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Sport medicine

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Bioimpedance Identifies Body Fluid Loss after Exercise in the Heat: A Pilot Study with Body Cooling
Hannes Gatterer, Kai Schenk, Lisa Laninschegg, Philipp Schlemmer, Henry Lukaski, Martin Burtscher

Assessment of post-exercise changes in hydration with bioimpedance is complicated by physiological adaptations that affect resistance (R) and reactance (Xc) values. Gatterer et al 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 15 minutes cold shower. Before the run, bioimpedance values , body mass, hematocrit and Posm were measured.

After the shower body mass was measured; bioimpedance measurements were performed continuously every 20 minutes until R reached a stable level, then hematocrit and Posm were measured again.

Results: 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).In conclusion this study demonstrated that BIVA changes convincingly mirrors water loss within an exercise and heat induced fluid loss trial. (Use of BIA 101 Anniversary Sport edition)

PLoS One. 2014; 9(10): e109729. Published online 2014 October 3. doi: 10.1371/journal.pone.0109729
Copyright: _ 2014 Gatterer et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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