Effect of change in dorsiflexion angle of ankle joint on center of gravity position during crouching motion

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  • Miyazaki Tomiko
    Division of Physical Therapy, Kochi Professional University of Rehabilitation
  • Kashiwa Tomoyuki
    Division of Physical Therapy, Kochi Professional University of Rehabilitation
  • Inaoka Tadakatsu
    Division of Physical Therapy, Kochi Professional University of Rehabilitation
  • Yamasaki Hiroshi
    Division of Physical Therapy, Kochi Professional University of Rehabilitation

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  • 足関節背屈角度の変化がしゃがみ込み動作時の重心位置に及ぼす影響

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Abstract

In this study, we investigated the effect of stretching to improve the dorsiflexion angle on the anterior-posterior center of gravity position during the crouching motion. The subjects were 15 healthy adults who were able to crouch down completely. The mean center of gravity position during the crouching motion was examined by the center of gravity sway test. After the test, the subjects were asked about the difficulty of the crouching motion using the Numerical Rating Scale. Then, the bilateral passive dorsiflexion angles were measured. Static stretching of the right and left soleus muscles were performed for two sets of 30 seconds. The mean anterior-posterior center of gravity position during the crouching motion and the difficulty of the crouching motion, the bilateral dorsiflexion angles were investigated again. Stretching significantly increased the dorsiflexion angle from 43.1±5.8 degrees to 44.6±5.9 degrees (p＜0.01). Similarly, the anterior-posterior center of gravity during the crouching motion moved significantly forward from -1.9±2.9cm before stretching to -0.5±3.2 cm after stretching (p＜0.01). The difficulty of crouching motion decreased significantly from 9(1) before stretching to 5 (4) after stretching (p＜0.01). There was a significant correlation (r=0.590) between the amount of change in dorsiflexion angle and the amount of change in the position of the center of gravity in front and behind (p＜0.05). These results suggest that increasing the dorsiflexion angle improves the backward center of gravity deviation during the crouching motion.

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