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Rehabilitation Practice and Science

Translated Title

靜態持住姿勢肌群作用與共作用程度研究

Abstract

The object of this study is to examine co-activities of eight muscle group in various lifting conditions. A total of 40 voluntary subjects with no experience of low back pain participated in this experiment. The muscle activities of interested were bicep brachii, thoracic erector spinae, lumbar erector spinae, latissimus dorsi, external oblique, rectus abdominis, rectus femoris, and semitendinosus of the right side body. Surface EMG signals were obtained in static holding postures of 3 kneeing angles, 5 trunk flexion angles, 2 horizontal liftingdistances, and 3 loading conditions. After recording, the percentages of maximum voluntary contraction (NEMG) and relative activity level (RAL) were calculated as indications of level of participations in each individual level.Analysis of variance result indicated significant effects of the examined tasks variables on NEMGs and RALs (p＜0.05). Depends on concentric or eccentric joint motion, which either shorten or lengthen the examined muscle lengths, so as lead to an increase or decrease of the recorded EMG. Increase in EMG data can also attributed to an increase of external loads, an increase of horizontal holding distance, and the necessity of static contractions to maintain posture in balance. In addition, increase of trunk flexion angle decrease the horizontal moment arm of biceps and increase the length of semitendinosus so as increase their activation levels. Increase of knee flexion angle would restrict pelvis rotation and affect the linear relations between the trunk flexion angle and NEMG of the back muscles- This study constitutes an important part of understanding the feasibility of using surface EMG to examining muscle coactivation in functional posture of load holding.

Language

Traditional Chinese

First Page

51

Last Page

58

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