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

Lawrence E. Armstrong, Carl M. Maresh, Catherine V. Gabaree, Jay R. Hoffman, Stavros A. Kavouras, Robert W. Kenefick, John W. Castellani, Lynn E. Ahlquist

Research output: Contribution to journalArticle

139 Citations (Scopus)

Abstract

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(osm)), sweat sensitivity (g/°C · min), and rectal temperature. Unexpectedly, final HY + W and EU + W responses for rectal temperature, heart rate, and P(osm) were similar, despite the initial 3.9 ± 0.2% hypohydration in HY + W. We concluded that differences in pretest P(osm) (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.

Original languageEnglish (US)
Pages (from-to)2028-2035
Number of pages8
JournalJournal of Applied Physiology
Volume82
Issue number6
DOIs
StatePublished - Jun 1997
Externally publishedYes

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Dehydration
Drinking
Hot Temperature
Exercise
Water
Exercise Test
Heart Rate
Temperature
Sweat
Fluid Therapy
Humidity
Osmolar Concentration
Walking

Keywords

  • Body temperature
  • Fluid shifts
  • Plasma
  • Rehydration
  • Temperature regulation

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Armstrong, L. E., Maresh, C. M., Gabaree, C. V., Hoffman, J. R., Kavouras, S. A., Kenefick, R. W., ... Ahlquist, L. E. (1997). Thermal and circulatory responses during exercise: Effects of hypohydration, dehydration, and water intake. Journal of Applied Physiology, 82(6), 2028-2035. https://doi.org/10.1152/jappl.1997.82.6.2028

Thermal and circulatory responses during exercise : Effects of hypohydration, dehydration, and water intake. / Armstrong, Lawrence E.; Maresh, Carl M.; Gabaree, Catherine V.; Hoffman, Jay R.; Kavouras, Stavros A.; Kenefick, Robert W.; Castellani, John W.; Ahlquist, Lynn E.

In: Journal of Applied Physiology, Vol. 82, No. 6, 06.1997, p. 2028-2035.

Research output: Contribution to journalArticle

Armstrong, LE, Maresh, CM, Gabaree, CV, Hoffman, JR, Kavouras, SA, Kenefick, RW, Castellani, JW & Ahlquist, LE 1997, 'Thermal and circulatory responses during exercise: Effects of hypohydration, dehydration, and water intake', Journal of Applied Physiology, vol. 82, no. 6, pp. 2028-2035. https://doi.org/10.1152/jappl.1997.82.6.2028
Armstrong, Lawrence E. ; Maresh, Carl M. ; Gabaree, Catherine V. ; Hoffman, Jay R. ; Kavouras, Stavros A. ; Kenefick, Robert W. ; Castellani, John W. ; Ahlquist, Lynn E. / Thermal and circulatory responses during exercise : Effects of hypohydration, dehydration, and water intake. In: Journal of Applied Physiology. 1997 ; Vol. 82, No. 6. pp. 2028-2035.
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