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The present study analyzed the acute effects of an incremental running test on countermovement jump (CMJ) and handgrip strength performance in endurance athletes, considering the effect of post-exercise recovery time and sex. Thirty-three recreationally trained long-distance runners, 20 men and 13 women, participated voluntarily in this study. The participants performed the Léger test, moreover, the CMJ and handgrip strength tests were carried out before and after the running test and during different stages of recovery (at the 1st min of recovery (posttest1), 5th min of recovery (posttest2), and 10th min of recovery (posttest3)). Two-way analysis of variance revealed a significant improvement in the CMJ (pre-posttest1, p = 0.001) and handgrip strength (pre-posttest2, p = 0.017) during recovery time. The Pearson’s Chi-2 test showed no significant relationship (p ≥ 0.05) between sex and post-activation potentiation (PAP). A linear regression analysis pointed to heart rate recovery as a predictive factor of CMJ improvement (PAP). In conclusion, despite significant fatigue reached during the Léger test, the long-distance runners did not experience an impaired CMJ and handgrip strength performance, either men or women, achieving an improvement (PAP) in posttest conditions. The results obtained showed no significant relationship between sex and PAP. Moreover, significant effect of recovery after running at high intensity on CMJ performance and handgrip strength was found. Finally, the data suggest that PAP condition can be predicted by heart rate recovery in endurance runners.

exercise program of elderly women, in The 7th Annual Congress of the ECSS, P.0286/188, Editor. 2002: Athens. 16. Maybury M. J. Waterfield (1997) An investigation into the relation between step height and ground reaction forces in step exercise: a pilot study. Br. J. Sports Med., 31: 109-113. 17. Moreau N.G., M.J. Falvo, D.L. Damiano (2012) Rapid force generation is impaired in cerebral palsy and is related to decreased muscle size and functional mobility. Gait Posture, 35(1): 154-158. DOI: 18. Pecina M., I. Bojanic, M

Vaillancourt DE, Haibach PS, Newell KM. Visual angle is the critical variable mediating gain-related effects in manual control. Exp Brain Res 2006; 173: 742–750 10.1007/s00221-006-0454-2 16604313 Vaillancourt DE Haibach PS Newell KM Visual angle is the critical variable mediating gain-related effects in manual control Exp Brain Res 2006 173 742 750 Waugh CM, Korff T, Fath F, Blazevich AJ. Rapid force production in children and adults: Mechanical and neural contributions. Med Sci Sports Exerc 2013; 45: 762–771 23190586 10.1249/MSS.0b013e31827a67ba Waugh CM Korff T Fath F

sets, as well as an average PF of 900 N for one of its exercises, the IET is indeed a high-speed high-impact training device ( Caruso et al., 2018 ). With a small mass added to its sled and rapid force exertion, its repetitions are inherently ballistic. Impulses (D force/D time) from each repetition impart far different mechanical loading stimuli than standard exercise hardware. Thus, the IET may yield temporal adaptations to strength-based variables unlike those seen previously which, to date, have not been examined. Figures 1 and 2 show the overhead and side