Table 6.

The effect size of the muscle strength at different periods

Period	HGS			IS			QFS			TAS			HS
	TC	WBV	Con	TC	WBV	Con	TC	WBV	Con	TC	WBV	Con	TC	WBV	Con
0–4  weeks	0.07	0.22	0.05	0.52b	0.09	0.03	0.69b	0.31	0.03	0.28	0.63b	0.05	0.14	0.56	0.02
0–8  weeks	0.09	0.63b	0.08	0.84a	0.22	0.05	0.95a	0.81a	0.02	0.81a	0.85b	0.10	0.34	1.00a	0.11
4–8 weeks	0.10	0.33	0.03	0.22	0.12	0.01	0.37	0.33	0.05	0.36	0.20	0.05	0.21	0.39	0.13

The differences in the effect size using Cohen’s d for all outcomes

TC the Tai Chi group, WBV the whole-body vibration group, CON the control group, HGS handgrip strength, IS iliopsoas strength, QFS quadriceps femoris strength, TAS tibialis anterior muscle strength, HS hamstring muscle strength

^aThe effect size larger than 0.80, ^bthe effect size larger than 0.50