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Non-uniform changes in MRI measurements of the thigh muscles following two hamstring strengthening exercises.
MedLine Citation:
PMID:  22592171     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT:: Though many different hamstring strengthening exercises exist, the effect on site specific activation of these exercises on different muscles of the leg is unclear. This study investigated the effects of the eccentric leg curl (LC) and lunge (L) exercises on the biceps femoris long head (BFl), biceps femoris short head (BFs), semitendinosus (ST), semimembranosus (SM) and adductor magnus (AM). Each leg of 11 male professional soccer players was randomly assigned to an LC or L exercise protocol (3 sets of 6 repetitions). Functional magnetic resonance imaging (fMRI) of the subjects' thighs were performed before and 48 hours after the intervention. Fifteen axial scans of the thigh interspaced by a distance of 1 / 15 right femur length (Lf) were obtained. The fMRI data were analyzed for signal intensity (SI) changes. No significant changes were observed in absolute short tau inversion recovery (STIR) values for the SM and BFs. Significant changes for the ST (∼21-45%) from sections 4 to 10, AM (∼2-13%) at section 4, and BFl (∼ -3 vs 8%) at section 7 were noted. LC exercises load all regions of the ST muscle. L exercises load the proximal regions of the BFl and AM. These findings may have relevance when designing protocols for prevention and rehabilitation of hamstring injuries.
Authors:
J Mendiguchia; M A Garrues; J B Cronin; B Contreras; A Los Arcos; N Malliaropoulos; N Maffulli; F Idoate
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-15
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Zentrum rehab and performance Center.Department of Physical Therapy.Pamplona, Spain. 2Public University of Navarre, Health Science Department .Graduate School for Health Sciences, Physical Therapy School, Tudela, Spain. 3Sport Performance Research Institute New Zealand, AUT University, Auckland, New Zealand 4School of Biomedical and Health Sciences, Edith Cowan University, Joondalup, Australia. 5Club Atletico Osasuna.Pamplona. Spain. 6National Track & Field Centre, Sports Medicine Clinic of S.E.G.A.S., Thessaloniki, Greece 7The London School of Medicine and Dentistry Institute of Health Sciences Education Centre for Sports and Exercise Medicine Mile End Hospital. 8Radiology Department, Clinica San Miguel, Pamplona, Spain.
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