The following EMG plots group and superimpose the platform jumps and no-platform jumps together so that readers can identify any major differences between the two types of jumps easily. From a generally point of view, the no-platform jumps seem to cause more muscle activities after the nominal impact for subject AQK. Muscle onsets and bursts are obviously occurring more frequently especially for quadriceps, tibilias anterior, gastrocnemius, and paraspinal after the nominal platform impact.