Table 1.
Measured variables during the measurement of joint stiffness (i.e., drop jump). Mean (SD).
| Experimental condition | Control condition | |||
|---|---|---|---|---|
| Before | Aftera | Before | After | |
| Duration of contact (msec) | 338.7 (34.9) | 385.2 (38.5) *** | 342.0 (36.6) | 336.0 (37.1) |
| Angular velocity during eccentric phase (deg·sec−1) | 128.3 (27.6) | 137.1 (28.8) | 134.9 (28.8) | 135.4 (27.4) |
| Angular velocity during concentric phase (deg·sec−1) | 184.2 (26.6) | 166.2 (35.6) | 184.6 (33.0) | 187.9 (26.9) |
| mEMG of PF during prelanding (mV·sec−1) | 0.087 (0.045) | 0.086 (0.045) | 0.099 (0.057) | 0.081 (0.077) |
| mEMG of PF during eccentric phase (mV·sec−1) | 0.200 (0.063) | 0.217 (0.060) | 0.194 (0.051) | 0.206 (0.072) |
| mEMG of PF during concentric phase (mV·sec−1) | 0.188 (0.069) | 0.184 (0.073) | 0.202 (0.076) | 0.198 (0.059) |
| mEMG of TA during prelanding (mV·sec−1) | 0.075 (0.044) | 0.052 (0.035) | 0.064 (0.032) | 0.074 (0.048) |
| mEMG of TA during eccentric phase (mV·sec−1) | 0.098 (0.073) | 0.072 (0.037) | 0.113 (0.058) | 0.109 (0.022) |
| mEMG of TA during concentric phase (mV·sec−1) | 0.089 (0.040) | 0.055 (0.013) | 0.070 (0.039) | 0.094 (0.046) |
| Peak torque during eccentric phase (Nm) | 261.6 (32.3) | 248.3 (33.7) | 257.7 (36.4) | 260.3 (32.2) |
| Range of motion during eccentric phase (deg) | 21.3 (5.5) | 24.0 (5.0) ** | 22.6 (6.5) | 22.9 (5.9) |
| Joint stiffness (Nm·deg−1) | 13.7 (4.0) | 10.9 (2.9) ** | 12.3 (3.8) | 12.1 (3.0) |
| Fascicle shortening during eccentric phase (mm) | 5.8 (3.4) | 1.0 (2.8) *** | 6.3 (2.0) | 6.7 (2.3) |
| Fascicle shortening during concentric phase (mm) | 6.8 (2.6) | 7.9 (3.3) | 6.5 (1.6) | 7.2 (2.5) |
MEMG, mean electromyographic activities, PF, plantar flexor muscles, TA, tibial anterior muscle.
a
Significantly different from before (**P < 0.01, ***P < 0.001).