Sweat lactate results from eccrine gland metabolism, however, the possible clearance of blood lactate through sweat has not been resolved. On separate days in an environmental chamber (32 ° ± 1 °C) 12 subjects completed a constant load (CON) (30 min at 40 % V˙O2 max) and an interval cycling trial (INT) (15 one-min intervals at 80 % V˙O2 max, each separated by one min rest) each designed to elicit different blood lactate responses. Each 30 min cycling trial was preceded by 15 min warm-up (30 watts) and followed by 15 min passive rest. Sweat and blood were analyzed for lactate concentration at 15, 25, 35, 45, and 60 min during CON and INT. Total body water loss was used to calculate sweat rate (ml/hr). Blood lactate was significantly greater (p ≤ 0.05) at 25, 35, 45, and 60 min during INT compared to CON (∼ 5 mmol/L vs 1.5 mmol/L). Sweat lactate was not significantly different (p > 0.05) between trials at any time (∼ 10 mmol/L). Sweat rates (∼ 600 ml/hr) and estimated total lactate secretion were not significantly different (CON vs. INT) (p > 0.05). Elevated blood lactate was not associated with changes in sweat lactate concentration. Sweat lactate seems to originate in eccrine glands independent of blood lactate.
Key words:
Sweat composition, lactic acid, eccrine sweat, sweat glands.
References
-
1
Ament W, Huizenga J R, Mook G A, Gips C H, Verkerke G J.
Lactate and ammonia concentration in blood and sweat during incremental cycle ergometer exercise.
Int J Sports Med.
1997;
18
35-39
-
2
Astrand I.
Lactate content in sweat.
Acta Physiol Scand.
1963;
58
359-367
-
3 Balado D. The American College of Sports Medicine Guidelines for Exercise Testing and Prescription. Baltimore; Williams and Wilkins 1995 5th ed
-
4
Brisson G R, Boisvert P, Peronnet H, Perrault H, Boisvert D, Lafond J S.
A simple and disposable sweat collector.
Eur J Appl Physiol.
1991;
50
405-411
-
5
Czarnowski D, Gorski J.
Sweat ammonia excretion during submaximal cycling exercise.
J Appl Physiol.
1991;
70
371-374
-
6
Dubois D, Dubois E F.
A formula to estimate the approximate surface area if height and weight be known.
Arch Environ Med.
1916;
17
863-871
-
7
Falk B, Bar-Or O, MacDougall J D, McGillis L, Calvert R, Meyer F.
Sweat lactate in exercising children and adolescents of varying physical maturity.
J Appl Physiol.
1991;
71
1735-1740
-
8
Fellmann N, Grizard G, Coudert J.
Human frontal sweat rate and lactate concentration during heat exposure and exercise.
J Appl Physiol.
1983;
54
355-360
-
9
Gordon Jr R S, Thompson R H, Muenzer J, Thrasher D.
Sweat lactate in man is derived from blood glucose.
J Appl Physiol.
1971;
31
713-716
-
10
Jackson A S, Pollock M L.
Generalized equations for predicting body density for men.
Br J Nutr.
1978;
40
497-504
-
11
Kenney L W.
A review of comparative responses of men and women to heat stress.
Environ Res.
1985;
37
1-11
-
12 Kuono Y. Human Perspiration. Illinois; C. C. Thomas 1956
-
13
Lamont L.
Sweat lactate secretion during exercise in relation to women's aerobic capacity.
J Appl Physiol.
1987;
62
194-198
-
14
Pilardeau P A, Chalumeau M T, Harichaux P, Vasseur P, Vaysse J, Garnier M.
Effect of physical training on exercise induced sweating in men.
Sports Med Phys Fitness.
1988;
28
176-180
-
15
Sato K.
The physiology, pharmacology, and biochemistry of the eccrine sweat gland.
Rev Physiol Biochem Pharmacol.
1977;
79
51-131
-
16
Weiner J S, Van Heyningen R E.
Observations on lactate content of sweat.
J Appl Physiol.
1952;
4
733-744
-
17
Wolfe S, Cage G, Epstein M, Tice L, Miller H, Gordon Jr R S.
Metabolic studies of isolated human eccrine sweat glands.
J Clin Invest.
1970;
49
1880-1884
J. M. Green
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