Abstract

Background. The aim of this study was to identify the loads that occur when landing from different heights, achieved through analysis of selected kinetic and dynamic parameters in men without injuries of the musculoskeletal system. Understanding the characteristics of this type of transportation can play an important role in assessing the progress of rehabilitation after lower limb injuries.Material and methods. The sample comprised 26 men aged 20 to 26 years without lower limb injuries, who performed landing at three heights: 0.1, 0.2 and 0.3 m. For quantitative and qualitative assessment biomechanical studies were performed using motion measurement system, a dynamometric platform for ground reaction force measurement for the vertical component and a module for electromyography.Results. The maximum value of the ground reaction forces for the vertical component during the jump down on both lower limbs from 0.3 m increased to about 2.2 weight. The most active muscles during landing were: m. vastus medialis of the thigh (both limbs) and gastrocnemius, as demonstrated in the study of surface electromyography.Conclusions. 1. No statistically significant (up to 4%) differences were found in the values of maximum ground reaction forces for the vertical component between the left and right lower limb. 2. A positive correlation was found between the ground reaction force, and the height from which the subjects jumped and between the ground reaction force and muscle tension. 3. Muscle tone apparently increased during free standing before landing compared to the jump phase.

Key words:

Methodology, jump down, ground reaction force, muscle tension