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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.