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Phys Ther Sport. 2010 May;11(2):50-5. doi: 10.1016/j.ptsp.2009.12.002. Epub 2010 Jan 22.

Effects of eccentric exercise on optimum length of the knee flexors and extensors during the preseason in professional soccer players.

Author information

1
School of Exercise, Biomedical and Health Sciences, Edith Cowan University, 100 Joondalup Drive, Joondalup, Western Australia 6027, Australia. mattbrughelli@hotmail.com <mattbrughelli@hotmail.com>

Abstract

OBJECTIVE:

To assess the effects of eccentric exercise on optimum lengths of the knee flexors and extensors during the preseason in professional soccer.

DESIGN:

Twenty-eight athletes from a professional Spanish soccer team (Division II) were randomly assigned to an eccentric exercise intervention group (EG) or a control group (CG). Over the four-week period two athletes from the control group suffered RF injuries and two athletes were contracted by other clubs. After these exclusions, both groups (EG, n=13; and CG, n=11) performed regular soccer training during the four-week preseason period.

RESULTS:

After the four weeks, the optimum lengths of the knee flexors were significantly (P<0.05) increased by 2.3 degrees in the CG and by 4.0 degrees in the EG. The change in the EG was significantly (P<0.05) greater than that of the CG. The optimum lengths of the knee extensors were significantly increased only in the EG by 6.5 degrees . Peak torque levels and ratios of quadriceps to hamstring (Q/H ratios) were not significantly altered throughout the study for either group.

CONCLUSION:

Eccentric exercise can increase the optimum lengths of both the knee extensors and knee extensors flexors during the preseason in professional soccer.

PMID:
20381001
DOI:
10.1016/j.ptsp.2009.12.002
[Indexed for MEDLINE]

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