Change in body mass accurately and reliably predicts change in body water after endurance exercise

Lindsay B. Baker, James A. Lang, W. Larry Kenney

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


This study tested the hypothesis that the change in body mass (ΔBM) accurately reflects the change in total body water (ΔTBW) after prolonged exercise. Subjects (4 men, 4 women; 22-36 year; 66 ±10 kg) completed 2 h of interval running (70% V O2max) in the heat (30°C), followed by a run to exhaustion (85% V O2max), and then sat for a 1 h recovery period. During exercise and recovery, subjects drank fluid or no fluid to maintain their BM, increase BM by 2%, or decrease BM by 2 or 4% in separate trials. Pre- and post-experiment TBW were determined using the deuterium oxide (D2O) dilution technique and corrected for D2O lost in urine, sweat, breath vapor, and nonaqueous hydrogen exchange. The average difference between ΔBM and ΔTBW was 0.07 ± 1.07 kg (paired t test, P = 0.29). The slope and intercept of the relation between ΔBM and ΔTBW were not significantly different from 1 and 0, respectively. The intraclass correlation coefficient between ΔBM and ΔTBW was 0.76, which is indicative of excellent reliability between methods. Measuring pre- to post-exercise ΔBM is an accurate and reliable method to assess the ΔTBW.

Original languageEnglish (US)
Pages (from-to)959-967
Number of pages9
JournalEuropean Journal of Applied Physiology
Issue number6
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physiology (medical)


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