title: Modification Effects of Changes in Job Demands on Associations Between Changes in Testosterone Levels and Andropause Symptoms: 2-Year Follow-up Study in Male Middle-Aged Japanese Workers.
abstract: The purpose of this longitudinal study was to ascertain if changes in job demands modify associations between changes in testosterone levels and andropause symptoms in male Japanese workers.
  
  
  
  A baseline survey including job demands and the Aging Males' Symptoms scale, lifestyle factors, and blood levels of testosterone was conducted in 2007. Among 192 men (mean age ± SD 52.2 ± 7.6 years) who completed all relevant questionnaires and provided blood at baseline, 104 men (50.9 ± 7.2 years) were followed up in 2009. Changes of variables in 2 years were calculated (data of follow-up minus those of baseline).
  
  
  
  Testosterone levels were increased significantly, whereas job demands and somatic symptoms were reduced significantly, at follow-up. Changes in testosterone levels were negatively associated with changes in total andropause symptoms, psychological symptoms, and sexual symptoms (standardized β = -0.27, -0.24, and, -0.29, p < 0.05, respectively), after adjustment for confounders. Changes in job demands were positively associated with changes in somatic symptoms (standardized β = 0.21, p < 0.05). Significant interactions of changes in testosterone levels and job demands were noted for changes in psychological symptoms (standardized β = 0.26, p < 0.05). For men with a 1-SD reduction in job demands, negative associations between changes in testosterone levels and psychological symptoms were intensified, but not for men with a 1-SD increase in job demands.
  
  
  
  Andropause symptoms may be affected by changes in testosterone levels and job demands. Change in job demands may modify associations between changes in testosterone levels and andropause symptoms.
authors.affiliation: Department of Nursing, Baika Women's University, 2-19-5 Shukunosho, Ibaraki, Osaka, 567-8578, Japan. k-umi@umin.ac.jp.
authors.forename: Kumi
authors.initials: K
authors.lastname: Hirokawa
authors.affiliation: Department of Welfare System and Health Science, Okayama Prefectural University, 111 Kuboki, Soja City, Okayama, 719-1197, Japan.
authors.forename: Toshiyo
authors.initials: T
authors.lastname: Taniguchi
authors.affiliation: Department of Welfare System and Health Science, Okayama Prefectural University, 111 Kuboki, Soja City, Okayama, 719-1197, Japan.
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Fujii
authors.affiliation: Department of Public Health, Sanyo Gakuen University Graduate School of Nursing, 1-14-1 Hirai, Naka-ku, Okayama, 703-8501, Japan.
authors.forename: Jiro
authors.initials: J
authors.lastname: Takaki
authors.affiliation: Department of Public Health, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, 252-0374, Japan.
authors.forename: Akizumi
authors.initials: A
authors.lastname: Tsutsumi
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D047649:Andropause / Q000502:physiology*; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone
keywords: Andropause symptoms; Japanese workers; Job stress; Longitudinal study; Testosterone