| Summary: | 碩士 === 國立成功大學 === 物理治療研究所 === 95 === Background and purpose: Sit-to-stand movement is an important functional task in our daily life. Factors which would influence sit-to-stand movement are worth of investigation. Proprioceptive inputs from the ankle joint provide information regarding the foot placement, which is known to affect the sit-to-stand movement. Thus, the aim of this study was to investigate how additional proprioceptive inputs from bilateral sides and unilateral side of ankle joint affected the performance of sit-to-stand. Methods: 25 healthy young adults required to perform proprioceptive test and sit-to-stand test under 3 conditions: no vibration (NV), bilateral vibration (BV), and unilateral vibration (UV). Mechanical vibrators were placed on the Achilles tendons to induce erroneous proprioceptive inputs. In proprioceptive test, subjects with blindfold needed to point out the anterior site of big toe. In sit-to-stand test, subjects required to stand up with the blindfold and arms across the chest at their selected speeds. VICON system and force plate were used to collect performance of sit-to-stand. Results of proprioceptive test, and sit-to-stand characteristics including task duration, seat-off time, trunk inclination, maximum trunk segment forward velocity, maximum trunk segment forward acceleration, peak vertical ground reaction force, onset of peak vertical ground reaction force, and movement characteristics of center of pressure were used to analysis. Repeated measure ANOVA was used to compare the difference between three conditions. Significant level was p<0.05. Results: In proprioceptive test, subjects in BV showed erroneous sensation of foot placement which was posterior than real position. In sit-to-stand test, subjects in BV and UV showed earlier seat-off and onset of peak vertical ground reaction force than NV. BV and UV also show larger trunk inclination forward velocity and acceleration than NV. In addition, BV showed less COP trajectory and peak to peak range in medial-lateral direction than NV and UV. However, there was no significant difference between three conditions in task duration, trunk inclination forward displacement, and peak vertical ground reaction force. Conclusion: In this study, we found out vibration-induced erroneous proprioceptive inputs from bilateral ankle joints could cause illusory sensation of posterior foot placement. In addition, erroneous proprioceptive inputs from bilateral ankle joints could affect events onset and location of force application on sit-to-stand movement. On the other hand, though unilateral ankle joint vibration could not affect sensation of foot placement, it could modify the location of force application which shifted to the non-vibrated side on sit-to-stand. And we could apply the results on stroke patients to improve the use of affected-side lower limb.
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