ABSTRACT
Plyometric training describes exercises that utilise stretch-shortening cycles of muscle actions. Training regimens that employ plyometric drills — such as bounding, hopping and drop-jumping — are employed by specialists in sprinting, jumping, gymnastics and other sports that engage the involved muscles eccentrically prior to forceful concentric actions. Due to the stretch-shortening loads employed during intense actions such as sprinting and jumping during games play, it is thought that plyometric training would be of benefit to football players. As repeated eccentric muscular actions cause delayed onset muscle soreness which peaks 2–3 days following execution of plyometric drills (Boocock et al., 1988), it is not clear whether this form of training would have any advantage when introduced during the competitive season . This study aimed to investigate the efficacy of a regimen of plyometric drills using professional Rugby League players within their competitive season.
