Abstract：Objective To investigate the relationship between working duration and work-related musculoskeletal disorders (WMSDs) among Internet enterprise employees. Methods Employees were randomly sampled from five Internet enterprises in Jiaxing City of Zhejiang Province using the cluster sampling method. Participants' demographics and working duration were collected using questionnaire surveys, and the fatigue accumulation and WMSDs were assessed using the Self-diagnosis Questionnaire for Fatigue Accumulation and the Musculoskeletal Disorders Questionnaire. The working duration per week was classified into 40 h and less, 40 to 48 h, 48 to 56 h and 56 h and longer, and more than 40 h working duration per week was defined as long working duration. The association between working duration and WMSDs was examined with a multivariable logistic regression model. Results Among 334 questionnaires recovered, 280 were valid, with an effective recovery rate of 83.83%. The participants included 211 men (75.36%) and 69 women (24.64%), and there were 204 participants at ages of less than 36 years (72.86%) and 234 participants with long working duration (83.57%). The detection of fatigue accumulation and WMSDs was 33.21% and 65.36% among the participants, with the highest prevalence of WMSDs detected in the neck (52.50%). Multivariable logistic regression analysis showed that weekly working duration correlated with WMSDs (>40 to 48 h, OR=2.199, 95%CI: 1.083-4.468; >56 h, OR=6.688, 95%CI: 1.902-23.520) after adjustment for gender, marital status and sleep disorders. If fatigue accumulation was included in the model, there was no statistical correlation between weekly working duration and WMSDs (P>0.05). Conclusion Long working duration may increase the risk of WMSDs among Internet enterprise employees, and fatigue accumulation may play a mediating role.
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