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. Author manuscript; available in PMC: 2011 Aug 10.
Published in final edited form as: J Biomech. 2010 May 20;43(11):2099–2105. doi: 10.1016/j.jbiomech.2010.04.003

Figure 5.

Figure 5

Contributions to mass center accelerations from the muscles providing the largest magnitude accelerations upward and downward and from gravity. The muscles that generated the largest upward acceleration of the mass center during crouch and unimpaired gait included gluteus maximus, gluteus medius, rectus femoris, vastus, gastrocnemius, and soleus. The muscles that accelerated the mass center downward included the iliopsoas, hip adductors, medial hamstrings, biceps femoris short head, and tibialis anterior. Accelerations are shown for single-limb stance from opposite toe-off (OTO) to opposite heel contact (OHC). The vectors represent the average up/down and forward/backward acceleration of the mass center at each 5% of single-limb stance for all subjects. The magnitude of the accelerations in the forward/backward directions has the same scale as the up/down accelerations shown on the vertical-axis. Skeletal alignment was calculated by subtracting the accelerations due to muscles from the accelerations due to the ground reaction force.