Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/21344 |
Resumo: | 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 (NH3) 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% VO2max 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 NH3 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 NH3 transport from plasma to sweat as accounted for by a significant correlation between sweat NH3 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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Meyer, FlaviaLionello Neto, Orlando Laitano2010-04-29T04:15:12Z20070100-879Xhttp://hdl.handle.net/10183/21344000664479The 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 (NH3) 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% VO2max 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 NH3 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 NH3 transport from plasma to sweat as accounted for by a significant correlation between sweat NH3 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.application/pdfengBrazilian Journal of Medical Research. Vol. 40, n.1, (jan. 2007),p. 135-143.AmôniaÁcido lácticoExercício físicoFisiologia do exercícioSweat pHElectrolytesAmmoniaLactateEffect of age and gender on sweat lactate and ammonia concentrations during exercise in the heatinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000664479.pdf000664479.pdfTexto completo (inglês)application/pdf490845http://www.lume.ufrgs.br/bitstream/10183/21344/1/000664479.pdfe25edab4476c70fef106c8cf18bf98dbMD51TEXT000664479.pdf.txt000664479.pdf.txtExtracted Texttext/plain34277http://www.lume.ufrgs.br/bitstream/10183/21344/2/000664479.pdf.txt703b07a4119a09d277fa28ee4986114cMD52THUMBNAIL000664479.pdf.jpg000664479.pdf.jpgGenerated Thumbnailimage/jpeg1782http://www.lume.ufrgs.br/bitstream/10183/21344/3/000664479.pdf.jpgbd759ce07597648a70230e642ec47758MD5310183/213442020-03-13 04:17:15.989375oai:www.lume.ufrgs.br:10183/21344Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2020-03-13T07:17:15Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
title |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
spellingShingle |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat Meyer, Flavia Amônia Ácido láctico Exercício físico Fisiologia do exercício Sweat pH Electrolytes Ammonia Lactate |
title_short |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
title_full |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
title_fullStr |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
title_full_unstemmed |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
title_sort |
Effect of age and gender on sweat lactate and ammonia concentrations during exercise in the heat |
author |
Meyer, Flavia |
author_facet |
Meyer, Flavia Lionello Neto, Orlando Laitano |
author_role |
author |
author2 |
Lionello Neto, Orlando Laitano |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Meyer, Flavia Lionello Neto, Orlando Laitano |
dc.subject.por.fl_str_mv |
Amônia Ácido láctico Exercício físico Fisiologia do exercício |
topic |
Amônia Ácido láctico Exercício físico Fisiologia do exercício Sweat pH Electrolytes Ammonia Lactate |
dc.subject.eng.fl_str_mv |
Sweat pH Electrolytes Ammonia Lactate |
description |
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 (NH3) 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% VO2max 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 NH3 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 NH3 transport from plasma to sweat as accounted for by a significant correlation between sweat NH3 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. |
publishDate |
2007 |
dc.date.issued.fl_str_mv |
2007 |
dc.date.accessioned.fl_str_mv |
2010-04-29T04:15:12Z |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/21344 |
dc.identifier.issn.pt_BR.fl_str_mv |
0100-879X |
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000664479 |
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http://hdl.handle.net/10183/21344 |
dc.language.iso.fl_str_mv |
eng |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Brazilian Journal of Medical Research. Vol. 40, n.1, (jan. 2007),p. 135-143. |
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