Thermal and circulatory responses during exercise: effects of hypohydration, dehydration, and water intake

DOI Web Site 被引用文献1件
  • Lawrence E. Armstrong
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • Carl M. Maresh
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • Catherine V. Gabaree
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • Jay R. Hoffman
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • Stavros A. Kavouras
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • Robert W. Kenefick
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • John W. Castellani
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110
  • Lynn E. Ahlquist
    Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110

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<jats:p> Armstrong, Lawrence E., Carl M. Maresh, Catherine V. Gabaree, Jay R. Hoffman, Stavros A. Kavouras, Robert W. Kenefick, John W. Castellani, and Lynn E. Ahlquist. Thermal and circulatory responses during exercise: effects of hypohydration, dehydration, and water intake. J. Appl. Physiol. 82(6): 2028–2035, 1997.—This investigation examined the distinct and interactive effects of initial hydration state, exercise-induced dehydration, and water rehydration in a hot environment. On four occasions, 10 men performed a 90-min heat stress test (treadmill walking at 5.6 km/h, 5% grade, 33°C, 56% relative humidity). These heat stress tests differed in pretest hydration [2 euhydrated (EU) and 2 hypohydrated (HY) trials] and water intake during exercise [2 water ad libitum (W) and 2 no water (NW) trials]. HY + NW indicated greater physiological strain than all other trials ( P < 0.05–0.001) in heart rate, plasma osmolality (P<jats:sub>osm</jats:sub>), sweat sensitivity (g / °C ⋅ min), and rectal temperature. Unexpectedly, final HY + W and EU + W responses for rectal temperature, heart rate, and P<jats:sub>osm</jats:sub> were similar, despite the initial 3.9 ± 0.2% hypohydration in HY + W. We concluded that differences in pretest P<jats:sub>osm</jats:sub> (295 ± 7 and 287 ± 5 mosmol/kg for HY + W and EU + W, respectively) resulted in greater water consumption (1.65 and 0.31 liter for HY + W and EU + W, respectively), no voluntary dehydration (0.9% body mass increase), and attenuated thermal and circulatory strain during HY + W. </jats:p>

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