To assess the impact of different repeated high-intensity effort (RHIE) bouts on player activity profiles, skill involvements and neuromuscular fatigue during small-sided games.
Twenty-two semi-professional rugby league players (age 24.0 ± 1.8 years; body mass 95.6 ± 7.4 kg) participated in this study. During 4 testing sessions, players performed RHIE bouts that each differed in the combination of contact and running efforts, followed by a 5 min 'off-side' small-sided game before performing a second bout of RHIE activity and another 5 min small-sided game. Global positioning system microtechnology and video recordings provided information on activity profiles and skill involvements. A countermovement jump and a plyometric push-up assessed changes in lower- and upper-body neuromuscular function after each session.
Following running dominant RHIE bouts, players maintained running intensities during both games. In the contact dominant RHIE bouts, reductions in moderate-speed activity were observed from game 1 to game 2 (ES = -0.71 to -1.06). There was also moderately lower disposal efficiencies across both games following contact dominant RHIE activity compared with running dominant activity (ES = 0.62-1.02). Greater reductions in lower-body fatigue occurred as RHIE bouts became more running dominant (ES = -0.01 to -1.36), whereas upper-body fatigue increased as RHIE bouts became more contact dominant (ES = -0.07 to -1.55).
Physical contact causes reductions in running intensities and the quality of skill involvements during game-based activities. In addition, the neuromuscular fatigue experienced by players is specific to the activities performed.
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