Autonomic Modulation and Body Composition in Educators: Physiological Associations in the Workplace Context.

Area of Science:

• Physiology
• Cardiology
• Public Health

Background:

• Cardiac autonomic nervous system (ANS) activity, assessed via heart rate variability (HRV), is crucial for cardiovascular health.
• Body composition, including body fat mass (BFM) and fat-free mass (FFM), is increasingly recognized as a factor influencing physiological functions.
• Understanding the interplay between body composition and ANS function is vital for developing targeted health interventions, particularly in occupational groups like educators.

Purpose of the Study:

• To investigate the relationship between body composition (BFM and FFM) and cardiac autonomic nervous system activity in educators.
• To explore how different heart rate variability (HRV) indices are associated with BFM and FFM.
• To determine if FFM moderates the association between BFM and autonomic function.

Main Methods:

• A descriptive cross-sectional study involving 253 educators was conducted.
• Autonomic regulation was assessed using heart rate variability (HRV) measurements.
• Body composition was determined through bioelectrical impedance analysis.

Main Results:

• Higher BFM correlated with reduced parasympathetic activity (lower RMSSD) and increased mean heart rate.
• Greater FFM was associated with more efficient cardiac activity, indicated by lower mean, minimum, and maximum heart rates.
• FFM partially moderated the relationship between BFM and mean heart rate; higher total body water content was linked to sympathetic dominance.

Conclusions:

• Body composition, specifically FFM and BFM, significantly influences HRV and autonomic nervous system modulation in educators.
• These findings highlight the importance of considering body composition in assessing autonomic function.
• Personalized health strategies for educators should incorporate body composition assessments and interventions.