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James M. Green, Phil A. Bishop, Ian H. Muir and Richard G. Lomax

Sweat lactate is at least partly derived from eccrine-gland metabolism. This study examined whether potential age-associated changes in sweat rate and skin blood flow influence sweat lactate. Six middle-aged (51.5 ± 3.8 years) and 6 younger (25.8 ± 1.5 years) men similar in VO2max, height, weight, percent body fat, and surface area completed constant-load (CON) cycling and interval-cycling (INT) trials. During each trial, sweat and blood were analyzed for lactate concentration at 15, 25, 35, 45, and 60 min. Sweat rates and estimated total lactate secretion were not significantly different (p > .05) between trials or groups. Blood-lactate concentrations were not significantly different between groups during CON but were significantly higher in younger men at 35 min and 45 min during INT. Sweat-lactate concentrations were not significantly different (p > .05) between groups during CON or INT. These results suggest that differences in eccrine-gland metabolism between young and middle-aged men are minimal.

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Buffie Longmire-Avital, Takudzwa Madzima and Elyse Bierut

rate, breathing rate, and sweat rate. This type of moderate activity corresponds to a target heart range between 64–76% of HRmax ( Garber et al., 2011 ). There is a dose-dependent increase in health benefits associated with increased exercise intensity, however the health benefits of physical activity

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-reported hot flush frequency and severity were recorded before and after the intervention. Physiological hot flushes were recorded through measurement of skin blood flow and sweat rate, from which thresholds for vasodilation and sweating could be established. Following training, no significant changes in