Analysis of the electromyographic characteristics on shoulder fatigue caused by lifting load / 中华劳动卫生职业病杂志
Chinese Journal of Industrial Hygiene and Occupational Diseases
; (12): 501-503, 2012.
Article
in Zh
| WPRIM
| ID: wpr-324209
Responsible library:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To analyze and evaluate the fatigue of shoulder skeletal muscle caused by different lifting loads with surface electromyography (sEMG).</p><p><b>METHODS</b>According to the loading standard of1 Repetition Maximum (1RM), ten male volunteers performed 3 tasks of upper limb flexion, i.e. 10%, 50% and 90%-1RM. During action process, the signals of Upper Trapezius (UT), Lower Trapezius (LT), Serratus Anterior (SA) and Anterior Deltoid (AD) were recorded by sEMG. The Mean Amplitude (MA) served as an index to evaluate the changes in skeletal muscle fatigue.</p><p><b>RESULTS</b>The scores of Borg were 15.6, 15.9 and 15.2 for 3 loads of 10%-1RM, 50%-1RM and 90%-1RM, respectively (P > 0.05). The mean amplitudes (MAs) of Upper Trapezius, Lower Trapezius, Anterior Deltoid and Serratus Anterior in shoulders increased obviously. Under the load intensity of 10%-1RM, the MAs of Upper Trapezius and Anterior Deltoid increased significantly (P < 0.05), which were 0.898 and 0.736, respectively. After the exhaustion, the contribution of mean amplitude in shoulder muscle did not change significantly (P > 0.05).</p><p><b>CONCLUSION</b>The low-load action for long time can induce easily the fatigue of upper trapezius and anterior deltoid.</p>
Full text:
1
Index:
WPRIM
Main subject:
Physiology
/
Shoulder
/
Workload
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Lifting
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Muscle, Skeletal
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Muscle Fatigue
/
Electromyography
Limits:
Adult
/
Humans
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Male
Language:
Zh
Journal:
Chinese Journal of Industrial Hygiene and Occupational Diseases
Year:
2012
Type:
Article