title: Age-related differences in muscular capacity among workers.
abstract: OBJECTIVE
  To quantify the age-related changes in muscular capacity in a working population, and to investigate whether these changes are dependent on sports participation.
  
  
  METHODS
  Data were used from the longitudinal study on musculoskeletal disorders, absenteeism, stress and health (n = 1,800). At baseline, isokinetic lifting strength and static muscle endurance were assessed, and endurance measurements were repeated after 3 years of follow-up. Sports participation was assessed using a questionnaire.
  
  
  RESULTS
  Cross-sectionally, static endurance of the neck/shoulder muscles was highest among older workers, but decreased longitudinally among all age groups. Younger workers who participated in sports 3 h per week or more had the best performance, but older workers who participated between 0 and 3 h per week had better performance than those who participated in sports more frequently.
  
  
  CONCLUSIONS
  There were age-related differences on muscular capacity. Younger workers who participated in sports frequently had the best muscular capacity. For aging workers, moderate sports participation seems to be effective in keeping them suitable for the relatively growing work demands.
authors.affiliation: Body@Work, Research Center Physical Activity, Work and Health, TNO-VU University Medical Center, Van der Boechorststraat 7, Amsterdam, The Netherlands.
authors.forename: Heleen H
authors.initials: HH
authors.lastname: Hamberg-van Reenen
authors.forename: Allard J
authors.initials: AJ
authors.lastname: van der Beek
authors.forename: Birgitte M
authors.initials: BM
authors.lastname: Blatter
authors.forename: Willem
authors.initials: W
authors.lastname: van Mechelen
authors.forename: Paulien M
authors.initials: PM
authors.lastname: Bongers
mesh_terms: D000328:Adult; D000375:Aging; D015331:Cohort Studies; D004651:Employment; D005260:Female; D006801:Humans; D017770:Lifting; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction; D053580:Muscle Strength; D009132:Muscles / Q000502:physiology*; D009426:Netherlands; D011446:Prospective Studies; D012737:Sex Factors; D013177:Sports; D011795:Surveys and Questionnaires; D055815:Young Adult