. Author manuscript; available in PMC: 2023 Dec 1.

Published in final edited form as: PM R. 2022 Mar 12;14(12):1483–1489. doi: 10.1002/pmrj.12770

Table 2.

Mean (± standard deviation) heart rate variability components for unpaced and paced breathing following spinal cord injury.

Heart Rate Variability Component	Unpaced Breathing	Paced Breathing	P-value
LF power (ms²)	1292 ± 1328	573 ± 741	p<0.001
HF power (ms²)	849 ± 1218	989 ± 1454	p=0.53
LF:HF ratio	3.2 ± 5.1	1.1 ± 1.6	p<0.001
SDNN (ms)	58.2 ± 27.4	54.3 ± 28.9	p=0.04
RMSSD (ms)	50.2 ± 35.3	53.1 ± 40.5	p=0.83

LF= Low Frequency; HF= High Frequency; SDNN=Standard Deviation of NN intervals; RMSSD=Root Mean Square of Successive Differences between beats.