Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.

<h4>Purpose</h4>Assessment of post-exercise changes in hydration with bioimpedance (BI) is complicated by physiological adaptations that affect resistance (R) and reactance (Xc) values. This study investigated exercise-induced changes in R and Xc, independently and in bioelectrical imped...

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Autores principales:	Hannes Gatterer, Kai Schenk, Lisa Laninschegg, Philipp Schlemmer, Henry Lukaski, Martin Burtscher
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2020640bc7644db4960fa133663002ce
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spelling	oai:doaj.org-article:2020640bc7644db4960fa133663002ce2021-11-25T05:57:58ZBioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.1932-620310.1371/journal.pone.0109729https://doaj.org/article/2020640bc7644db4960fa133663002ce2014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0109729https://doaj.org/toc/1932-6203<h4>Purpose</h4>Assessment of post-exercise changes in hydration with bioimpedance (BI) is complicated by physiological adaptations that affect resistance (R) and reactance (Xc) values. This study investigated exercise-induced changes in R and Xc, independently and in bioelectrical impedance vector analysis, when factors such as increased skin temperature and blood flow and surface electrolyte accumulation are eliminated with a cold shower.<h4>Methods</h4>Healthy males (n = 14, 24.1±1.7 yr; height (H): 182.4±5.6 cm, body mass: 72.3±6.3 kg) exercised for 1 hr at a self-rated intensity (15 BORG) in an environmental chamber (33°C and 50% relative humidity), then had a cold shower (15 min). Before the run BI, body mass, hematocrit and Posm were measured. After the shower body mass was measured; BI measurements were performed continuously every 20 minutes until R reached a stable level, then hematocrit and Posm were measured again.<h4>Results</h4>Compared to pre-trial measurements body mass decreased after the run and Posm, Hct, R/H and Xc/H increased (p<0.05) with a corresponding lengthening of the impedance vector along the major axis of the tolerance ellipse (p<0.001). Changes in Posm were negatively related to changes in body mass (r = -0.564, p = 0.036) and changes in Xc/H (r = -0.577, p = 0.041).<h4>Conclusions</h4>Present findings showed that after a bout of exercise-induced dehydration followed by cold shower the impedance vector lengthened that indicates fluid loss. Additionally, BI values might be useful to evaluate fluid shifts between compartments as lower intracellular fluid loss (changed Xc/R) indicated greater Posm increase.Hannes GattererKai SchenkLisa LaninscheggPhilipp SchlemmerHenry LukaskiMartin BurtscherPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e109729 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hannes Gatterer Kai Schenk Lisa Laninschegg Philipp Schlemmer Henry Lukaski Martin Burtscher Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
description	<h4>Purpose</h4>Assessment of post-exercise changes in hydration with bioimpedance (BI) is complicated by physiological adaptations that affect resistance (R) and reactance (Xc) values. This study investigated exercise-induced changes in R and Xc, independently and in bioelectrical impedance vector analysis, when factors such as increased skin temperature and blood flow and surface electrolyte accumulation are eliminated with a cold shower.<h4>Methods</h4>Healthy males (n = 14, 24.1±1.7 yr; height (H): 182.4±5.6 cm, body mass: 72.3±6.3 kg) exercised for 1 hr at a self-rated intensity (15 BORG) in an environmental chamber (33°C and 50% relative humidity), then had a cold shower (15 min). Before the run BI, body mass, hematocrit and Posm were measured. After the shower body mass was measured; BI measurements were performed continuously every 20 minutes until R reached a stable level, then hematocrit and Posm were measured again.<h4>Results</h4>Compared to pre-trial measurements body mass decreased after the run and Posm, Hct, R/H and Xc/H increased (p<0.05) with a corresponding lengthening of the impedance vector along the major axis of the tolerance ellipse (p<0.001). Changes in Posm were negatively related to changes in body mass (r = -0.564, p = 0.036) and changes in Xc/H (r = -0.577, p = 0.041).<h4>Conclusions</h4>Present findings showed that after a bout of exercise-induced dehydration followed by cold shower the impedance vector lengthened that indicates fluid loss. Additionally, BI values might be useful to evaluate fluid shifts between compartments as lower intracellular fluid loss (changed Xc/R) indicated greater Posm increase.
format	article
author	Hannes Gatterer Kai Schenk Lisa Laninschegg Philipp Schlemmer Henry Lukaski Martin Burtscher
author_facet	Hannes Gatterer Kai Schenk Lisa Laninschegg Philipp Schlemmer Henry Lukaski Martin Burtscher
author_sort	Hannes Gatterer
title	Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
title_short	Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
title_full	Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
title_fullStr	Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
title_full_unstemmed	Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
title_sort	bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/2020640bc7644db4960fa133663002ce
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Bioimpedance identifies body fluid loss after exercise in the heat: a pilot study with body cooling.

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