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

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)

Dependent variables		Forward translation			Backward translation
S1–S2 period
CNV peak time (ms)	Simple	317.2 ± 208.3			270.1 ± 198.8
CNV peak time (ms)	Choice	326.3 ± 205.6			229.4 ± 142.9
CNV peak amplitude (μV)	Simple	10.5 ± 4.4			9.9 ± 4.8
CNV peak amplitude (μV)	Choice	10.9 ± 5.7			9.4 ± 4.4
After S2
CoPap displaced position (%FL)	Simple	0.0 ± 6.4			− 7.0 ± 8.6
CoPap displaced position (%FL)	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
Onset time of postural muscle (ms)	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
Peak time of postural muscle (ms)	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
Peak amplitude of postural muscle (μV)	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

Mean ± SD
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

ISSN: 1880-6805