Post-activation Performance Enhancement of Flywheel Training VS. Accentuated Eccentric Loading Training on Lower Limb Explosive Power Performance

The primary objective of this study was to investigate the intervention effects of flywheel training and accentuated eccentric loading training on the post-activation performance enhancement effects in sprinters. Twenty sprint-trained athletes were assessed across 4 days. Countermovement jump height, squat jump peak power, and 30-meter sprint times were measured at 4, 8, 12, and 16 minutes post-intervention for two training methods, noting transient changes. The results showed that the flywheel training intervention significantly enhanced the three indexes, and the peak value appeared at the 4th minute. The enhancement effect gradually weakened with time and was absent at the 16th minute. Accentuated eccentric loading significantly improved countermovement jump height and squat jump peak power, with effects peaking around 12 minutes post-intervention. However, it did not enhance 30-meter sprint time; sprint times notably increased at 4, 8, and 12 minutes. The results of this study suggest that flywheel training yields a quicker, more pronounced post-activation performance enhancement at equivalent loads compared to accentuated eccentric loading, though this effect diminishes rapidly. Centrifugal hook-induced enhancement endures longer but is initially masked by fatigue, with noticeable effects primarily at 12 or 16 minutes.