Table 2. Muscle activity was compared between the NSP and the FSP at knee flexion angle of 30,60 and 90degrees. Muscle activity was normalized using the integrated EMG at maximum voluntary isometric contraction. Values are means (±SD).
Knee Flexion 30° Knee Flexion 60° Knee Flexion 90°
NSP FSP NSP FSP NSP FSP
VM (%) 16.65(6.79) 10.09(5.59) 43.19(11.01) 23.14(11.48) 83.78(19.23) 52.22(14.06)
ST (%) 7.35(4.62) 32.62(15.20) 7.64(4.81) 27.69(17.75) 14.76(10.17) 17.81(11.62)
TA (%) 3.79(5.61) 8.88(5.16) 22.78(22.65) 11.73(12.73) 45.41(22.65) 15.23(16.19)
GL (%) 5.20(2.60) 24.01(15.97) 5.00(2.29) 15.74(5.51) 7.49(4.05) 13.29(5.48)
†: Significant differences from FSP condition (p < 0.05).
NSP: Normal Squat Posture, FSP: Forward-Shifted Posture, VM: Vastus Medialis, ST: Semitendinosus, TA: Tibialis Anterior, GL: Gastrocnemius Lateral head,