Jan 2009 |
11 pages |
| Authors:
R R Gonzalez; S N Cheuvront; S J Montain; D A Goodman; L A Blanchard; L G Berglund; M N Sawka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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| The Institute of Medicine expressed a need for improved sweating rate (m'sw) prediction models that calculate hourly and daily water needs based on metabolic rate, clothing, and environment. More than 25 years ago, the original Shapiro prediction equation (OSE) was formulated as m'sw (g*m-2*h-11) +27.9 Ereq*(Emax-)0.455, where Ereq is required evaporative heat loss and Emax is maximum evaporative power of the environment; OSE was developed for a limited set of ... |
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| No Effect of Nutritional Adenosine Receptor Antagonists on Exercise Performance in the Heat |
Nov-2008 |
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| Authors:
S N Cheuvront; B R Ely; R W Kenefick; B B Michniak-Kohn; J C Rood; M N Sawka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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 | Nutritional adenosine receptor antagonists can enhance endurance exercise performance in temperate environments, but their efficacy during heat stress is not well understood. This double-blinded, placebo-controlled study compared the effects of an acute dose of caffeine or quercetin on endurance exercise performance during compensable heat stress (40 C, 20-30% rh). On each of three occasions, 10 healthy men each performed 30-min of cycle ergometry at 50% Vo2peak followed by a 15-min ... |
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| Effect of Increased Plasma Osmolality on Cold-Induced Thirst Attenuation |
Aug 2008 |
8 pages |
| Authors:
Robert W St Kenefick; A Pierre; N A Riel; S N Cheuvront; J W Castellani; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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| The effects of elevating plasma osmolality (Posm) on thirst ratings was studies in eight dehydrated males during exposure to 4 deg C. On two occasions, subjects were dehydrated (DH; 3-4% body mass) via 90 min exercise-heat exposure and overnight fluid restriction (day 1). On a third occasion, subjects were exposed to heat but were given fluid (EU). |
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