Analysis on local muscle fatigue in lifting work by surface electromyography
- Author:
YUYing jie HUANGXin yu WANGYi jun JIANGGao feng WANGZhen yu WULei
- Publication Type:Journal Article
- Keywords:
Surfaceelectromyography Fatigue Liftingwork Muscle Erectorspinale Multifidusmuscle Influencingfactor
- From:
China Occupational Medicine
2022;51(03):254-
- CountryChina
- Language:Chinese
-
Abstract:
Abstract: Objective
To investigate the effect of lifting operation on fatigue susceptibility of local muscles under different
Methods
liftingmass,frequencyandangle. Fifteenmalecollegestudentvolunteerswereselectedasthestudysubjectsusinga-
purerandomsamplingmethod.Eightkindsofliftingoperations(setasA Hoperationgroup)wereperformedunderthespecified
mass (5 and 10 kg), frequency (10 and15 times/min) and angle (45° and 90°), five minutes each. The percentage of maximum
voluntaryelectricalactivation(MVE%)andaveragepowerfrequency(MPF)oferectorspinaeandmultifidusmuscleatmaximumResultsvoluntarycontractionweremeasuredbysurfaceelectromyography.TherewasanassociationbetweentheleftandrightP0.05).Theresults
ofmultiplelinearregressionanalysisshowedthattheprimaryinfluencingfactoroffatigueofleftandrighterectorspinaeandleft
multifidusmusclewasfrequency,followedbyquality,andtheinfluencingfactorsoffatigueofrightmultifidusmuscleweremass,
angleandfrequencyindescendingorder.TherewasnosignificantdifferenceinMPFvalueofGgroupwiththechangeofliftingPP0.05),butthereweresignificantdifferencesinMPFvalueofothergroupswiththechangeofliftingtimes(all0.01).
ThelinearregressiondeclineofMPFwasthemostobviouswiththechangeofliftingtimeswhentheliftingweightwas 10kg,the
Conclusion
frequency was 10 times/min, and the angle was 90°. In the lifting operation of left turn, the erector spinae and
multifidusmusclesaremostlikelytobecomefatiguewith 10kgliftingmass,10timesperminfrequency,and90°angle.Lifting
