Contribution of Interaction Torque in the Sit-to-Stand Motion
In whole-body movement such as the sit to stand motion, greater interaction torque may be produced compared to arm movements, since this torque is greatly dependent on segment weight and angular acceleration. However, the contribution of interaction torques and muscle torques to net torque in whole-...
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Veröffentlicht in: | Baiomekanizumu Gakkai shi 2010, Vol.34(3), pp.240-247 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In whole-body movement such as the sit to stand motion, greater interaction torque may be produced compared to arm movements, since this torque is greatly dependent on segment weight and angular acceleration. However, the contribution of interaction torques and muscle torques to net torque in whole-body movement has not been explored. The purpose of this study was to analyze the multijoint dynamics of the sit to stand motion. Subjects were 10 healthy men with a mean age of 20.4±0.7 years. We set 2 conditions: preferred speed and fast speed. Net torque, interaction torque, muscle torque, gravity torque were obtained according to a Lagrange equation with 3 segment model, and the torque of chair’s reaction force were determined with the measurement of ground reaction force. The relative contribution of INT to NET was also calculated. Electromyography was recorded from 5 muscles on both sides: gluteus maximus; biceps femoris; vastus medialis; tibialis anterior and soleus. Results showed that interaction torque greatly contributed to producing actual movements for whole-body anti-gravity movement like the sit-to-stand motion. Moreover, muscle torque of hip joint primarily determined initial acceleration. This phenomenon was termed the “hip-centered pattern”. |
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ISSN: | 0285-0885 |
DOI: | 10.3951/sobim.34.240 |