title: Grip and knee extension muscle strength reflect a common construct among adults.
abstract: BACKGROUND
  Both grip and knee extension strength are often used to characterize overall limb muscle strength. We sought to determine if the measures actually reflect a common construct.
  
  
  METHODS
  The isometric grip and knee extension strength of 164 healthy men and women (range, 18-85 years) were measured bilaterally using standard procedures. Pearson correlations (r), Cronbach alpha, principal components analysis, and multiple regression/correlation were used to investigate the dimensionality of the measures.
  
  
  RESULTS
  Left and right grip forces and knee extension torques were highly correlated, internally consistent, and loaded on a single component. Gender and age explained the variance in both measures, but height added to the explanation of grip strength, whereas weight added to the explanation of knee extension strength.
  
  
  CONCLUSIONS
  Among healthy adults, grip and knee extension strength reflect a common underlying construct. The measures, however, are affected differently by height and weight.
authors.affiliation: Program in Physical Therapy, Department of Kinesiology, U-2101, University of Connecticut, Storrs, Connecticut 06269-2101 USA. richard.bohannon@uconn.edu
authors.forename: Richard W
authors.initials: RW
authors.lastname: Bohannon
authors.forename: Susan R
authors.initials: SR
authors.lastname: Magasi
authors.forename: Deborah J
authors.initials: DJ
authors.lastname: Bubela
authors.forename: Ying-Chih
authors.initials: YC
authors.lastname: Wang
authors.forename: Richard C
authors.initials: RC
authors.lastname: Gershon
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D053581:Muscle Strength Dynamometer / Q000592:standards*; D055815:Young Adult