title: Associations between daily physical activity, handgrip strength, muscle mass, physical performance and quality of life in prefrail and frail community-dwelling older adults.
abstract: The aim of this study was to examine the associations between daily physical activity (DPA), handgrip strength, appendicular skeletal muscle mass (ASMM) and physical performance (balance, gait speed, chair stands) with quality of life in prefrail and frail community-dwelling older adults.
  
  
  
  Prefrail and frail individuals were included, as determined by SHARE-FI. Quality of life (QoL) was measured with WHOQOL-BREF and WHOQOL-OLD, DPA with PASE, handgrip strength with a dynamometer, ASMM with bioelectrical impedance analysis and physical performance with the SPPB test. Linear regression models adjusted for sex and age were developed: In model 1, the associations between each independent variable and QoL were assessed separately; in model 2, all the independent variables were included simultaneously.
  
  
  
  Eighty-three participants with a mean age of 83 (SD: 8) years were analysed. Model 1: DPA (ß = 0.315), handgrip strength (ß = 0.292) and balance (ß = 0.178) were significantly associated with 'overall QoL'. Balance was related to the QoL domains of 'physical health' (ß = 0.371), 'psychological health' (ß = 0.236), 'environment' (ß = 0.253), 'autonomy' (ß = 0.276) and 'social participation' (ß = 0.518). Gait speed (ß = 0.381) and chair stands (ß = 0.282) were associated with 'social participation' only. ASMM was not related to QoL. Model 2: independent variables explained 'overall QoL' (R2= 0.309), 'physical health' (R2= 0.200), 'autonomy' (R2= 0.247) and 'social participation' (R2= 0.356), among which balance was the strongest indicator.
  
  
  
  ASMM did not play a role in the QoL context of the prefrail and frail older adults, whereas balance and DPA were relevant. These parameters were particularly associated with 'social participation' and 'autonomy'.
authors.affiliation: Centre for Public Health, Institute of Social Medicine, Medical University of Vienna, Kinderspitalgasse 15/1, 1090, Vienna, Austria. sandra.a.haider@meduniwien.ac.at.
authors.forename: Sandra
authors.initials: S
authors.lastname: Haider
authors.affiliation: Centre for Public Health, Institute of Social Medicine, Medical University of Vienna, Kinderspitalgasse 15/1, 1090, Vienna, Austria.
authors.forename: Eva
authors.initials: E
authors.lastname: Luger
authors.affiliation: Centre for Public Health, Institute of Social Medicine, Medical University of Vienna, Kinderspitalgasse 15/1, 1090, Vienna, Austria.
authors.forename: Ali
authors.initials: A
authors.lastname: Kapan
authors.affiliation: Institute of Sport Science, University of Graz, Mozartgasse 14/I, 8010, Graz, Austria.
authors.forename: Sylvia
authors.initials: S
authors.lastname: Titze
authors.affiliation: Department for Health Promotion and Prevention, SPORTUNION Austria, Falkestraße 1, 1010, Vienna, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Lackinger
authors.affiliation: Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.
authors.forename: Karin E
authors.initials: KE
authors.lastname: Schindler
authors.affiliation: Centre for Public Health, Institute of Social Medicine, Medical University of Vienna, Kinderspitalgasse 15/1, 1090, Vienna, Austria.
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Dorner
mesh_terms: D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D015444:Exercise / Q000523:psychology*; D005260:Female; D016330:Frail Elderly; D015577:Geriatric Assessment; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D012111:Residence Characteristics; D018434:Sickness Impact Profile
keywords: Balance; Frailty; Handgrip strength; Muscle mass; Quality of life