Sweat lactate secretion during exercise in relation to women's aerobic capacity

Lamont, Linda S.

doi:10.1152/jappl.1987.62.1.194

“…The mean sweat Lac -of women (14.3 mM) in the present study, however, was much lower than that of sedentary (100 mM) or fit (43 mM) women (8). The method of collecting sweat (plastic bags vs whole body washdown) and the exercise intensity (50 vs 70% VO 2max ) may have accounted for the difference.…”

Section: Discussioncontrasting

confidence: 68%

“…Although children's sweat Lac -after bout 1 was higher than that of adults, this cannot be accounted for by their lower SR. We found a negative but very weak association between SR and sweat Lac -(P > 0.05, r = -0.27, for all subjects). Such a relationship is not consistent since some investigators have reported an inverse correlation (7,8,24), while studies using single sweat glands have shown a significant positive correlation (14), or none at all (13).…”

Section: Blood Resultsmentioning

confidence: 91%

Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat

Meyer¹,

Laitano²,

Bar-Or³

et al. 2007

Braz J Med Biol Res

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The dependence of sweat composition and acidity on sweating rate (SR) suggests that the lower SR in children compared to adults may be accompanied by a higher level of sweat lactate (Lac -) and ammonia (NH 3 ) and a lower sweat pH. Four groups (15 girls, 18 boys, 8 women, 8 men) cycled in the heat (42ºC, 20% relative humidity) at 50% VO 2max for two 20-min bouts with a 10-min rest before bout 1 and between bouts. Sweat was collected into plastic bags attached to the subject's lower back. During bout 1, sweat from girls and boys had higher Lac -concentrations (23.6 ± 1.2 and 21.2 ± 1.7 mM; P < 0.05) than sweat from women and men (18.2 ± 1.9 and 14.8 ± 1.6 mM, respectively), but Lac -was weakly associated with SR (P > 0.05; r = -0.27). Sweat Lac -concentration dropped during exercise bout 2, reaching similar levels among all groups (overall mean = 13.7 ± 0.4 mM). Children had a higher sweat NH 3 than adults during bout 1 (girls = 4.2 ± 0.4, boys = 4.6 ± 0.6, women = 2.7 ± 0.2, and men = 3.0 ± 0.2 mM; P < 0.05). This difference persisted through bout 2 only in females. On average, children's sweat pH was lower than that of adults (mean ± SEM, girls = 5.4 ± 0.2, boys = 5.0 ± 0.1, women = 6.2 ± 0.5, and men = 6.2 ± 0.4 for bout 1, and girls = 5.4 ± 0.2, boys = 6.5 ± 0.5, women = 5.2 ± 0.2, and men = 6.9 ± 0.4 for bout 2). This may have favored NH 3 transport from plasma to sweat as accounted for by a significant correlation between sweat NH 3 and H + (r = 0.56). Blood pH increased from rest (mean ± SEM; 7.3 ± 0.02) to the end of exercise (7.4 ± 0.01) without differences among groups. These results, however, are representative of sweat induced by moderate exercise in the absence of acidosis.

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“…While total sweat lactate secretion appears positively related to sweat rate, sweat lactate concentration appears to decrease as sweat rate increases (Sato 1977;Lamont 1987;Falk et al 1991), indicative of more dilute sweat. Initially sweat lactate concentrations are high but quickly decline and plateau around 10±15 mmol á l )1 as sweat rate increases (Astrand 1963;Sato 1977;Green et al 1999 in review).…”

Section: Introductionmentioning

confidence: 96%

“…As sweat rate varies, metabolic requirements of eccrine glands will change concurrently. Consequently a variation in sweat rate may aect sweat lactate concentration (Astrand 1963;Fellmann et al 1985;Falk et al 1991;Lamont 1987). Males have been shown to start sweating earlier and have a greater overall sweat rate than females before and after acclimatization (Horstman and Christensen 1982;Kenney 1985).…”

