Published in:
01-01-2004 | Original Article
Sweat lactate response between males with high and low aerobic fitness
Authors:
J. M. Green, R. C. Pritchett, T. R. Crews, J. R. McLester Jr., D. C. Tucker
Published in:
European Journal of Applied Physiology
|
Issue 1/2004
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Abstract
Sweat lactate indirectly reflects eccrine gland metabolism. However the potential influence of aerobic fitness on sweat lactate is not well-understood. Six males with high aerobic fitness [peak oxygen consumption (V̇O2peak): 61.6 (2.5) ml·kg−1·min−1] and seven males with low aerobic fitness [V̇O2peak: 41.8 (6.4) ml·kg−1·min−1] completed a maximal exertion cycling trial followed on a different day by 60 min of cycling (60 rev·min−1) in a 30°C wet bulb globe temperature environment. Intensity was individualized at 90% of the ventilatory threshold (V̇
E/V̇O2 increase with no concurrent V̇
E/V̇CO2 increase). Sweat samples were collected from the lumbar region every 10 min and analyzed for lactate concentration. Sweat rate (SR) was significantly greater (p<0.05) for subjects with a high [1445 (254) ml·h−1] versus a low [1056 (261) ml·h−1] fitness level. Also, estimated total lactate excretion (SR×mean sweat lactate concentration) was marginally greater (p=0.2) in highly fit males. However, repeated measures ANOVA showed no significant differences (p>0.05) between groups for sweat lactate concentration at any time point. Current results show highly fit (vs. low fitness level) males have a greater sweat rate which is consistent with previous literature. However aerobic fitness and subsequent variations in SR do not appear to influence sweat lactate concentrations in males.