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Table 1 Means and standard deviations (SDs) of each parameter of contingent negative variation (CNV), electromyograms and center of pressure in the anteroposterior direction (CoPap)

From: Timings of attentional switching to perturbation and postural preparation during transient forward or backward floor translation

Dependent variables Forward translation Backward translation
S1–S2 period
 CNV peak time (ms) Simple 317.2 ± 208.3 270.1 ± 198.8
Choice 326.3 ± 205.6 229.4 ± 142.9
 CNV peak amplitude (μV) Simple 10.5 ± 4.4 9.9 ± 4.8
Choice 10.9 ± 5.7 9.4 ± 4.4
After S2
 CoPap displaced position (%FL) Simple 0.0 ± 6.4 − 7.0 ± 8.6
Choice 2.3 ± 5.5 − 8.4 ± 7.3
  RA RF TA ES BF GcM Sol
 Onset time of postural muscle (ms) Simple 144.5 ± 15.0 109.5 ± 15.1 94.4 ± 11.6 121.5 ± 14.9 110.5 ± 16.4 90.2 ± 8.2 78.6 ± 12.1
Choice 141.6 ± 15.5 109.2 ± 15.5 94.1 ± 12.1 120.5 ± 9.8 103.9 ± 11.2 88.2 ± 7.5 77.5 ± 8.3
 Peak time of postural muscle (ms) Simple 97.7 ± 115.7 90.5 ± 104.8 56.5 ± 18.5 68.2 ± 62.7 56.4 ± 30.6 34.2 ± 10.6 34.7 ± 18.5
Choice 106.8 ± 132.4 78.7 ± 92.3 49.2 ± 16.8 59.4 ± 37.9 66.0 ± 46.9 35.6 ± 6.0 35.3 ± 21.5
 Peak amplitude of postural muscle (μV) Simple 21.8 ± 16.0 63.0 ± 40.7 319.7 ± 107.5 41.8 ± 27.5 31.2 ± 15.7 194.3 ± 96.0 95.9 ± 32.9
Choice 16.1 ± 11.1 54.0 ± 31.3 290.5 ± 108.1 42.1 ± 21.3 33.7 ± 18.4 182.9 ± 84.7 86.4 ± 28.1
  1. Mean ± SD
  2. RA rectus abdominis, RF rectus femoris, TA tibialis anterior, ES erector spinae, BF biceps femoris, GcM medial head of gastrocnemius, Sol soleus, FL foot length