Abstract
Telemetry-equipped rats were subjected to hyperthermia (H, T c=41.5°C) with and without dehydration (D, 9% loss of body weight) stresses. Time domain and spectral analysis of heart rate variability indicated that the dehydrated hyperthermic (DH) rats had increased sympathetic activity compared to H rats, and DH rats had decreased parasympathetic activity compared to less hyperthermic D rats. These non-invasive measures of physiological strain discriminated the more physiologically stressful of these states.
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