Kim Suwhan, Park Won-Ju, Cho Seunghyeon, Lim Dae-Young, Yoo Yeongjae, Kim Hyeonjun, Kang Wonyang, Kang Kyung Wook, Moon Jai-Dong
Department of Occupational and Environmental Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Korea.
Institute of Occupation and Environment, Korea Workers' Compensation & Welfare Service, Incheon, Korea.
Ann Occup Environ Med. 2021 Aug 13;33:e26. doi: 10.35371/aoem.2021.33.e26. eCollection 2021.
Previous studies have shown that morning types are less sensitive to pain. This study aimed to examine the relationship between chronotypes and musculoskeletal problems in workers with musculoskeletal burdens at work.
This cross-sectional study included 119 male production workers from a large automobile manufacturing plant. All the participants worked 2 shifts and worked on the automobile assembly line. Data were obtained using structured questionnaires, including the reduced Morningness-Eveningness Questionnaire (rMEQ), and musculoskeletal symptom questionnaire. Participants with an rMEQ score of 18 points or more were defined as morning-type workers (MTWs). Participants whose scores were less than 18 points were defined as neither-type workers (NTWs).
The arithmetic mean age was 51.8 ± 5.3 years. MTWs and NTWs accounted for 35.3% and 64.7% of the total participants, respectively. Evening- and intermediate-type workers accounted form 6.7% and 58.0% of the participants, respectively. There was no significant difference in the health indicators when the MTW and NTW groups were compared. However, the musculoskeletal symptom questionnaire demonstrated a significant difference between the MTW and NTW groups. In the preceding year, the MTW group had significantly lower musculoskeletal pain and treatment ratios compared to the NTW group (35.7% vs. 62.3%, = 0.005 and 14.3% vs. 32.5%, = 0.031, respectively). After adjusting for variables, the odds ratio (OR) for musculoskeletal pain was significantly higher in the NTW group than in the MTW group (OR, 3.112; 95% confidence interval, 1.285-7.535; = 0.012).
In this study, the musculoskeletal pain ratio was significantly lower for MTWs when compared to NTWs. Chronotypes could play an important role in work-related musculoskeletal disorders. Further, larger-scale, follow-up studies on chronotypes are required to assist in the prevention of musculoskeletal disorders in future.
先前的研究表明，早起型的人对疼痛不太敏感。本研究旨在探讨在工作中承受肌肉骨骼负担的工人的昼夜节律类型与肌肉骨骼问题之间的关系。
这项横断面研究纳入了一家大型汽车制造工厂的119名男性生产工人。所有参与者都上两班，在汽车装配线上工作。使用结构化问卷收集数据，包括简化的晨型-夜型问卷（rMEQ）和肌肉骨骼症状问卷。rMEQ得分18分及以上的参与者被定义为早起型工人（MTW）。得分低于18分的参与者被定义为非特定类型工人（NTW）。
算术平均年龄为51.8±5.3岁。MTW和NTW分别占总参与者的35.3%和64.7%。晚睡型和中间型工人分别占参与者的6.7%和58.0%。比较MTW组和NTW组时，健康指标没有显著差异。然而，肌肉骨骼症状问卷显示MTW组和NTW组之间存在显著差异。在前一年，MTW组的肌肉骨骼疼痛和治疗率显著低于NTW组（分别为35.7%对62.3%，P = 0.005；14.3%对32.5%，P = 0.031）。在对变量进行调整后，NTW组肌肉骨骼疼痛的优势比（OR）显著高于MTW组（OR，3.112；95%置信区间，1.285 - 7.535；P = 0.012）。
在本研究中，与NTW相比，MTW的肌肉骨骼疼痛率显著更低。昼夜节律类型可能在与工作相关的肌肉骨骼疾病中起重要作用。此外，需要对昼夜节律类型进行更大规模的随访研究，以协助未来预防肌肉骨骼疾病。
