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. 2013 Nov 19;13:105. doi: 10.1186/1471-2261-13-105

Table 3.

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

  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

*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.