title: Age-related changes in maximal hip strength and movement speed.
abstract: BACKGROUND
  We quantified age-related decreases in the ability of female participants to generate whole leg movements about the hip.
  
  
  METHODS
  We measured maximum hip strength and hip velocity in 12 young and 12 older healthy women. Both capabilities could help fall prevention by contributing to fast leg movements. We also measured maximum velocities as a function of isotonic load.
  
  
  RESULTS
  Young participants produced 107.6 +/- 25.4 N-m (mean +/- SD) isometric torque in flexion and 109.3 +/- 22.3 N-m in extension. Older participants produced 22% and 31% lower torques, respectively (p<.001). Young participants generated maximum velocities of 362.8 +/- 51.5 degrees/s in flexion and 371.5 +/- 54.2 degrees/s in extension. Older participants produced 16% lower velocities in both directions (p<.001). Older participants also produced lower velocities as a function of load (p<.001), and lower maximum power (p<.001).
  
  
  CONCLUSIONS
  Both maximum strength and velocity contribute to reduced ability to move the leg quickly with age.
authors.affiliation: Department of Biomedical Engineering, The University of Michigan, Ann Arbor 48109-2125, USA. jcdean@umich.edu
authors.forename: Jesse C
authors.initials: JC
authors.lastname: Dean
authors.forename: Arthur D
authors.initials: AD
authors.lastname: Kuo
authors.forename: Neil B
authors.initials: NB
authors.lastname: Alexander
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D005260:Female; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D013997:Time Factors; D016474:Weight-Bearing