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Table 4 Linear and non-linear parameters of the heart rate variability at rest, immediately after, 1 h after and 24 h after the resistance training protocols

From: Acute effects of different resistance training loads on cardiac autonomic modulation in hypertensive postmenopausal women

Variables Groups Rest After 1 h 24 h
rMSSD (ms) Control 21.51 ± 14.26 27.38 ± 18.93* 33.50 ± 22.17* 28.60 ± 29.24
6RM 26.50 ± 16.92 23.12 ± 18.58 22.24 ± 14.88* 21.51 ± 14.97*
15RM 21.26 ± 13.05 12.62 ± 16.33*† 17.74 ± 11.16 24.08 ± 22.91
LF (μn) Control 54.60 ± 18.55 54.82 ± 17.82 48.17 ± 22.15 53.05 ± 26.47
6RM 54.80 ± 22.56 53.82 ± 21.16 54.94 ± 20.11 53.99 ± 19.24
15RM 53.62 ± 22.88 64.74 ± 20.68* 60.40 ± 18.07 58.78 ± 18.16
HF (μn) Control 45.30 ± 18.61 45.10 ± 17.83 51.60 ± 21.95 46.83 ± 26.40
6RM 45.06 ± 22.62 46.04 ± 21.11 44.94 ± 20.07 45.96 ± 19.21
15RM 46.26 ± 22.82 34.26 ± 21.39* 39.45 ± 18.04 41.09 ± 18.10
LF/HF Control 1.58 ± 1.20 1.61 ± 1.35 1.49 ± 1.75 2.08 ± 2.27
6RM 1.90 ± 1.72 1.72 ± 1.49 1.60 ± 1.11 1.70 ± 1.72
15RM 2.10 ± 2.76 3.63 ± 3.32†‡ 2.25 ± 2.06 1.90 ± 1.38
ApEn Control 1.14 ± 0.13 1.14 ± 0.15 1.07 ± 0.16 1.11 ± 0.16
6RM 1.14 ± 0.16 1.17 ± 0.23 1.09 ± 0.17 1.16 ± 0.19
15RM 1.16 ± 0.10 1.22 ± 0.20 1.17 ± 0.08†‡ 1.12 ± 0.18
  1. Values expressed as mean ± standard deviation. rMSSD square root of the square mean of the differences between the adjacent normal RR intervals, expressed in milliseconds, high frequency HF, expressed in standard units, LF low frequency, expressed in normalized units, LF/HF ratio high/low frequency, Ap En approximate Entropy
  2. * Significantly different from pre-intervention (p ≤ 0.05).  Significantly different from the control session (p ≤ 0.05).  Significantly different from the 6RM session (p ≤ 0.05)