Document Detail

Strength deficits identified with concentric action of the hip extensors and eccentric action of the hamstrings predispose to hamstring injury in elite sprinters.
MedLine Citation:
PMID:  18678956     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: Prospective cohort study. OBJECTIVES: In this prospective cohort study of elite sprinters, muscle strength of the hip extensors, as well as of the knee extensors and flexors, was measured to determine a possible relationship between strength deficits and subsequent hamstring injury within 12 months of testing. The method used for testing muscle strength simulated the specific muscle action during late swing and early contact phases when sprinting. BACKGROUND: There have been no prospective studies in elite sprinters that examine the concentric and eccentric isokinetic strength of the hip extensors and the quadriceps and hamstring muscles in a manner that reflects their actions in late swing or early contact phases of sprinting. Consequently, the causal relationship between hip and thigh muscle strength and hamstring injury in elite sprinters may not be fully understood. METHODS AND MEASURES: Isokinetic testing was performed on 30 male elite sprinters to assess hip extensors, quadriceps, and hamstring muscle strength. The occurrence of hamstring injury among the subjects was determined during the year following the muscle strength measurements. The strength of the hip extensors, quadriceps, and hamstring muscles, as well as the hamstrings-quadriceps and hip extensors- quadriceps ratios were compared. RESULTS: Hamstring injury occurred in 6 subjects during the 1-year period. Isokinetic testing at a speed of 60 degrees /s revealed weakness of the injured limb with eccentric action of the hamstring muscles and during concentric action of the hip extensors. When performing a side-to-side comparison for the injured sprinters, the hamstring injury always occurred on the weaker side. Differences in the hamstrings-quadriceps and hip extensors-quadriceps strength ratios were also evident between uninjured and injured limbs, and this was attributable to deficits in hamstring strength. CONCLUSION: Hamstring injury in elite sprinters was associated with weakness during eccentric action of the hamstrings and weakness during concentric action of the hip extensors, but only when tested at the slower speed of 60 degrees /s.
Yusaku Sugiura; Tomoyuki Saito; Keishoku Sakuraba; Kazuhiko Sakuma; Eiichi Suzuki
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Publication Detail:
Type:  Journal Article     Date:  2008-08-01
Journal Detail:
Title:  The Journal of orthopaedic and sports physical therapy     Volume:  38     ISSN:  0190-6011     ISO Abbreviation:  J Orthop Sports Phys Ther     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-05     Completed Date:  2008-12-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7908150     Medline TA:  J Orthop Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  457-64     Citation Subset:  IM    
Yokohama City University, Graduate School of Medicine, Musculoskeletal Science, Kanagawa, Japan.
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MeSH Terms
Hip Joint / physiopathology*
Muscle Strength*
Muscle, Skeletal / injuries*
Prospective Studies
Running / injuries,  physiology*
Thigh / physiopathology
Young Adult

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

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