title: Musculoskeletal pain and night-shift naps in nursing home care workers.
abstract: BACKGROUND
  Care workers in nursing homes are at high risk of developing musculoskeletal disorders (MSDs). Many care workers work in shifts, which may compromise both the quality of care they give and their working life. Taking a nap during night shifts has been proposed to ameliorate shift work-related problems, but its relationship with MSDs is not clear.
  
  
  OBJECTIVE
  To explore how MSD pain differs according to frequency of night-shift naps.
  
  
  METHODS
  A questionnaire study was conducted on 111 care workers at three nursing homes. Of 98 respondents, data from 66 shift workers (54 women) were analysed. Data on self-rated pain in multiple sites (neck, shoulder, arm, leg and low back), naps during night shifts and relevant variables were collected. Participants were categorized into three groups on the basis of frequency of night-shift naps taken during the previous month: non-nappers, <50% nappers and >or =50% nappers.
  
  
  RESULTS
  Pain at all sites, with the exception of low back pain, differed significantly among the three groups. Pain scores were lowest at the arm and leg for the > or =50% nappers. Neck and shoulder pain was lower for the > or =50% nappers and the non-nappers compared to the <50% nappers.
  
  
  CONCLUSIONS
  Reduced pain in the arm and leg was associated with taking a nap at least once every two night shifts among the nursing home care workers. No association was found between low back pain and night-shift naps in this sample.
authors.affiliation: National Institute of Occupational Safety and Health, Nagao, Tama-ku, Kawasaki, Japan. takaham@h.jniosh.go.jp
authors.forename: Masaya
authors.initials: M
authors.lastname: Takahashi
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Iwakiri
authors.forename: Midori
authors.initials: M
authors.lastname: Sotoyama
authors.forename: Mamoru
authors.initials: M
authors.lastname: Hirata
authors.forename: Naomi
authors.initials: N
authors.lastname: Hisanaga
mesh_terms: D000328:Adult; D000488:Allied Health Personnel; D005260:Female; D006707:Homes for the Aged; D006801:Humans; D008297:Male; D009140:Musculoskeletal Diseases / Q000517:prevention & control*; D009735:Nursing Homes; D009784:Occupational Diseases / Q000517:prevention & control*; D010146:Pain / Q000517:prevention & control*; D012890:Sleep / Q000502:physiology*; D014940:Work Schedule Tolerance / Q000502:physiology*; D055815:Young Adult