The purpose of the present study is to investigate sweating responses to isometric handgrip (IH) exercise and muscle metaboreflex in prepubertal children and the elderly. In hot condition (ambient temperature, 35°C; relative humidity, 45%), 13 healthy young adults, 10 prepubertal children, and 10 elderly (age: 20.4±1.2, 11.4±0.5, and 63.5±3.1 years, respectively) repeated three handgrip-exercise protocol that consisted of 1 min IH exercise at 15, 30, or 45% of maximum voluntary contractions (MVC) followed by 2 min post-exercise forearm occlusion. Local sweat rates on forehead, chest, forearm, thigh, and palm were continuously measured (ventilated-capsule method). Forehead sweat rate (SR) in prepubertal children during IH exercise at 45%MVC was significantly lower than that of young adults (0.26±0.22 and 0.08±0.15 mg/cm2/min for young adults and children, respectively, P<0.05) but not of the elderly at any exercise intensities. SR on chest (0.22±0.22 and -0.01±0.05 mg/cm2/min for young adults and children, respectively), forearm (0.14±0.12 and 0.03±0.04 mg/cm2/min), and thigh (0.13±0.10 and 0.02±0.03 mg/cm2/min) during post-exercise occlusion at 45%MVC was significantly lower in children than young adults (P<0.05). Elderly showed significantly lower SR on forearm (0.04±0.04 and 0.01±0.02 mg/cm2/min for young adults and elderly, respectively) and thigh (0.07±0.07 and 0.01±0.03 mg/cm2/min) at 15%MVC and on thigh at 45%MVC (0.13±0.10 and 0.04±0.04 mg/cm2/min) during post-exercise occlusion compared with young adults (P<0.05). These results suggest that sweating responses to IH exercise and muscle metaboreflex were underdeveloped in prepubertal children and then aging attenuates the response to muscle metaboreflex that were not consistent across the body.
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