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Table 3 Heart rate variability (mean ± SD) parameters in the control and experimental sessions

From: Resistance exercise leading to failure versus not to failure: effects on cardiovascular control

 

8 pm – 10 am

8 pm – 6 am

7 am – 10 am

Control session

   

  rMSSD (ms)

68.5 ± 31.2

67.4 ± 34.3

72.2 ± 28.9

  LF n.u. (%)

68.8 ± 8.7

70.0 ± 8.8

62.0 ± 11.9

  HF n.u. (%)

31.2 ± 8.7

30.0 ± 8.8

37.9 ± 11.9

  LF/HF

3.0 ± 1.8

3.2 ± 1.9

2.0 ± 1.0

60% of 10-RM session

   

  rMSSD (ms)

39.0 ± 16.8*

38.8 ± 17.3*

33.9 ± 15.4*

  LF n.u. (%)

68.4 ± 12.3

67.8 ± 12.0

74.3 ± 14.6

  HF n.u. (%)

31.6 ± 12.3

32.2 ± 12.0

25.7 ± 14.6

  LF/HF

3.1 ± 1.3

2.9 ± 1.1

4.2 ± 2.8

10-RM session

   

  rMSSD (ms)

43.6 ± 17.7*

41.8 ± 18.0*

44.7 ± 17.5*

  LF n.u. (%)

69.6 ± 4.6

68.1 ± 5.8

74.1 ± 7.6

  HF n.u. (%)

30.4 ± 4.6

31.9 ± 5.8

25.9 ± 7.6

  LF/HF

3.0 ± 0.6

2.8 ± 0.8

3.7 ± 1.5

  1. *p ≤ 0.05 vs control session. rMSSD = root mean square of the squared successive differences between the adjacent R-R intervals; LF = low-frequency component; HF = high-frequency component (rMSSD, LF and HF reflecting a parasympathetic regulation). LF/HF ratio signifies the overall balance between sympathetic and parasympathetic systems.10-RM = ten repetitions maximum.