Effects of high environmental temperature and exercise on cardiorespiratory functions in ewe.

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The effects of high environmental temperature and exercise on cardiorespiratory functions were investigated in three Corriedale ewe. Measurements were made at rest, during walking on the treadmill (45m/min and 90m/min) and during the recovery at ambient temperatures of 18 and 33°C. The results obtained were as follows: 1. Heart rate, cardiac output and stroke volume were significantly (p≤0.01) greater at higher walking load (90m/min), but did not change significantly with a rise of ambient temperature. 2. Increase in the cardiac output during exercise was mainly due to an increase in the stroke volume. 3. At 33°C, the increase in alveolar ventilation was restricted almost entirely to the increase in respiratory dead space ventilation until respiratory volume reached to a level of around three times (60l/min) of the resting values. However, the gradual increase in alveolar ventilation of the ewes was observed up to a respiratory minute volume of about 60l/min. At 18°C, alveolar ventilation volume was greater than dead-space ventilation volume at respiratory minute volume less than about 45l/min. 4. Changes in body temperature during exercise was independent of ambient temperature, but depended on the intensity of exercise.
日本生気象学会の論文