Table 2. Changes in passive range of motion of the three groups.

	T1	T2	T3	T4	T5
US	41.6 ± 9.1	40.5 ± 8.0	46.8 ± 9.9** †	47.3 ± 9.8** ††	47.0 ± 9.5* ††
Placebo	41.0 ± 8.5	41.7 ± 7.9	40.6 ± 7.1	40.4 ± 5.9	41.2 ± 6.5
Control	39.9 ± 8.7	41.2 ± 8.4	39.6 ± 8.2	41.0 ± 8.5	42.3 ± 8.1

Unit: degrees (°) (mean ± SD). ** p < 0.01 (US vs. control); * p < 0.05 (US vs. control). †† p < 0.01 (US vs. placebo); † p < 0.05 (US vs. placebo). The chronological changes in passive range of motion in the US, placebo, and control groups are shown. From T3 to T5, passive range of motion was significantly higher in the US group than in the placebo and control groups.