Abstract

Purpose: Dynamic loads during landings of determined by the ground reaction forces (GRFs) may elaborate internal loads and increase the risk of overload knee injuries as the result of performing volleyball jumps many times. The study was conducted a biomechanical assessment of dynamic loads indicators in female volleyball players for the motion sequence of take-off - landing in blocks and attacks. Methods: Twelve professional female volleyball players participated in the study. Blocks and attacks were filmed by two cameras. GRFs vs. time graphs were recorded with the use of a force platform. Values of dynamic loads indicators in terms the relations of peak of vertical component of GRF, build-up index this force (BIF) and power output (P) during landing to the vGRF, BIF and P during take-off (L/T) were calculated. Results: The statistically significant (p<0.05) highest values L/T indicators were recorded for back row attack spikes: 2.4 (vGRF), 12.2 (BIF) and 3.1 (P). In the case blocks, slide attack spikes and attack line spikes results these variables were in range: 1.8÷2.1, 5.9÷7.6 and 2.1÷2.9, respectively. Conclusions: The reduction of GRFs during landings contribute to decreasing the level of the loads indicators L/T which should minimize of the incidence of anterior cruciate ligament and patellar tendon injuries in female volleyball players.

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