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Table 4 Heart rate variability (HRV) parameters with or without soundproof mattress (M) under various floor impact sound

From: The responses of subjective feeling, task performance ability, cortisol and HRV for the various types of floor impact sound: a pilot study

   B T I BT TI BI p-value*
HR With mattress 84.05 ± 8.25 81.10 ± 7.20 83.58 ± 6.78 81.04 ± 7.30 81.92 ± 7.52 82.22 ± 6.89 0.025
Without mattress 81.28 ± 1.93 81.65 ± 2.22 83.69 ± 1.79 80.41 ± 1.94 81.11 ± 1.95 82.86 ± 1.87 <0.001
SDNN With mattress 20.66 ± 6.46 24.08 ± 7.06 20.85 ± 5.31 23.30 ± 6.44 21.94 ± 7.51 22.60 ± 6.42 0.013
Without mattress 26.44 ± 16.01 22.84 ± 7.47 20.54 ± 6.21 22.73 ± 5.96 22.95 ± 7.64 20.48 ± 6.99 0.248
TP With mattress 381.98 ± 263.46 559.24 ± 342.65 373.79 ± 156.62 473.85 ± 240.66 442.89 ± 283.62 485.09 ± 253.14 0.014
Without mattress 849.46 ± 1307.7 507.60 ± 311.38 399.75 ± 246.66 462.79 ± 215.36 506.86 ± 335.45 382.88 ± 240.84 0.261
LF With mattress 138.55 ± 104.63 213.46 ± 132.68 136.30 ± 56.39 170.19 ± 91.63 159.00 ± 101.34 187.27 ± 114.29 0.030
Without mattress 382.20 ± 718.90 180.23 ± 113.28 147.89 ± 94.28 167.41 ± 66.61 199.74 ± 153.35 138.48 ± 88.66 0.274
HF With mattress 243.43 ± 162.08 345.79 ± 213.76 237.48 ± 105.91 303.68 ± 161.93 283.85 ± 187.12 297.79 ± 157.14 0.013
Without mattress 467.25 ± 595.76 327.36 ± 210.34 251.88 ± 156.28 295.35 ± 159.69 307.12 ± 193.18 244.40 ± 160.45 0.245
LF/HF With mattress 0.51 ± 0.14 0.55 ± 0.11 0.52 ± 0.11 0.52 ± 0.13 0.52 ± 0.16 0.52 ± 0.15 0.900
Without mattress 0.57 ± 0.24 0.54 ± 0.16 0.54 ± 0.09 0.54 ± 0.14s 0.54 ± 0.15 0.58 ± 0.13 0.744
  1. Abbreviation: B bang machine, T tapping machine, I impact ball, BT B and T, TI T and I, BI B and I, HR heart rate, SDNN standard deviation normal to normal, TP total power, LF low frequency, HF high frequency
  2. Unit: Mean ± standard deviation
  3. *p-value was calculated by repeated measures ANOVA