Table 4.

HRV measure correlations.

HRV measure correlations, circadian rhythm removed
		1	2	3	4	5	6	7	8
1.	IBI, ms	1	0.72**	0.89**	0.86**	0.86**	0.68**	0.87**	−0.65**
2.	SDNN, ms	0.72**	1	0.86**	0.83**	0.85**	0.79**	0.86**	−0.47**
3.	ln RMSSD, ms	0.89**	0.86**	1	0.95**	0.94**	0.89**	0.99**	−0.55**
4.	ln TP, ms2/Hz	0.86**	0.83**	0.95**	1	0.99**	0.94**	0.92**	−0.34**
5.	ln VLF, ms2/Hz	0.86**	0.85**	0.94**	0.99**	1	0.92**	0.90**	−0.35**
6.	ln LF, ms2/Hz	0.68**	0.79**	0.89**	0.94**	0.92**	1	0.87**	−0.14**
7.	ln HF, ms2/Hz	0.87**	0.86**	0.99**	0.92**	0.90**	0.87**	1	−0.61**
8.	ln LF/HF	−0.65**	−0.47**	−0.55**	−0.34**	−0.35**	−0.14**	−0.61**	1

*p < 0.05, **p < 0.01.