Table 2.

Variation of postural sway parameters before and after the Wii training for bipedal stance in eyes-open and eyes-closed conditions.

	Eyes open			Eyes closed			Time effect p value	Vision effect p value	Time × vision interaction p value
	Pre-Wii	Post-Wii	Pre-post change	Pre-Wii	Post-Wii	Pre-post change
Sway area (mm2)	340.68 ± 197.82	275.85 ± 195.73	−64.83 ± 75.62	502.08 ± 337.78	389.44 ± 339.54	−97.96 ± 199.44	0.004†	0.002†	0.482
COP path length (mm)	469.85 ± 142.91	463.52 ± 163.92	−6.33 ± 84.54	700.95 ± 308.83	668.12 ± 330.90	−26.52 ± 159.63	0.502	<0.001†	0.521
COP max disp. ML (mm)	25.12 ± 9.54	22.36 ± 9.00	−2.76 ± 5.43	31.82 ± 13.66	25.98 ± 11.15	−5.13 ± 6.67	0.003†	0.003†	0.131
COP max disp. AP (mm)	29.38 ± 6.68	29.18 ± 10.08	−0.21 ± 6.66	39.02 ± 9.67	37.26 ± 13.98	−1.30 ± 11.47	0.629	<0.001†	0.704
COP velocity ML (mm s−1)	8.94 ± 2.89	8.07 ± 3.20	−0.86 ± 1.83	12.29 ± 5.60	11.09 ± 5.78	−0.96 ± 2.72	0.041†	<0.001†	0.932
COP velocity AP (mm s−1)	10.78 ± 3.86	8.11 ± 3.20	−2.16 ± 5.19	17.02 ± 7.87	16.72 ± 8.77	−0.25 ± 4.77	0.892	<0.001†	0.507

All values are expressed as mean ± SD. Pre-Wii: baseline values, Post-Wii: after 5 weeks of balance training with Nintendo Wii. The symbol ^†denotes statistical significance (p < 0.05).