Effect of four weeks training on variability of Ground Reaction Forces during vertical jump in active young men

Vertical jump is seen in many sports activities and it use in many biomechanical researches. The purpose of this study was to investigate the effect of four weeks training on variability of Ground Reaction Forces (GRF) during vertical jump in active young men.
Twenty young men (Exercise group: agd: 21.20 ± 1.47 yrs., Height: 170±6 cm, Weight: 65.21±10.92 kg and Control group: age: 19.85±0.69 yrs, Height: 177±71 cm, Weight: 67.77±11.59 kg) participated in this study. GRF data were recorded before and after training protocol using force plate during the vertical jump maneuver. Coefficient of variation (CV) was calculated in 10 GRF curves pre and post training protocol for each subject using mean ensemble curve method.
The results of repeated measure showed no significant differences in CV in Mediollateral and vertical GRFs but Significant differences was observed in Anteroposterior GRF (p≤0.05).
It seems GRF variability is influenced by exercise. The variability in the GRF can be considered as an indicator of performance in the vertical jump.