Muscle development in healthy children evaluated by bioelectrical impedance analysis

Area of Science:

• Pediatric Physiology
• Biomedical Engineering
• Anthropometry

Background:

• Accurate assessment of pediatric muscle development is crucial for monitoring growth and health.
• Traditional methods for evaluating muscle mass and density can be invasive or costly.
• Bioelectrical impedance analysis (BIA) offers a non-invasive, convenient, and economical approach.

Purpose of the Study:

• To introduce and validate a new muscle density index (MDI_BIA) using BIA.
• To assess changes in the BIA-based muscle cross-sectional area index (MCAI_BIA) during childhood growth.
• To determine the chronological traceability of MDI_BIA and MCAI_BIA.

Main Methods:

• 112 healthy children (0.33-14.00 years) underwent BIA measurements of upper arms, thighs, and lower legs.
• MDI_BIA and MCAI_BIA were calculated for cross-sectional growth analysis.
• Longitudinal data from 45 participants (1.10 years follow-up) assessed index traceability.

Main Results:

• MDI_BIA and MCAI_BIA showed significant positive correlations with age and height across all measured body locations (P<0.01).
• The indices reflected muscle characteristics from different perspectives, with location-specific relationships.
• Both MDI_BIA and MCAI_BIA demonstrated significant chronological increases over the follow-up period, except for the upper arm MDI_BIA.

Conclusions:

• MDI_BIA and MCAI_BIA are reliable indicators of muscle development and mass increases in children, correlating well with age and height.
• These BIA-derived indices exhibit significant chronological increases, reflecting normal growth patterns.
• BIA provides a valuable, non-invasive tool for assessing muscle development and cross-sectional areas in pediatric populations.