Table 4. Changes in heart rate variability.

Variables	Group	Pre	Post
SDNN (ms)	Exercise	25.5 ± 7.8	29.5 ± 6.4
	Control	23.4 ± 7.2	25.0 ± 5.7
rMSSD (ms)	Exercise	17.9 ± 5.4	19.9 ± 6.8
	Control	16.4 ± 5.9	16.5 ± 5.1
Low frequency (nu)	Exercise	51.6 ± 8.1	52.1 ± 7.2
	Control	49.9 ± 10.0	50.0 ± 10.3
High frequency (nu)	Exercise	47.3 ± 7.6	48.7 ± 7.1
	Control	44.0 ± 7.5	44.9 ± 6.5
LF/HF	Exercise	1.12 ± 0.3	1.1 ± 0.2
	Control	1.14 ± 0.2	1.1 ± 0.2

Values are mean ± SD. SDNN: standard deviation of normal to normal intervals, rMSSD: root mean square successive differences