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RESEARCH PRODUCT
EMG amplitude of the biceps femoris during jumping compared to landing movements.
Antonino BiancoAlessandra TilocaJohnny PaduloDouglas W. PowellAntonio PaoliG Granatellisubject
Squat jumpmedicine.medical_specialtyMultidisciplinarymedicine.diagnostic_testbusiness.industryElectromyographyResearchRepeated measures designHamstring injuriesElectromyographyConcentricmedicine.disease_causeCounter movement jumpBicepsStretch shortening cycleJumpingPhysical medicine and rehabilitationSquat jumpmedicinePhysical therapyEccentricStretch-shortening cyclebusinessBraking phasedescription
Abstract Hamstrings injury is a common occurrence in athletic performance. These injuries tend to occur during a deceleration or landing task suggesting the negative work may be a key component in hamstrings injury. The purpose of this study was to investigate the muscular activity (EMG) of the biceps femoris (BF) in different phases (concentric vs. eccentric) of a Counter Movement Jump (CMJ), Squat Jump (SJ) and the Braking Phase (BP) of a landing task. Twelve female volleyball players performed 5 CMJs, SJs and BPs while surface EMG was recorded using a MuscleLab (BoscoSystemTM, Norway). EMG values were normalized to an maximal voluntary contraction. A repeated measures analysis of variance (ANOVA) was used to compare mean normalized EMG values of the concentric and eccentric portions of the CMJ with the BP and SJ. The ANOVA revealed significantly lower BF activation in the concentric and eccentric portions of the CMJ compared to the BP (64%, p < 0.001) and SJ (7%, p = 0.02), respectively. These findings suggest that the CMJ relies on a greater contribution of elastic tissues during the concentric and eccentric portions of the movement and thus requires less muscle activation of the BF.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-01-01 | SpringerPlus |