Related Experiment Video
Updated: Jul 1, 2025
07:44
Author Spotlight: Implementation of BIVA for Analyzing Disease Risk Factors in Patients with Low Body Cell Mass
Published on: July 14, 2023
1.1K
One-Year Changes in Bioelectrical Impedance Data in Adolescent Athletes
Marcus Vinícius de Oliveira Cattem1, Camila E Orsso2, Maria Cristina Gonzalez3
1Nutrition Institute, Rio de Janeiro State University, Rio de Janeiro 20550-013, Brazil.
Nutrients
|March 13, 2024
Summary
This longitudinal study reveals that raw bioelectrical impedance (BI) data and vector analysis (BIVA) reveal sex-specific changes in adolescent athletes over one year. These methods effectively track changes in fat-free mass (FFM) and body composition, highlighting differences between males and females.
Area of Science:
- Sports Science
- Human Physiology
- Body Composition Analysis
Background:
- Cross-sectional studies have utilized raw bioelectrical impedance (BI) data and vector analysis (BIVA) to assess fat-free mass (FFM) in adolescent athletes.
- Longitudinal data on the changes in BI parameters and FFM in this population are lacking.
Purpose of the Study:
- To longitudinally assess the magnitude of changes in raw BI data (resistance [R], reactance [Xc], and phase angle [PhA]), BIVA, and FFM in adolescent athletes over one year.
- To investigate sex-dependent patterns in these changes based on initial age and time interval.
Main Methods:
- A cohort of 137 adolescent athletes (40% female) underwent single-frequency BI measurements at baseline and after one year.
- Participants were categorized by chronological age at baseline (11, 12, or 13 years).
- Analysis included raw BI data (R/H, Xc/H, PhA), BIVA ellipse distances, and FFM, examining effects of time interval and initial age.
Main Results:
- In females, reactance/height (Xc/H) increased, while resistance/height (R/H) decreased. Fat-free mass (FFM) and phase angle (PhA) increased, with smaller changes observed in older age groups.
- In males, Xc/H decreased, R/H decreased, and FFM increased. PhA increased in the oldest group. BIVA showed significant differences in males but not females.
- Time interval significantly influenced PhA and Xc/H in females, and R/H and Xc/H in males. Initial age and time interval affected PhA increase in males.
Conclusions:
- Raw bioelectrical impedance data and BIVA patterns can detect longitudinal changes in body composition in adolescent athletes.
- The magnitude and pattern of these changes are sex-dependent and influenced by the athlete's initial age and the duration of sports practice.
- This study provides novel longitudinal insights into body composition changes in young athletes, emphasizing the importance of sex-specific analysis.
