Table 2.

Changes in HRV between Placebo and OFI group after the cycle ergometer test

	Group	Pre test	Post test	24 h-post test	48 h-post test
LF (ms2)	Placebo	66.86 ± 7.09	66.21 ± 8.04	66.91 ± 8.20a	65.12 ± 3.87
	OFI	62.79 6.04c	66.90 ± 10.37d	52.83 ± 4.47acd	58.11 ± 5.78
HF (ms2)	Placebo	33.00 ± 7.03	28.74 ± 2.72	32.98 ± 8.20	33.02 ± 4.46
	OFI	33.38 ± 3.52	34.31 ± 9.31	31.39 ± 4.39	36.81 ± 8.54
LF/HF	Placebo	2.15 ± 0.69	2.32 ± 0.33	2.20 ± 0.83	2.01 ± 0.33
	OFI	1.90 ± 0.26	2.11 ± 0.68	1.71 ± 0.23	1.69 ± 0.58
RMSSD	Placebo	51.68 ± 7.40	42.18 ± 9.64	46.55 ± 9.20	45.53 ± 7.93b
	OFI	59.40 ± 8.44e	48.63 ± 6.18ef	54.85 ± 9.44	58.48 ± 7.84bf

All data are presented as means±SD. LF Low Frequency, HF High Frequency, LF/HF Low-high frequency ratio; rMSSD Root Mean Square of the Successive Differences. a,b,c,d,e and f denote significant differences (p < 0.05) between groups and within the same group