Research on Effect of Load Stimulation Change on Heart Rate Variability of Women Volleyball Athletes

Table 3

Changes of HRV time-domain indexes of women volleyball players at different load stages.

	SDNN	RMSSD	SDSD	PNN50
The early stage of the winter training	52.31 ± 2.24	62.12 ± 3.45	81.17 ± 4.12	18.96 ± 2.94
Middle of winter training	55.93 ± 2.64	66.22 ± 3.56	85.91 ± 4.95	21.86 ± 1.16
Late winter training	69.67 ± 3.69	81.34 ± 4.43	103.36 ± 5.91	22.54 ± 1 .22
F	2.268	1.414	1.126	0.574
P	0.114	0.252	0.332	0.568