Campus Units

Kinesiology

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

12-2012

Journal or Book Title

Journal of Applied Biomechanics

Volume

28

Issue

6

First Page

708

Last Page

717

DOI

10.1123/jab.28.6.708

Abstract

The effects of training on biomechanical risk factors for anterior cruciate ligament (ACL) injuries have been investigated, but the effects of detraining have received little attention. The purpose of this study was to evaluate the effects of a one-month postseason break on knee biomechanics and lower extremity electromyography (EMG) during a stop-jump task. A postseason break is the phase between two seasons when no regular training routines are performed. Twelve NCAA female volleyball players participated in two stop-jump tests before and after the postseason break. Knee kinematics, kinetics, quadriceps EMG, and hamstring EMG were assessed. After one month of postseason break, the players demonstrated significantly decreased jump height, decreased initial knee flexion angle, decreased knee flexion angle at peak anterior tibial resultant force, decreased prelanding vastus lateralis EMG, and decreased prelanding biceps femoris EMG as compared with prebreak. No significant differences were observed for frontal plane biomechanics and quadriceps and hamstring landing EMG between prebreak and postbreak. Although it is still unknown whether internal ACL loading changes after a postseason break, the more extended knee movement pattern may present an increased risk factor for ACL injuries.

Comments

This accepted manuscript is an article published as Dai B, Sorensen C, Derrick TR & Gillette JC. (2012). The effects of postseason break on knee biomechanics and lower extremity EMG in a stop-jump task: implications for ACL injury. Journal of Applied Biomechanics, 28(6): 708-717.Doi: 10.1123/jab.28.6.708. Posted with permission.

Copyright Owner

Human Kinetics

Language

en

File Format

application/pdf

Published Version

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