Peer-Reviewed Journal Details
Mandatory Fields
Harrison, AJ; Gaffney, SD
Journal Of Strength And Conditioning Research
Effects of muscle damage on stretch-shortening cycle function and muscle stiffness control
Optional Fields
stretch-shortening cycle delayed onset muscle soreness eccentric contraction jumping LEG STIFFNESS TENDON STRUCTURES DROP JUMP EXERCISE PERFORMANCE MECHANICS SURFACES SORENESS
Effects of muscle damage on stretch-shortening cycle function and muscle stiffness control. J. Strength Cond. Res. 18(4):771-776. 2004. - This experiment examined the effect of eccentric contraction-induced muscle damage on the stretch-shortening cycle and vertical leg spring stiffness during jumping activities. Ten moderately active male and female adult volunteers participated in this study (aged 23 +/- 2.3 years). Temporary muscle damage to the knee extensors was administered by a bout of eccentric contractions on an isokinetic dynamometer. Measurements were obtained of maximum voluntary force and of take-off velocities for single-leg countermovement jumps (CMJs), squat jumps (SJs), and drop jumps (DJs), performed on a specially constructed sledge and force plate apparatus. These measurements were obtained before and after the damage intervention, and the undamaged leg was used as a control. The results indicated that eccentric muscle damage significantly affected stretch-shortening cycle performance by causing relatively greater reductions in SJ performance than CMJ or DJ. The muscle damage intervention also significantly increased leg-spring stiffness, which indicates that the changes in leg stiffness may be an important adaptation resulting from eccentric exercise.
Grant Details