Table 1.

Correlation coefficients between sequential steps over the obstacle and movement and EMG parameters

Condition	Height	AN	KN	HI	RF	BF	TA	GM	Step t	Swing t	Mean r
1 VIS	−0.315	−0.525	−0.499	−0.524	−0.347	−0.338	−0.332	−0.208	0.179	0.089	−0.29
2 VIS	0.017	−0.245	−0.132	−0.198	−0.123	−0.106	0.008	−0.036	0.135	0.069	−0.06
3a ACU	−0.117	−0.455	−0.383	−0.443	−0.226	−0.25	−0.36	−0.362	−0.302	−0.38	−0.33
3b SOM	−0.183	−0.416	−0.243	−0.209	−0.197	−0.283	−0.149	−0.083	−0.3	−0.38	−0.25
1 ACU	−0.285	−0.489	−0.519	−0.54	−0.316	−0.449	−0.303	−0.314	−0.23	−0.188	−0.37
2 ACU	−0.087	−0.233	−0.205	−0.18	−0.092	−0.147	−0.153	−0.212	−0.126	−0.178	−0.16
3a VIS	−0.109	−0.31	−0.262	−0.224	−0.202	−0.2	−0.284	−0.212	0.082	0.056	−0.17
3b SOM	0.044	0.012	−0.116	−0.114	−0.107	−0.167	0.111	−0.117	−0.084	−0.077	−0.06
3c LED	−0.169	−0.401	−0.434	−0.354	−0.282	−0.318	−0.263	−0.346	−0.014	0.02	−0.26

Correlations between sequential steps over the obstacle and the foot clearance over the obstacle (height), the variation ratio of the ankle (AN), knee (KN) and hip (HI) angle trajectories, the root mean square of rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA) and gastrocnemius medialis (GM) muscles, the duration of the whole step over the obstacle (Step t) and the duration of the swing phase over the obstacle (Swing t). Conditions: visual (VIS), somatosensory (SOM), acoustic (ACU) and light flash (LED) stimulus condition for the stimulus sequences VIS–VIS followed by SOM or ACU and ACU–ACU followed by VIS, SOM or LED. Correlation coefficients<0.2 are in bold. Negative correlation coefficients indicate a reduction of the value during the repetitive movements over the obstacle.