12/28/2023 0 Comments Non reactivity exercises![]() ![]() An athlete’s ability to quickly and effectively move through the stretch-shortening cycle is important for a variety of sports.įor example, taking off in the long jump, or even changing direction in football both require the athlete to rapidly move through the stretch-shortening cycle. Why is the Reactive Strength Index important for sport?Īs the RSI demonstrates an athlete’s ability to quickly and effectively change from an eccentric to a concentric contraction, it, therefore, represents their ability to utilise the stretch-shortening cycle and their explosive capabilities during dynamic jumping activities (8). This suggests that the athlete’s ‘optimal’ box height for a DJ is 60 cm.įurthermore, as well as being a useful marker for measuring performance and training progress, the RSI tests are also commonly used to measure neuromuscular fatigue during competition periods in team sports (10, 11). Figure 1 provides a clear example of a performance drop-off after a given drop height – in this case at 80 cm. The incremental DJ-RSI can also be used to provide recommendations for an athlete’s optimal drop height for plyometric exercises (9). It demonstrates an athlete’s ability to rapidly change from an eccentric motion into a concentric muscular contraction and is an expression of their dynamic explosive vertical jump capacity (1). The RSI was developed to measure how an athlete copes and performs during plyometric activities by measuring the muscle-tendon stress and their reactive jump capacity (8).
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