Human frontal sweat rate and lactate concentration during heat exposure and exercise

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Abstract
Output (.ovrhdot.Qsweat) and lactate concentratoin ([L]sweat) in frontal sweat and blood lactate concentration ([L]blood) were monitored in 3 men volunteers: 1 sedentary (S), 1 fit (F) and 1 very fit (VF). Measurements were made under 3 sweating conditions: heat exposure to IR radition (IR) at rest for 25 min at 45.degree. C; bicycle exercise at constant relative maximal aerobic power (87 .+-. 2% MAP) for 25 min (Cst EX) at 23.degree. C; and bicycle exercise at increasing work loads (from 60-95% MAP) in 4 or 5 succesive 5-min steps (Incr EX) at 23.degree. C. .ovrhdot.Qsweat of S was lower than that of F and VF. Changes in [L]sweat were different. In IR and Cst EX, [L]blood remained constant, and [L]sweat decreased with heat load duration similarly in the 3 subjects (the slopes of the 2 curves were not significantly different). At Incr Ex, [L]blood increased and [L]sweat remained constant at S, F and VF (21.71 .+-. 0.85, 16.75 .+-. 0.99, 12.83 .+-. 0.45 (SE) mM, respectively). The high [L]blood and increased adrenergic stimulation observed in Incr Ex could act on [L]sweat in relation to the physical fitness level.

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