The purpose of this study was to assess the effects of muscle-damaging exercise on the time to peak power during maximal intensity cycling and drop jump performance. Nineteen subjects were randomly assigned to a treatment (n = 10, age 22.6 +/- 2.8 years, body mass 70.7 +/- 12.9 kg, stature 1.76 +/- 0.10 m) or control group (n = 9, age 20.8 +/- 2.5 years, body mass 74.2 +/- 10.2 kg, stature 1.76 +/- 0.07 m) and randomly performed a 10-second cycle ergometer sprint, against a load corresponding to 0.70Nm/kg for males and 0.67Nm/kg for females, and a drop jump from a height of 50 cm. Indirect markers of muscle damage (perceived muscle soreness and isokinetic knee extensor torque at 60 and 360 deg/s) were also assessed. All measures were taken before and at 24, 48, 72 and 168 hours following a plyometric exercise protocol comprised of 10x10 maximal countermovement jumps. Repeated measures ANOVA showed significant interactions of time by group on all dependent measures (p < 0.05). Peak power output, time to peak power output, drop jump height, ground contact time during the drop jump, and strength at both joint angular velocities were all adversely affected in the treatment group, with no significant changes in the control group. These results provide further evidence that dynamic muscle performance is compromised in the days following muscledamaging exercise.

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