Table 3

Between-group comparison (two-tailed independent t tests) of coefficient of variations of the temporal variables of the injured limb of the hamstring-injured group and the bilateral average of the control group during the transition from double- to single-leg stance

Dependent variable/muscle groupHamstring-injured group injured sideControl group bilateral averageMean differences (95% CI)*p Value
nMean (95% CI)nMean (95% CI)
Time (%)
 Reaction time1619.53 (14.93 to 24.12)1822.12 (17.75 to 26.50)−2.59 (−9.19 to 4.00)0.429
 Movement time168.72 (7.05 to 10.38)1810.19 (8.62 to 11.75)−1.47 (−3.85 to 0.90)0.216
Muscle onsets relative to anticipatory postural adjustment (%)
 Gastus medialis15174.92 (61.32 to 288.52)17121.75 (79.57 to 163.92)53.17 (−67.80 to 183.15)0.401
 Gluteus maximus1572.09 (−12.31 to 156.49)1848.52 (17.62 to 79.43)23.57 (−63.80 to 110.94)0.586
 Biceps femoris16139.40 (72.55 to 206.25)18105.00 (61.36 to 148.65)34.39 (−46.82 to 115.61)0.395
 Medial hamstrings16187.09 (105.82 to 268.37)18139.91 (100.29 to 179.54)47.18 (−43.55 to 137.90)0.297
 Vastus lateralis15171.22 (91.65 to 250.79)18174.39 (94.72 to 254.06)−3.17 (−121.354 to 115.01)0.957
 Rectus femoris15174.95 (16.33 to 333.56)17183.08 (96.61 to 269.55)−8.13 (−190.43 to 174.16)0.928
 Vastus medialis15110.09 (64.05 to 156.14)18167.32 (89.48 to 245.15)−57.22 (−156.29 to 41.84)0.248
  • * Positive value: the hamstring-injured group variable has a larger mean CV than the control group variable.

  • Equal variances not assumed.

  • Movement time, time from visual signal to foot being lifted off force platform; Reaction time, time from visual signal to anticipatory postural adjustment.