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Effects of stretch shortening cycle exercise fatigue on stress fracture injury risk during landing.

Authors
  • James, C Roger
  • Dufek, Janet S
  • Bates, Barry T
Type
Published Article
Journal
Research quarterly for exercise and sport
Publication Date
Mar 01, 2006
Volume
77
Issue
1
Pages
1–13
Identifiers
PMID: 16646347
Source
Medline
License
Unknown

Abstract

The purpose of this study was to examine changes in landing performance during fatigue that could result in increased stress fracture injury risk. Five participants performed nonfatigued and fatigued drop landings (0.60 m), while ground reaction force (GRF), electromyographic (EMG) activity, and kinematics were recorded. Fatigue was defined as a 5-20% reduction in vertical jumping performance. Single-subject analyses revealed that all participants were affected (p < or = .05) by fatigue. Post hoc comparisons revealed a group effect (p < or = .05) for selected variables. Participants landed with (a) less joint flexion at contact and used a greater range of motion, (b) greater GRF peaks and loading rates, and (c) less EMG activity. These changes were consistent with greater risk of stress fracture.

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