期刊
INTERNATIONAL JOURNAL OF SPORTS MEDICINE
卷 37, 期 7, 页码 559-564出版社
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0042-100290
关键词
eccentric overload; football; gracilis; functional magnetic resonance imaging; iso-inertial exercise
资金
- NPRP grant from the Qatar National Research Fund (a member of Qatar Foundation) [6-1526-3-363]
his study used functional magnetic resonance imaging (fMRI) to compare individual muscle use in exercises aimed at preventing hamstring injuries. Thirty-six professional soccer players were randomized into 4 groups, each performing either Nordic hamstring, flywheel leg curl, Russian belt or conic-pulley exercise. MRIs were performed before and immediately after a bout of 4 sets of 8 repetitions. Pre-post exercise differences in contrast shift (T-2) were analyzed for the long (BFLh) and short head (BFSh) of biceps femoris, semitendinosus (ST), semimembranosus (SM) and gracilis (GR) muscles. Flywheel leg curl increased (P <0.001) T-2 of GR (95 %), ST (65 %), BFSh (51 %) and BFLh (14 %). After the Nordic hamstring, GR (39%), ST (16 %) and BFSh (14 %) showed increased T-2 (P < 0.001). Russian belt and conic-pulley exercise produced subtle (P < 0.02) T-2 increases of ST (9 and 6 %, respectively) and BFLh (7 and 6 %, respectively). Russian belt increased T-2 of SM (7 %). Among exercises examined, flywheel leg curl showed the most substantial hamstring and GR muscle use. However, no single exercise executed was able to increase T-2 of all hamstring and synergist muscles analyzed. It is therefore suggested that multiple exercises must be carried out to bring in, and fully activate all knee flexors and hip extensors.
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