Experimental protocol

Each participant completed 3 sessions separated by 5 to 7 days of rest. Each session was preceded by a standard warm-up procedure (5 min cycling and 5 min of calisthenics and dynamic stretching). The first testing session included anthropometric measurements followed by MVC testing and the familiarisation with the loaded and unloaded jumps. The familiarisation was repeated during the second session preceded by 1RM squat testing, while the third session served for the gathering of data. The participants completed 28 jumps per session (7 loading magnitudes × 2 jump types × 2 trials) and the second trial was taken for further analysis. The sequence of loading magnitudes and jump types were block randomised to avoid the effect of different orders across the groups. Note also that conducting only 2 trials per loading magnitude allowed testing the jumps within a single experimental session without dealing the effect of fatigue.