Abstract
The purpose of this study was to investigate the effects of physical properties of surfaces on lower extremity joint motion and muscle activities during rhythmical hopping. Eight healthy male subjects volunteered to perform hopping at fixed rhythm on four surface conditions (no surface (control) sample A (degree of rebound: 50%) sample B (41%) sample C (13%)). The surface electromyography (EMG) of tibial anterior, gastrocnemius medialis, rectus femoris and biceps femoris were measured. A 3-D image for the motion analysis and ground reaction force were recorded by two high-speed cameras and two forceplatforms, simultaneously. Then power, work and stiffness of ankle, knee, hip joints and leg stiffness were calculated. At comparison of surface conditions there is no significant difference on each measured value in this study. The results of this study suggest that there are no influence on lower extremity joint motion and muscle activities as opposed to physical properties of surfaces under these experimental conditions.
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