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Interindividual variability in sweat electrolyte concentration in marathoners
dc.contributor.author | Lara, B | |
dc.contributor.author | Gallo-Salazar, C. | |
dc.contributor.author | Puente, Carlos | |
dc.contributor.author | Areces, F. | |
dc.contributor.author | Salinero, J.J. | |
dc.contributor.author | Del Coso, J. | |
dc.date.accessioned | 2017-07-21T12:15:32Z | |
dc.date.available | 2017-07-21T12:15:32Z | |
dc.date.issued | 2016 | |
dc.identifier.uri | http://hdl.handle.net/20.500.12020/311 | |
dc.description.abstract | Background: Sodium (Na+) intake during exercise aims to replace the Na+ lost by sweat to avoid electrolyteimbalances, especially in endurance disciplines. However, Na+ needs can be very different among individuals because of the great inter-individual variability in sweat electrolyte concentration. The aim of this investigation was to determine sweat electrolyte concentration in a large group of marathoners. Methods: A total of 157 experienced runners (141 men and 16 women) completed a marathon race (24.4 ± 3.6 °C and 27.7 ± 4.8 % of humidity). During the race, sweat samples were collected by using sweat patches placed on the runners’ forearms. Sweat electrolyte concentration was measured by using photoelectric flame photometry. Results: As a group, sweat Na+ concentration was 42.9 ± 18.7 mmol·L−1 (minimal-maximal value = 7.0–95.5 mmol·L−1), sweat Cl− concentration was 32.2 ± 15.6 mmol·L−1 (7.3–90.6 mmol·L−1) and sweat K+ concentration was 6.0 ± 0.9 mmol·L−1 (3.1–8.0 mmol·L−1). Women presented lower sweat Na+ (33.9 ± 12.1 vs 44.0 ± 19.1 mmol·L−1; P = 0.04) andsweat Cl− concentrations (22.9 ± 10.5 vs 33.2 ± 15.8 mmol·L−1; P = 0.01) than men. A 20 % of individuals presented asweat Na+ concentration higher than 60 mmol·L−1 while this threshold was not surpassed by any female marathoner. Sweat electrolyte concentration did not correlate to sweat rate, age, body characteristics, experience or training. Although there was a significant correlation between sweat Na+ concentration and running pace (r = 0.18; P = 0.03), this association was weak to interpret that sweat Na+ concentration increased with running pace. Conclusions: The inter-individual variability in sweat electrolyte concentration was not explained by any individual characteristics except for individual running pace and sex. An important portion (20 %) of marathoners might need special sodium intake recommendations due to their high sweat salt losses. | es |
dc.language.iso | en | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Interindividual variability in sweat electrolyte concentration in marathoners | es |
dc.type | article | es |
dc.issue.number | 31 | es |
dc.journal.title | Journal of the International Society of Sports Nutrition | es |
dc.page.initial | 1 | es |
dc.page.final | 8 | es |
dc.rights.accessRights | openAccess | es |
dc.subject.area | Ciencias de la Actividad Física y del Deporte | es |
dc.subject.keyword | Exercise | es |
dc.subject.keyword | Fluid balance | es |
dc.subject.keyword | Hyponatremia | es |
dc.subject.keyword | Athletes | es |
dc.subject.keyword | Osmolality | es |
dc.subject.keyword | Sex | es |
dc.volume.number | 13 | es |