title: Sweat lactate response between males with high and low aerobic fitness.
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 ( VO(2)peak): 61.6 (2.5) ml.kg(-1).min(-1)] and seven males with low aerobic fitness [ VO(2)peak: 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 degrees C wet bulb globe temperature environment. Intensity was individualized at 90% of the ventilatory threshold ( V(E)/ VO(2) increase with no concurrent V(E)/ VCO(2) 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 (SRxmean 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.
authors.affiliation: Department of Physical Education and Recreation, Western Kentucky University, 1 Big Red Way, Bowling Green, KY 42101, USA. matt.green@wku.edu
authors.forename: J M
authors.initials: JM
authors.lastname: Green
authors.forename: R C
authors.initials: RC
authors.lastname: Pritchett
authors.forename: T R
authors.initials: TR
authors.lastname: Crews
authors.forename: J R
authors.initials: JR
authors.lastname: McLester
authors.forename: D C
authors.initials: DC
authors.lastname: Tucker
mesh_terms: D000328:Adult; D001833:Body Temperature Regulation; D004439:Eccrine Glands / Q000737:chemistry; D006801:Humans; D019344:Lactic Acid / Q000032:analysis*; D008297:Male; D010809:Physical Fitness / Q000502:physiology*; D013542:Sweat / Q000737:chemistry*
chemical_list: D019344:Lactic Acid