Effectiveness of Monitoring Neuromuscular Fatigue in Australian Football Players Using the Countermovement Jump

Muscular fatigue, encompassing both short-term and long-term fatigue, presents a critical challenge in sports like Australian Football (AF) due to its impact on athlete performance and preparation readiness. Within the elite training environment, the intricacies of prolonged neuromuscular fatigue underscore the necessity for practical monitoring methods, like the countermovement jump (CMJ), to comprehend athlete readiness, performance, and the dynamic aspects of player load and positional changes. This research investigates how CMJ performance changes in professional AF athletes during the pre-season and in-season phases, taking into consideration the possible impact of training load and athlete positions. Forty-two elite AF athletes from a professional AF club underwent standardized CMJ testing throughout the pre-season and the first eight matches of the 2023 competitive season. Significant time effects were observed, with a 4% increase in mean jump height among Midfielders from the early to late pre-season, accompanied by a 7% reduction in countermovement depth. Changes in CMJ height performance following the first eight matches were negligible and non-significant; however, variables describing how athletes maintained this performance did substantially change. The study outcomes highlight the need to interpret changes in how any given performance was achieved more closely than an outcome variable alone. Doing so offers insights for targeted training interventions and informed coaching decisions that could assist with optimizing performance throughout the competitive season.