Table 2. Structural characteristics of the muscle groups. Data are presented as means (SEM).
KE KF EF
Pennation angle (°) 11.6 (0.2) 1.3 (0.1) * 0.9 (0.1) *#
Muscle volume (cm3) 1984(38) 754(38) * 390(15) *#
Total work (joule) 5737(327) 2669(198) * 1667(113) *#
Workload per unit muscle volume (Joule/cm3) 2.9 (0,.2) 3.6 (0.3) * 4.3 (0.3) *
KE: Knee extensor, KF: Knee flexor, EF: Elbow flexor.* p < 0.01 compared with KE,# p < 0.01 compared with KF.