Subjective and objective assessments after a change from a 4-crew, 12-h shift to a 3-crew, 12-h shift schedule: an obser
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ORIGINAL ARTICLE
Subjective and objective assessments after a change from a 4‑crew, 12‑h shift to a 3‑crew, 12‑h shift schedule: an observational study Kiyoshi Tadakuma1 · Takashi Maruyama2 · Koji Mori1 · Nobuhiro Fujiki3 Received: 8 September 2019 / Accepted: 25 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose To clarify the subjective and objective impacts of a change in a 12-h shift schedule, involving a reduction in the number of crews, on workers at an electronic parts production company. Methods Forty-two workers participated in this study. Subjective indicators (e.g. questionnaires) and objective indicators [e.g., psychomotor vigilance task (PVT)], as well as an activity monitor-based sleep assessment, were measured during a > 1-year period that encompassed the shift schedule change. The study outcome was a comparison of work-related injury rates measured 1 year before and after the change in shift schedule. Results After the shift schedule change, questionnaire scores regarding work-related burdens and PVT performance parameters, including mean response time and number of lapses, increased significantly. However, we also observed divergences in the trends of the subjective and objective measures 1 year after the change. Despite these variations in both types of measures, we observed no significant differences in work-related injury rates measured before and after the shift schedule change. Conclusion This study revealed that a reduction in the number of crews in a 12-h shift schedule has a negative impact on the subjective and objective indicator after the change in shift schedule; only indicators of alertness did not recover at 1 year after the change. Assessments of the workers’ performances and the regular implementation of health and safety programs for more than 1 year are needed to maintain workers’ health after the change in shift schedule. Keywords Work-related injury · Fatigue · Shift work · Psychomotor vigilance task · Alertness · Sleepiness
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00420-020-01561-2) contains supplementary material, which is available to authorized users. * Takashi Maruyama [email protected]‑u.ac.jp 1
Occupational Health Practice and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan
2
Department of Physiology, University of Occupational and Environmental Health, 1‑1 Isegaoka, Yahatanishi‑ku, Kitakyushu, Fukuoka 8078555, Japan
3
Department of Ergonomics, Institute of Industrial and Ecological Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan
Shift work is a scheduling practice used widely in various industries that require continuous (i.e., 24-h) operations, such as manufacturing. In such contexts, increasing the number of shift workers has enhanced production processes and improved productivity. In Japan, an estimated 6.38 million workers ar
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