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Circadian rhythm of wrist temperature among shift workers in South Korea: A prospective observational study
- Circadian rhythm of wrist temperature among shift workers in South Korea: A prospective observational study
- Jang T.-W.; Kim H.; Kang S.-H.; Choo S.-H.; Lee I.-S.; Choi K.-H.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- International Journal of Environmental Research and Public Health
- vol. 14, no. 10
- Body temperature; Circadian rhythm; Cosinor analysis; Shift work; Wrist temperature
- MDPI AG
- Background: Human body temperature varies with circadian rhythm. To determine the effect of shift work on the circadian rhythm of the distal-skin temperature, wrist temperatures were measured. Methods: Wrist-skin temperatures were measured by an iButton® Temperature Logger. It was measured every 3 min for two and eight consecutive working days in the day and shift workers, respectively. Mesor, amplitude, and acrophase were measured by Cosinor analysis. Results: The shift-worker amplitude dropped significantly as the night shift progressed (0.92 to 0.85 °C), dropped further during rest (0.69 °C), and rose during the morning-shift days (0.82 °C). Day workers still had higher amplitudes (0.93 °C) than the morning-shift workers. The acrophase was delayed during the four night-shift days, then advanced during rest days and the morning-shift days. Nevertheless, the morning-shift worker acrophase was still significantly delayed compared to the day workers (08:03 a.m. vs. 04:11 a.m.). Conclusions: The further reduction of wrist-temperature amplitude during rest after the night shift may be due to the signal circadian rhythm disruption. Reduced amplitudes have been reported to be associated with intolerance to shift work. The findings of our study may help to design the most desirable schedule for shift workers. © 2017 by the authors. Licensee MDPI, Basel, Switzerland.
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