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Hyperthermia, but not muscle water deficit, increases glycogen use during intense exercise

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dc.contributor.author Mora-Rodríguez, Ricardo
dc.contributor.author Fernández-Elías, Valentín Emilio
dc.contributor.author Hamouti, Nassim
dc.contributor.author Ortega, Juan Fernando
dc.date.accessioned 2018-04-19T11:36:43Z
dc.date.available 2018-04-19T11:36:43Z
dc.date.issued 2015
dc.identifier.citation Scandinavian Journal of Medicine & Science in Sports es_ES
dc.identifier.uri http://hdl.handle.net/10578/17211
dc.description.abstract We determined if dehydration alone or in combination with hyperthermia accelerates muscle glycogen use during intense exercise. Seven endurance-trained cyclists (VO2max = 54.4 ± 1.05 mL/kg/min) dehydrated 4.6% of body mass (BM) during exercise in the heat (150 min at 33 ± 1 °C, 25 ± 2% humidity). During recovery (4 h), subjects remained dehydrated (HYPO trial) or recovered all fluid losses (REH trials). Finally, subjects exercised intensely (75% VO2max) for 40 min in a neutral (25 ± 1 °C; HYPO and REH trials) or in a hot environment (36 ± 1 °C; REHHOT). Before the final exercise bout vastus lateralis glycogen concentration was similar in all three trials (434 ± 57 mmol/kg of dry muscle (dm)) but muscle water content was lower in the HYPO (357 ± 14 mL/100 g dm) than in REH trials (389 ± 25 and 386 ± 25 mL/100 g dm; P < 0.05). After 40 min of intense exercise, intestinal temperature was similar between the HYPO and REHHOT trials (39.2 ± 0.5 and 39.2 ± 0.4 °C, respectively) and glycogen use was similar (172 ± 86 and 185 ± 97 mmol/kg dm, respectively) despite large differences in muscle water content. In contrast, during REH, intestinal temperature (38.5 ± 0.4 °C) and glycogen use (117 ± 52 mmol/kg dm) were significantly lower than during HYPO and REHHOT. Our data suggest that hyperthermia stimulates glycogen use during intense exercise while muscle water deficit has a minor role. es_ES
dc.format text/plain es_ES
dc.language.iso en es_ES
dc.publisher John Wiley and Sons es_ES
dc.rights info:eu-repo/semantics/embargoedAccess es_ES
dc.subject Muscle glycogen es_ES
dc.subject Muscle water conten es_ES
dc.subject Hydration status es_ES
dc.subject Thermoregulation es_ES
dc.subject Performance es_ES
dc.subject Glucógeno muscular es_ES
dc.subject Contenido de agua muscular es_ES
dc.subject Estado de hidratación es_ES
dc.subject Termorregulación es_ES
dc.title Hyperthermia, but not muscle water deficit, increases glycogen use during intense exercise es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.identifier.DOI https://doi.org/10.1111/sms.12368


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