title: The relationships between muscle strength, biomechanical functional moments and health-related quality of life in non-elite older adults.
abstract: OBJECTIVE
  to investigate the association between muscle strength, biomechanical functional moments during everyday tasks and health-related quality of life (HRQoL) in older adults.
  
  
  METHODS
  eighty-four healthy adults aged 60-88 years were tested. A torque dynamometer was utilised to measure muscle moments at the knee and hip joints. Functional assessment involved three-dimensional biomechanical analysis of gait, chair rise and sit-down, stair ascent and descent using an 8-camera VICON® system with Kistler force plates. HRQoL was assessed using the Short Form-36 (SF-36) questionnaire.
  
  
  RESULTS
  Spearman's correlation coefficient showed significant correlation (P < 0.001) between isometric strength and functional moments (r = 0.24-0.67). Muscle strength was significantly correlated with SF-36 scores, including physical functioning, bodily pain, vitality, social functioning and role emotional scores. Knee flexion moment was correlated with role physical, vitality, social functioning, role emotional, mental health and mental component scores (r = 0.24-0.40).
  
  
  CONCLUSIONS
  loss of muscle strength is associated with poorer functional ability and both are associated with reduced HRQoL. The reduction in HRQoL is considerable in the physical functioning domain. Cause and effect was not established but studies need to be undertaken to evaluate the benefits of strength training, functional activity training or increased participation in life.
authors: Faculty of Health Sciences, University of Southampton, Building 45, Burgess Road, Highfield, Southampton SO17 1BJ, UK. d.samuel@soton.ac.uk
authors: Dinesh
authors: D
authors: Samuel
authors: Philip
authors: P
authors: Rowe
authors: Victoria
authors: V
authors: Hood
authors: Alexander
authors: A
authors: Nicol
mesh_terms: D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000523:psychology; D001696:Biomechanical Phenomena; D005260:Female; D006304:Health Status; D006621:Hip Joint / Q000503:physiopathology; D006801:Humans; D007537:Isometric Contraction; D007719:Knee Joint / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D053581:Muscle Strength Dynamometer; D018482:Muscle, Skeletal / Q000503:physiopathology*; D009135:Muscular Diseases / Q000503:physiopathology* / Q000523:psychology; D011788:Quality of Life; D012606:Scotland; D011795:Surveys and Questionnaires; D019415:Torque; D014741:Video Recording