A Study on the Characteristics of Lumbar Muscle Fatigue during Repeated Lifting Operations in Confined Space
Objective To explore the effect of repetitive lifting operations by maintenance personnel in highly confined spaces on the fatigue characteristics of lumbar muscles.Methods Based on the background of rocket load-ing homework,12 healthy college students were recruited to participate in the experiment.Surface electromyography,back force meter,and Borg's RPE scale were used to record the surface electromyography,muscle strength,and subjec-tive fatigue data of the subjects,and the development characteristics of muscle fatigue during the homework process were analyzed.Results During the entire process of simulating rocket loading,the MVE%and RPE values showed an upward trend with the extension of loading time,while the waist muscle strength and medium frequency(MF)val-ues showed a downward trend;Repeated measurement variance was used to analyze the lumbar muscle strength,MVE%,and MF values.Compared with before the experiment,significant differences in muscle strength were observed after 20 minutes(P＜0.05).The MVE%values of the left erector spinalis and multifidus muscles showed significant differences at 10 minutes,while the right erector spinalis and multifidus muscles showed significant differences at 15 minutes(P＜0.05).The MF values of the left and right erector spinalis muscles showed significant differences start-ing from the 15th minute(P＜0.05),The left multifidus muscle showed a significant difference starting from the 10th minute(P＜0.05),while the MF value of the right multifidus muscle showed a significant difference starting from the 20th minute(P＜0.05);Through paired t-test analysis,the fatigue level of the left erector and multifidus muscles was greater than that of the right,and the multifidus muscles were greater than the erector muscles.Conclusion Dur-ing repeated lifting operations in a confined vertical space environment,fatigue of the erector and multifidus muscles can be induced.The multifidus muscles experience fatigue before the erector muscles,resulting in a significant de-crease in lumbar muscle strength,which can easily lead to work-related musculoskeletal diseases.It is recommended that maintenance personnel carry out lifting operations,arrange reasonable rest,engage in appropriate activities to alle-viate muscle fatigue during work,and strengthen core waist exercises in daily physical training.
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