A randomized controlled trial of unresisted vs. heavy resisted sprint training programs: effects on strength, jump, unresisted and resisted sprint performance in youth rugby union players - Zabaloy, S.; Healy, R.; Pereira, L. A.; Tondelli, E.; Tomaghelli, L.; Aparicio, J.; Vega, F.; Medrano, J.; Giráldez, J.; Comyns, T.; Freitas, T. T.; Loturco, I. (Journal of Human Kinetics, 2025)