F-12M Free Communication/Poster Exercise Testing
Accurate assessment of training-induced improvements in muscular performance is important in elite sports, and in sports medicine rehabilitation. Isolated muscular function is frequently evaluated using isokinetic or isometric procedures, although the movement patterns do not resemble those of sports and/or daily life. It may thus be desireable to quantify muscular performance that includes the stretch shortening cycle where a concentric contraction is preceeded by an eccentric contraction.
To evaluate the reproducibility of selected force and power parameters obtained during counter-movement jumping (CMJ).
16 subjects of different training status performed 6 CMJ's during standardized conditions on a force plate (AMTI). Three similar test rounds each separated by 3 days were completed (1 familiarization day, day 2 and day 3). Jump height was determined by integration of the force signal, and the maximal jump height attempt on day 2 and 3 were chosen for further analysis. Reproducibility was investigated for jump height, functional jump power, peak concentric- and eccentric force by calculating R2 and CV for repeated measurements.
Data are presented as means±SD on day 2 and 3 respectively: Jump height: 32.6±5.3cm, 32.9±5.6cm, R2=0.91, CV=4.08%. Functional jump power: 2133±401W, 2202±438W, R2=0.95, CV=4.78%. Peak concentric force: 1874±302N, 1920±344N, R2=0.88, CV=4.21%. Peak eccentric force: 1863±340N, 1890±360N, R2=0.89, CV=4.60%.
Despite that the CMJ is a complex neuromuscular movement task, reproducible data with respect to jump height, peak eccentric/concentric force and functional jump power were observed. CMJ force plate analysis may thus be considered a functional alternative to more conventional methods of quantifying neuromuscular function, and an appropriate tool for evaluating effects of training aimed at improving performance and function.