Thermal environmental stress can anticipate acute fatigue during exercise at a fixed intensity (%VO2max). Controversy exists about whether this anticipation is caused by the absolute internal temperature (Tint, oC), by the heat storage rate (HSR, cal/min) or by both mechanisms. The aim of the present study was to study acute fatigue (total exercise time, TET) during thermal stress by determining Tint and HSR from abdominal temperature. Thermal environmental stress was controlled in an environmental chamber and determined as wet bulb globe temperature (oC), with three environmental temperatures being studied: cold (18oC), thermoneutral (23.1oC) or hot (29.4oC). Six untrained male Wistar rats weighing 260-360 g were used. The animals were submitted to exercise at the same time of day in the three environments and at two treadmill velocities (21 and 24 m/min) until exhaustion. After implantation of a temperature sensor and treadmill adaptation, the animals were submitted to a Latin square experimental design using a 2 x 3 factorial scheme (velocity and environment), with the level of significance set at P
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机译：热环境压力可以在锻炼期间以固定强度（％VO2max）引起急性疲劳。关于这种预期是由绝对内部温度（Tint，oC），由储热速率（HSR，cal / min）还是由两种机制引起的争议。本研究的目的是通过从腹部温度确定Tint和HSR来研究热应激期间的急性疲劳（总运动时间，TET）。在一个环境室内控制热环境应力，并将其确定为湿球温度（oC），研究了三种环境温度：冷（18oC），热中性（23.1oC）或热（29.4oC）。使用六只体重为260-360g的未经训练的雄性Wistar大鼠。在一天中的同一时间在三种环境中以两个跑步机速度（21和24 m / min）对动物进行运动，直到筋疲力尽。植入温度传感器并在跑步机上进行调整后，使用2 x 3阶乘方案（速度和环境）将动物接受拉丁方实验设计，其显着性水平设置为P
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