OBJECTIVES: To determine whether restorative yoga is an effective method for relieving occupational stress among female nurses working the night shift in Japan. METHODS: From July 2017 to May 2018, 20 female nurses aged in their 20s to 30s who were working the night shift at a university hospital participated in a randomized crossover trial, consisting of a 1-hour guided group yoga session followed by 4 weeks of at-home practice and 4 weeks of usual stress relief methods. The level of stress was assessed by the Brief Job Stress Questionnaire of the Ministry of Health, Labour and Welfare before and after performing restorative yoga. Descriptive statistics were calculated and data were analyzed by Student's t test, one-way analysis of variance (with repeated measures), or Bonferroni's multiple comparison test. RESULTS: Vital signs showed no significant differences from before to after the group yoga session, and there was no change of weight after 4 weeks of at-home practice. The mean questionnaire score for "psychological and physical stress reactions" was significantly reduced after the group yoga session. In addition, the mean score was significantly lower after 4 weeks of at-home practice than before or after group yoga, or after 4 weeks of the usual stress relief methods. CONCLUSIONS: These findings suggest that restorative yoga may be effective for alleviating occupational stress among female nurses working the night shift.

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