Effects of Acute Lower Body Resistance Exercise on Body Composition Parameters Assessed by Bioelectrical Impedance Analysis

Authors

Jayden Widener, University of Mary Hardin-BaylorFollow
Elizabeth Hardy, University of Mary Hardin-BaylorFollow
Madison Merritt, University of Mary Hardin-BaylorFollow
Nicholas Murphy, University of Mary Hardin-BaylorFollow
James Scobercea, University of Mary Hardin-BaylorFollow
Jack Wright, University of Mary Hardin-BaylorFollow
Nikolas Keratsopoulos, University of Mary Hardin-BaylorFollow
Christine M. Florez, Texas Tech UniversityFollow
Kindyle L. Brennan, University of Mary Hardin-BaylorFollow
Grant M. Tinsley, Texas Tech UniversityFollow
Jaci Kelly, University of Mary Hardin-BaylorFollow
Mandy E. Parra, School of Exercise and Sport Sciences, University of Mary Hardin-Baylor, Belton, TX, USAFollow
Lemuel W. Taylor IV, University of Mary Hardin - BaylorFollow

Abstract

Bioelectrical Impedance Analysis (BIA) has the capability to estimate skeletal muscle mass (SMM), total body water, and body fat mass (FM) for assessment of body composition. Various factors are thought to influence the accuracy of BIA estimated body composition. PURPOSE: The purpose of this study was to investigate acute changes in BIA SMM and FM results after a prescribed lower body exercise compared to a non-exercise treatment. METHODS: Participants (n = 14; 22.71 ± 1.63 years; 169.42 ± 13.23 cm; 80.79 ± 17.71 kg) completed each trial in a randomly assigned crossover experimental design: resting conditions (REST) and a prescribed lower body workout (LBRE) consisting of 4 sets of 12 repetitions on leg press, leg curls, leg extension, and kettlebell squat. BIA scans were conducted prior to LBRE, immediately post LBRE, and again at 30 and 60 minutes. Linear mixed-effects models were used to evaluate the effect of time, condition, and their interaction, while random intercepts were included to account for between-participant variability. The model was fitted using restricted maximum likelihood estimation. Data was analyzed using R software. RESULTS: No condition by time interactions were present for any BIA body composition variable. However, select effects of time or condition were found. Irrespective of condition, total lean mass estimates at 60 minutes post exercise were ~0.6 kg lower than at baseline (ppCONCLUSIONS: Although it is thought that exercise may affect the reliability of the BIA, an acute bout of lower body resistance exercise did not meaningfully influence group-level BIA estimates in a recreationally active population. Thus, guidelines suggesting to abstain from resistance exercise prior to a BIA might not be essential for some applications, which could allow for greater flexibility in scheduling of body composition assessments.

Recommended Citation

Widener, Jayden; Hardy, Elizabeth; Merritt, Madison; Murphy, Nicholas; Scobercea, James; Wright, Jack; Keratsopoulos, Nikolas; Florez, Christine M.; Brennan, Kindyle L.; Tinsley, Grant M.; Kelly, Jaci; Parra, Mandy E.; and Taylor, Lemuel W. IV (2025) "Effects of Acute Lower Body Resistance Exercise on Body Composition Parameters Assessed by Bioelectrical Impedance Analysis," International Journal of Exercise Science: Conference Proceedings: Vol. 2: Iss. 17, Article 101.
Available at: https://digitalcommons.wku.edu/ijesab/vol2/iss17/101