‍Purpose:  

To compare the effects of flywheel resistance training (FRT) and accentuated eccentric loading training (AELT) on the neuromuscular performance of college sprinters 

Methods: 

14 sprinters were randomly divided into the FRT (n = 7) or in the AELT (n = 7) groups.  Both groups completed 2 sessions per week for 8 weeks.  The AELT group performed 4 sets of 7 reps of the barbell back squats with weight releasers at an intensity of 80%:120% 1RM (concentric:eccentric).  The FRT group similarly performed 4 sets of 7 reps of flywheel squat with a delayed breaking strategy.  The inertial load was individualized to each subject’s strength levels using the corresponding velocity that was achieved during an 80% barbell squat assessment, which equated to approximately .58 m/s.  The following variables were assessed before and after the training intervention: CMJ, Squat jump, long jump, 30 m sprint, and eccentric utilization ratio (EUR = CMJ/Squat Jump) 

Results: 

The FRT group significantly improved all variables assessed.  The AELT group similarly improved all of the variables with the exception of EUR.  However, the FRT had significantly greater improvements in CMJ and EUR in comparison to the AELT group.  

Key Takeaways: 

• Both forms of eccentric training (FRT & AELT) can have a pronounce effect on power, strength and speed on college sprinters.  

• FRT could potentially induce greater adaptations in comparison to AELT, specifically in reference to jumping and an athlete’s ability to utilize their stretch shortening cycle. 

• Velocity thresholds or inertial velocity profiles can be utilized to individualize inertial load based upon an athlete’s strength levels.   In addition, it appears when inertial loads are equated to the corresponding 1RM intensity, similar overall increases in physical characteristics are achieved.