Effects of hydration state on exercise thermoregulation in goats

M. J.M. Nijland, M. A. Baker

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

In this study we asked how exercise affects sweating and panting and how dehydration affects exercise thermoregulation in goats. Six goats exercised (4.8 km/h, +10% slope) for 45 min at an ambient temperature of 35°C when hydrated and after 48 h without drinking water. Hematocrit (Hct), plasma protein concentration (PP), and plasma osmolality were elevated by dehydration (P ≤ 0.05). Hct and plasma osmolality increased further during exercise in hydrated and dehydrated animals (P ≤ 0.05), but PP rose only in hydrated goats (P ≤ 0.05). The increase in central blood temperature (T(bl)) during exercise was greater in dehydrated than in hydrated animals (P ≤ 0.001). Evaporation by panting (E(resp)) and sweating were linearly related to T(bl) during exercise. The relationship between E(resp) and T(bl) was not affected by dehydration, but dehydrated animals showed an increased T(bl) threshold for sweating. We postulate that the elevation in threshold for sweating may be due primarily to increased body fluid osmolality, and that hypovolemia may not play a significant role in the thermoregulatory adjustments to exercise in dehydrated goats.

Original languageEnglish (US)
Pages (from-to)R201-R205
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume263
Issue number1 32-1
DOIs
StatePublished - 1992
Externally publishedYes

Keywords

  • blood temperature
  • dehydration
  • respiratory evaporation
  • sweating

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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