Table 3.

Correlation between physical activity and heart rate variability.

HRV Variables	Male		Female
	r	p value	r	p value
SDNN	0.06	0.76	0.07	0.73
RMSSD	0.08	0.71	0.10	0.64
PNN50	0.02	0.90	0.11	0.61
Total Power	0.008	0.97	0.03	0.87
VLF	0.010	0.96	0.01	0.96
LF (ms2)	0.011	0.96	0.11	0.60
HF (ms2)	0.005	0.98	0.16	0.47
LF/HF ratio	0.10	0.64	0.24	0.26

Abbreviations: Frequency domain variables of Heart rate variability: VLF- Absolute power of the very-low-frequency band (0.0033–0.04 Hz)– milli-second square, LF - Power in the low-frequency range (0·04–0·15 Hz), HF - Power in the high-frequency range (0·15–0·4 Hz), LF/HF ratio -Ratio of LF [ms²]/HF [ms²].

Time-domain variables of HRV: SDNN- Standard deviation of NN intervals(ms), RMSSD- Root mean square of successive RR interval differences(ms), pNN50- Percentage of successive RR intervals that differ by more than 50 ms (%).