Citation

Cochrane JL, Lloyd DG, Besier TF, Elliott BC, Doyle TLA, Ackland TR. Med. Sci. Sports Exerc. 2010; 42(8): 1535-1544.

Affiliation

School of Sport Science, Exercise and Health, University of Western Australia. Department of Orthopaedics, Stanford University Department of Orthopaedics, Stanford University.

Copyright

(Copyright © 2010, Lippincott Williams and Wilkins)

DOI

10.1249/MSS.0b013e3181d03ba0

PMID

20068492

Abstract

PURPOSE:: The current study examined how different training affects the kinematics and applied moments at the knee during sporting maneuvers and the potential to reduce loading of the anterior cruciate ligament (ACL). The training programs were: 1) Machine-Weights; 2) Free-Weights; 3) Balance-Training; and 4) Machine-Weights + Balance-Training. METHODS:: Fifty healthy male subjects were allocated to either a control group or one of four 12-week training programs. Subjects were tested pre- and post-training, performing running and cutting maneuvers from which knee angle and applied knee moments were assessed. Data analyzed were peak applied flexion/extension, varus/valgus and internal/external rotation moments, as well as knee flexion angles during specific phases of stance during the maneuvers. RESULTS:: The Balance-Training group decreased their peak valgus and peak internal rotation moments during weight-acceptance in all maneuvers. This group also lowered their flexion moments during the sidestep to 60 degrees . Free-Weights training induced increases in the internal rotation moment, and decreases in knee flexion angle in the peak push-off phase of stance. Machine-Weights training elicited increases in the flexion moment and reduced peak valgus moments in weight-acceptance. Machine+Balance resulted in no changes to variables assessed. CONCLUSION:: Balance-Training produced reductions in peak valgus and internal rotation moments which could lower ACL injury risk during sporting maneuvers. Strength training tended to increase the applied knee loading known to place strain on the ACL, with the Free-Weights group also decreasing the amount of knee flexion. It is recommended that Balance-Training be implemented as it may reduce the risk of ACL injury.

Language: en