This crossover experiment shows that both isoinertial flywheel and traditional resistance methods improve countermovement jump performance, indicating potential for athletic training.
The aim of this study was to investigate the acute and delayed effects of two postactivation performance enhancement (PAPE) protocols on countermovement jump (CMJ) height without arm work. 16 strength-trained male participants from various team sports performed, in a single-group, non-synchronous crossover experiment, two different PAPE protocols: traditional resistance using free weights (TR) and resistance generated using an isoinertial flywheel device (FW). Familiarization sessions were conducted prior to the protocols. The TR protocol resistance was set at power maximum (Pmax) determined through diagnostic series of progressive loading. The FW protocol used an encoder to set resistances, and the resistance with the highest Pmax in concetric phase was selected. Each protocol consisted of 3 sets of 6 repetitions with a 2-minute rest interval. CMJ height was measured at baseline, 6 minutes, and 24 hours after the both PAPE protocols. The CMJ height significantly increased at 6 minutes after FW protocol (p < 0.01) and after TR protocol (p < 0.05) but did not significantly increase after 24 hours after both protocols (p < 0.05). In conclusion the FW and TR protocol showed significant increases after 6 minutes but not after 24 hours in CMJ height. This suggests that FW and TR protocol can be a effective method for acutely inducing CMJ height improvements but not after 24 hours.
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Smoliga et al. (2025) studied this question.
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