Section: Introductionmentioning

confidence: 99%

Gender differences in sweat lactate

Green

¹

,

Bishop

²

,

Muir

³

et al. 2000

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Sweat rate may affect sweat lactate concentration. The current study examined potential gender differences in sweat lactate concentrations because of varying sweat rates. Males (n = 6) and females (n = 6) of similar age, percentage body fat, and maximal oxygen consumption (VO2max) completed constant load (CON) cycling (30 min--approximately 40% VO2max) and interval cycling (INT) (15 1-min intervals each separated by 1 min of rest) trials at 32 (1) degrees C wet bulb globe temperature (WBGT). Trials were preceded by 15 min of warm-up (0.5 kp, 60 rpms) and followed by 15 min of rest. Blood and sweat samples were collected at 15, 25, 35, 45, and 60 min during each trial. Total body water loss was used to calculate sweat rate. Blood lactate concentrations (CON approximately equal to 2 mmol.l-1, INT approximately equal to 6 mmol.l-1) and sweat lactate concentrations (CON and INT approximately equal to 12 mmol.l-1) were not significantly different (P > 0.05) at any time between genders for CON or INT. Overall sweat rates (ml.h-1) were not significantly different (P > 0.05) between trials but were significantly greater (P < or = 0.05) for males than for females for CON [779.7 (292.6) versus 450.3 (84.6) ml.h-1] and INT [798.0 (268.3) versus 503.0 (41.4) ml.h-1]. However, correcting for surface area diminished the difference [CON: 390.7 (134.4) versus 277.7 (44.4) ml.h-1, INT: 401.5 (124.1) versus 310.6 (23.4) ml.h-1 (P < or = 0.07)]. Estimated total lactate secretion was significantly greater (P < or = 0.05) in males for CON and INT. Results suggest that sweat rate differences do not affect sweat lactate concentrations between genders.

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“…These factors may in turn determine the concentration of a person's sweat Lac -and NH 3 . For example, SR was shown to inversely correlate with sweat Lac - (7,8). Lamont (8) detected very high sweat Lac -(43-100 mM) in women and suggested that this reflects women's lower SR.…”

Section: Introductionmentioning

confidence: 99%

Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat

Meyer

¹

,

Laitano

²

,

Bar‐Or

³

et al. 2007

Braz J Med Biol Res

View full text Add to dashboard Cite

The dependence of sweat composition and acidity on sweating rate (SR) suggests that the lower SR in children compared to adults may be accompanied by a higher level of sweat lactate (Lac -) and ammonia (NH 3 ) and a lower sweat pH. Four groups (15 girls, 18 boys, 8 women, 8 men) cycled in the heat (42ºC, 20% relative humidity) at 50% VO 2max for two 20-min bouts with a 10-min rest before bout 1 and between bouts. Sweat was collected into plastic bags attached to the subject's lower back. During bout 1, sweat from girls and boys had higher Lac -concentrations (23.6 ± 1.2 and 21.2 ± 1.7 mM; P < 0.05) than sweat from women and men (18.2 ± 1.9 and 14.8 ± 1.6 mM, respectively), but Lac -was weakly associated with SR (P > 0.05; r = -0.27). Sweat Lac -concentration dropped during exercise bout 2, reaching similar levels among all groups (overall mean = 13.7 ± 0.4 mM). Children had a higher sweat NH 3 than adults during bout 1 (girls = 4.2 ± 0.4, boys = 4.6 ± 0.6, women = 2.7 ± 0.2, and men = 3.0 ± 0.2 mM; P < 0.05). This difference persisted through bout 2 only in females. On average, children's sweat pH was lower than that of adults (mean ± SEM, girls = 5.4 ± 0.2, boys = 5.0 ± 0.1, women = 6.2 ± 0.5, and men = 6.2 ± 0.4 for bout 1, and girls = 5.4 ± 0.2, boys = 6.5 ± 0.5, women = 5.2 ± 0.2, and men = 6.9 ± 0.4 for bout 2). This may have favored NH 3 transport from plasma to sweat as accounted for by a significant correlation between sweat NH 3 and H + (r = 0.56). Blood pH increased from rest (mean ± SEM; 7.3 ± 0.02) to the end of exercise (7.4 ± 0.01) without differences among groups. These results, however, are representative of sweat induced by moderate exercise in the absence of acidosis.

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Sweat lactate secretion during exercise in relation to women's aerobic capacity

Cited by 44 publications

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Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat

Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat

Gender differences in sweat lactate

Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat

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