<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>This study evaluated the influence of acute water ingestion and maintaining an upright posture on raw bioimpedance and subsequent estimates of body fluids and composition. Twenty healthy adults participated in a randomized crossover study. In both conditions, an overnight food and fluid fast was followed by an initial multi-frequency bioimpedance assessment (InBody 770). Participants then ingested 11 mL/kg of water (water condition) or did not (control condition) during a 5-minute period. Thereafter, bioimpedance assessments were performed every 10 minutes for one hour with participants remaining upright throughout. Linear mixed effects models were used to examine the influence of condition and time on raw bioimpedance, body fluids, and body composition. Water consumption increased impedance of the arms but not trunk or legs. However, drift in leg impedance was observed, with decreasing values over time in both conditions. No effects of condition on body fluids were detected, but total body water and intracellular water decreased by ~0.5 kg over time in both conditions. Correspondingly, lean body mass did not differ between conditions but decreased over the measurement duration. The increase in body mass in the water condition was detected exclusively as fat mass, with final fat mass values ~1.3 kg higher than baseline and also higher than the control condition. Acute water ingestion and prolonged standing exert practically meaningful effects on relevant bioimpedance variables quantified by a modern, vertical multi-frequency analyzer. These findings have implications for pre-assessment standardization, methodological reporting, and interpretation of assessments.</p></abstract>

This study evaluated the influence of acute water ingestion and maintaining an upright posture on raw bioimpedance and subsequent estimates of body fluids and composition. Twenty healthy adults participated in a randomized crossover study. In both conditions, an overnight food and fluid fast was followed by an initial multi-frequency bioimpedance assessment (InBody 770). Participants then ingested 11 mL/kg of water (water condition) or did not (control condition) during a 5-minute period. Thereafter, bioimpedance assessments were performed every 10 minutes for one hour with participants remaining upright throughout. Linear mixed effects models were used to examine the influence of condition and time on raw bioimpedance, body fluids, and body composition. Water consumption increased impedance of the arms but not trunk or legs. However, drift in leg impedance was observed, with decreasing values over time in both conditions. No effects of condition on body fluids were detected, but total body water and intracellular water decreased by ~0.5 kg over time in both conditions. Correspondingly, lean body mass did not differ between conditions but decreased over the measurement duration. The increase in body mass in the water condition was detected exclusively as fat mass, with final fat mass values ~1.3 kg higher than baseline and also higher than the control condition. Acute water ingestion and prolonged standing exert practically meaningful effects on relevant bioimpedance variables quantified by a modern, vertical multi-frequency analyzer. These findings have implications for pre-assessment standardization, methodological reporting, and interpretation of assessments.

Influence of acute water ingestion and prolonged standing on raw bioimpedance and subsequent body fluid and composition estimates

Journal of Electrical Bioimpedance

This work is licensed under the Creative Commons Attribution 4.0 International License.

This study evaluated the influence of acute water ingestion and maintaining an upright posture on raw bioimpedance and subsequent estimates of body fluids and...

Influence of acute water ingestion and prolonged standing on raw bioimpedance and subsequent body fluid and composition estimates

Data publikacji: 20 maj 2022

Zakres stron: 10 - 20

Otrzymano: 02 mar 2022

DOI: https://doi.org/10.2478/joeb-2022-0003

Słowa kluczowe
Bioelectrical impedance analysis, hydration, body composition, body fat, muscle mass

© 2022 Grant M. Tinsley, Matthew T. Stratton, Patrick S. Harty, Abegale D. Williams, Sarah J. White, Christian Rodriguez, Jacob R. Dellinger, Baylor A. Johnson, Robert W. Smith, Eric T. Trexler, published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Influence of acute water ingestion and prolonged standing on raw bioimpedance and subsequent body fluid and composition estimates

Data publikacji: 20 maj 2022

Zakres stron: 10 - 20

Otrzymano: 02 mar 2022

DOI: https://doi.org/10.2478/joeb-2022-0003

Słowa kluczoweBioelectrical impedance analysis, hydration, body composition, body fat, muscle mass

© 2022 Grant M. Tinsley, Matthew T. Stratton, Patrick S. Harty, Abegale D. Williams, Sarah J. White, Christian Rodriguez, Jacob R. Dellinger, Baylor A. Johnson, Robert W. Smith, Eric T. Trexler, published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Słowa kluczowe
Bioelectrical impedance analysis, hydration, body composition, body fat, muscle mass