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KMID : 1211620170120040113
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Journal of the Korean Society of Physical Medicine
2017 Volume.12 No. 4 p.113 ~ p.122
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A Comparison of Muscle Activation and Mechanical Loading according to the Degree of Ankle Joint Motion during a Sit-to-stand Task
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Lee Myung-Mo
Park Dae-Sung
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Abstract
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PURPOSE: The purpose of this study was to investigate the comparison of muscle activity and mechanical loading according to the angle of ankle joint during a sit-to-stand (STS) task.
METHOD: Thirty-four young participants performed the STS in a randomized trial with the ankle joint at a neutral, 15 degrees dorsiflexion and 15 degrees plantarflexion angle in a fixed sitting posture with the knee in 105 degrees flexion. Muscle activity of the tibialis anterior (TA), rectus femoris (RF), biceps femoris (BF), and gastrocnemius medialis (GCM) was measured, and the parameters calculated in relation to mechanical loading were the STS-time, maximum peak , minimum peak, and total sum of mechanical loading.
RESULTS: In the dorsiflexion position, the muscle activity of the TA and GCM showed a significant increase (p〈 .05), and the STS time, maximum peak and total sum of mechanical loading showed a significant difference compared to that in the neutral position (p〈 .05). In the plantarflexion position, the muscle activity of the RF and GCM showed a significant increase (p〈 .05), while that of the TA showed a significant decrease (p〈 .05) compared to that in the neutral position. And the minimum peak was significantly increased than the neutral position (p〈 .05), and the maximum peak and total sum of mechanical loading were showed significant difference compared with dorsiflexion position (p<.05).
CONCLUSION: These results show that there is a difference in muscle activity and mechanical loading when performing the STS movement according to the change in the ankle joint angle.
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KEYWORD
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Ankle joint, Electromyography, Range of motion, Time and motion studies
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