Co-Authors:
Taylor, C.R., Mus. Comp. Zool., Harvard Univ., Cambridge, Mass. 02138, United States
Dmi'el, R., Mus. Comp. Zool., Harvard Univ., Cambridge, Mass. 02138, United States
Shkolnik, A., Mus. Comp. Zool., Harvard Univ., Cambridge, Mass. 02138, United States
Baharav, D.
Borut, A.
Abstract:
The effect of exercise was studied on the water balance of desert gazelles. The higher metabolism of exercising animals will increase the amount of water available both from oxidation and from free water in food. These higher intakes could result in a net gain of water if the heat generated by exercise was lost mainly by nonevaporative means or a net loss if relatively more of this heat were lost by evaporation. Measurements were made of the amount of heat lost by evaporation, nonevaporative means, and the amount stored as animals rested at various air temperatures and ran at various speeds. The same proportion of the heat production was lost by evaporation at 3 km/hr as at rest, whereas 30-40% more of the heat produced while running at 6-9.5 km/hr was lost by evaporation. At speeds exceeding 15 km/hr, most of the heat produced was stored. However, when the recovery period after a sprint was included (while body temperature returned to normal levels), the same proportion of the heat production was lost by evaporation as at rest. Since gazelles normally either move slowly as they graze or sprint to avoid predators, it seems reasonable to conclude that exercise would not have a major effect on their water balance.
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