Heart Rate Variability in Shift Workers: Responses to Orthostatism and Relationships with Anthropometry, Body Composition, and Blood Pressure

Table 3

Spearman correlation coefficients (Rho) between heart rate variability measures (supine position) and age, anthropometric, body composition, and clinical variables.

Variables
Age	−0.04
Anthropometric
Body mass index (kg/m²)					0.05
Waist circumference (cm)					0.05
Neck circumference (cm)					0.04
Waist-to-hip ratio					0.05
Waist-to-height ratio					0.05
Body composition
Total body fat (%)					0.03
Total body fat (kg)					0.03
Visceral fat area (cm²)					0.04
Clinical
Systolic blood pressure (mmHg)
Diastolic blood pressure (mmHg)

, natural logarithm of power in the high frequency range; , natural logarithm of the heart rate; , natural logarithm of power in the low frequency range; , natural logarithm of the ratio LF (ms²)/HF (ms²); , natural logarithm of the root mean square of successive RR interval differences; represents .