Table 3 Correlations among different HRV metrics.

	HR	LnLF/HF	RRI	SDNN	LnTP	LnVLF	LnLF	LnHF	LnRMSSD
HR	1	0.73	0.98	− 0.69	0.62	− 0.62	0.47	0.71	− 0.79
LnLF/HF	0.73	1	0.68	− 0.56	0.53	− 0.5	0.33	0.78	− 0.81
RRI	0.98	− 0.68	1	0.72	0.64	0.65	0.48	0.68	0.74
SDNN	0.69	− 0.56	0.72	1	0.96	0.96	0.84	0.85	0.79
LnTP	0.62	− 0.53	0.64	0.96	1	0.98	0.91	0.89	0.83
LnVLF	0.62	− 0.5	0.65	0.96	0.98	1	0.85	0.83	0.78
LnLF	0.47	− 0.33	0.48	0.84	0.91	0.85	1	0.83	0.73
LnHF	0.71	− 0.78	0.68	0.85	0.89	0.83	0.83	1	0.94
LnRMSSD	0.79	− 0.81	0.74	0.79	0.83	0.78	0.73	0.94	1

There are 2 main correlating blocks shown in bold; metrics within a bold block tend to correlate strongly with each other, whereas metrics from different blocks tend to anti-correlate strongly.

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