title: High-Velocity Quadriceps Exercises Compared to Slow-Velocity Quadriceps Exercises Following Total Knee Arthroplasty: A Randomized Clinical Study.
abstract: OBJECTIVE
  Despite improvement in pain and perceived function in older adults following total knee arthroplasty (TKA), objective outcome measures of muscular impairment and ambulatory function demonstrate significant deficits. Evidence suggests that quadriceps power may play a greater role in ambulatory function than measures of strength alone following TKA. The purpose of this study was to compare the effect of high-velocity (HV) quadriceps exercises with that of slow-velocity (SV) quadriceps exercises on functional outcomes and quadriceps power following TKA.
  
  
  METHODS
  This study was a randomized clinical study conducted in an outpatient physical therapy clinic. Twenty-one participants who were 4 to 6 weeks post unilateral TKA were randomly assigned to an HV or SV group. Participants performed an evidence-based standardized progressive resistance exercise program in addition to HV quadriceps exercises or SV quadriceps exercises. Participants attended 2 sessions per week for 8 weeks. Before and after the 8-week exercise intervention, participants completed a functional questionnaire, health survey, functional testing, and underwent quadriceps strength and power testing.
  
  
  RESULTS
  Both groups demonstrated improvements in ambulatory outcome measures, strength, speed, and power. The HV group demonstrated significantly greater improvements in distance walked and quadriceps strength than the SV group.
  
  
  CONCLUSIONS
  These data should be considered preliminary because of a small sample size.
  
  
  CONCLUSIONS
  HV quadriceps exercises may be an effective rehabilitation strategy in conjunction with a standardized progressive resistance exercise program beginning 4 to 6 weeks after TKA.
authors.affiliation: 1Department of Orthopaedics and Rehabilitation, Division of Physical Therapy, University of New Mexico Health Sciences Center, Albuquerque. 2Rocky Mountain University of Health Professions, Provo, Utah. 3Department of Health, Exercise, & Sports Sciences, University of New Mexico, Albuquerque. 4School of Exercise & Nutritional Sciences, San Diego State University, San Diego, California. 5Outpatient Physical Therapy, Rehabilitation Services, University of New Hospital.
authors.forename: Deborah
authors.initials: D
authors.lastname: Doerfler
authors.forename: Burke
authors.initials: B
authors.lastname: Gurney
authors.forename: Christine
authors.initials: C
authors.lastname: Mermier
authors.forename: Mitchell
authors.initials: M
authors.lastname: Rauh
authors.forename: Liza
authors.initials: L
authors.lastname: Black
authors.forename: Ron
authors.initials: R
authors.lastname: Andrews
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000534:rehabilitation*; D004311:Double-Blind Method; D005081:Exercise Therapy / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D052097:Quadriceps Muscle / Q000502:physiology*