Abstract
The aim of this study is to know whether physical activity affects animal fs behavioral responses during heat with osmotic stimulus. Male ICR mice (2–4 mo, age) were divided into two groups: one group had free access to running wheel for 8 weeks (WR, n=20) and the other not (NWR, n=20). After subcutaneous injection (1 ml/100 g of body weight) of either isotonic‐ (154 mM, IS) or hypertonic‐ saline (2,500 mM, HS), each mouse was placed in a behavior box with 5 peltier boards at the bottom, where a) thermal mosaic (temperature of each board was randomly chosen among set at 15 Ž, 22 Ž, 28 Ž, 35 Ž, or 39 Ž and was changed each 6 min) or b) operant behavior available (the temperature of each board was set at 39 Ž; right‐end board temperature was changed to 20 Ž for 60 seconds when a mouse moved to left‐first two boards). In the results, WR group had significant operant behavioral responses than NWR group during osmotic stimulus in the heat (2 times higher than NWR) and prefer lower temperature (32.8 Ž vs 34.8 Ž in average). These results indicate that physical activity may improve behavioral thermoregulation in dehydrated mice in the heat. In particular, physical activity may lower the thermal preference.
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