Document Detail

Effects of early progressive eccentric exercise on muscle size and function after anterior cruciate ligament reconstruction: a 1-year follow-up study of a randomized clinical trial.
MedLine Citation:
PMID:  18988664     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND PURPOSE: The authors previously reported that focused eccentric resistance training during the first 15 weeks following anterior cruciate ligament reconstruction (ACL-R) induced greater short-term increases in muscle volume, strength, and measures of function relative to standard rehabilitation. The purpose of this study was to evaluate the effects of early progressive eccentric exercise on muscle volume and function at 1 year after ACL-R. PARTICIPANTS AND METHODS: Forty patients who had undergone an ACL-R were randomly assigned to 1 of 2 groups: a group that received early progressive eccentric exercise (n=20) and a group that received standard rehabilitation (n=20). Seventeen participants in the eccentric exercise group and 15 participants in the standard rehabilitation group completed a 1-year follow-up. Magnetic resonance images of the thighs were acquired 1 year after ACL-R and compared with images acquired 3 weeks after surgery. Likewise, routine knee examinations, self-report assessments, and strength and functional testing were completed 1 year after surgery and compared with previous evaluations. A 2-factor analysis of variance for repeated measures (group x time) was used to analyze the data. RESULTS: Compared with the standard rehabilitation group, improvements in quadriceps femoris and gluteus maximus muscle volume in the involved lower extremity from 3 weeks to 1 year following ACL-R were significantly greater in the eccentric exercise group. Improvements in quadriceps femoris and gluteus maximus muscle volume were 23.3% (SD=14.1%) and 20.6% (SD=12.9%), respectively, in the eccentric exercise group and 13.4% (SD=10.3%) and 11.6% (SD=10.4%), respectively, in the standard rehabilitation group. Improvements in quadriceps femoris muscle strength and hopping distance also were significantly greater in the eccentric exercise group 1 year postsurgery. DISCUSSION AND CONCLUSION: A 12-week focused eccentric resistance training program, implemented 3 weeks after ACL-R, resulted in greater increases in quadriceps femoris and gluteus maximus muscle volume and function compared with standard rehabilitation at 1 year following ACL-R.
J Parry Gerber; Robin L Marcus; Leland E Dibble; Patrick E Greis; Robert T Burks; Paul C LaStayo
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2008-11-06
Journal Detail:
Title:  Physical therapy     Volume:  89     ISSN:  1538-6724     ISO Abbreviation:  Phys Ther     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-02     Completed Date:  2009-01-26     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0022623     Medline TA:  Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  51-9     Citation Subset:  AIM; IM    
US Military-Baylor University Postgraduate Sports Medicine Residency Program, US Military Academy, Keller Army Community Hospital, West Point, NY 10996, USA.
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MeSH Terms
Anterior Cruciate Ligament / injuries,  physiopathology,  surgery*
Early Ambulation
Follow-Up Studies
Knee Injuries / pathology,  physiopathology,  therapy*
Muscle Strength / physiology*
Organ Size
Quadriceps Muscle / pathology*,  physiopathology*
Recovery of Function / physiology
Resistance Training / methods*
Time Factors
Treatment Outcome
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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