Pre

(No) Stim.

Post 5

Post 10

Post 15

Control Group

HR (bpm)

72.0 ± 10.2

72.7 ± 6.2

73.9 ± 8.3

73.8 ± 8.3

72.8 ± 7.6

LF (msec2)

836.5 ± 126.6

737.3 ± 136.7

1054.1 ± 273.5

920.7 ± 194.3

974.0 ± 150.3

HF (msec2)

410.1 ± 91.5

386.8 ± 74.3

351.2 ± 72.1

325.1 ± 75.7

398.4 ± 88.7

LF/HF ratio

3.8 ± 1.0

5.3 ± 3.0

10.6 ± 6.7

8.2 ± 3.9

5.5 ± 2.3

Stimulation Group

HR (bpm)

74.3 ± 6.5

72.0 ± 6.8*

74.2 ± 7.1

73.0 ± 6.3

71.6 ± 7.8*

LF (msec2)

908.6 ± 157.8

1296.7 ± 325.4

855.8 ± 118.2

975.4 ± 130.6

1081.9 ± 236.2

HF (msec2)

374.9 ± 134.5

616.2 ± 263.3

368.2 ± 123.0

399.5 ± 90.5

457.5 ± 113.9

LF/HF ratio

8.4 ± 3.7

9.8 ± 6.3

9.1 ± 3.7

7.4 ± 4.0

6.1 ± 3.1