Key Takeaway
Flywheel resistance training produces significant improvements in muscle strength, power, and speed, with eccentric overload as the likely primary mechanism.
Summary
This meta-analysis by Petré et al. (2018) pooled data from studies examining the effects of flywheel-based resistance training on strength-related outcomes. Flywheel devices use inertial loading to provide resistance throughout the concentric phase, then deliver an eccentric overload as the spinning flywheel pulls back against the user. The analysis found significant positive effects on maximal strength, muscle power output, and sprint speed across the included studies. The authors identified eccentric overload — the hallmark of flywheel training — as the most plausible mechanism driving these adaptations. Because the flywheel stores kinetic energy during the concentric action and returns it during the eccentric phase, trainees are forced to absorb supramaximal eccentric loads, a stimulus that is difficult to replicate with conventional weight training. The findings support flywheel training as an effective modality for athletes seeking gains in strength and power, and suggest it may be particularly useful when eccentric-specific adaptations are the training goal.