Effect of Eight Weeks of Jump-Training Programs on Selected Factors of Kinematic in Fatigue Conditions in Men's Handball Player Premier League at the Risk of Anterior Cruciate Ligament Injury

Fatigue can lead to harmful changes in landing kinematics and put the knee joint in a position that increases chances of injury to the anterior cruciate ligament. The purpose of the present study was to investigate the effect of eight weeks of jump training on selected kinematic factors conditions in Men's Handball Player Premier League who are at the Risk ofAnterior Cruciate Ligament Injury.

In the current study, 30 handball players in the Iranian Premier League were selected purposefully and randomly divided into two control and experimental groups. Prior to and eight weeks after the exercises (3 sessions per week) at the same time and place, after determining the participants' dominant leg and applying the fatigue protocol, they performed a single-leg landing jump. Kinematic factors of the lower limb and trunk were recorded during the single-leg landing using Motion Analysis device to investigate movements in the sagittal and frontal motion plate. During the research period, the control group did not perform any intervention training program. ANCOVA was run to analyze the study hypotheses in SPSS, version 20.

The results showed that after eight weeks of training in fatigue conditions, knee, hip, and trunk flexions increased in the exercise group (respectively p=0.001, p=0.002, p=0.001,) while no significant decrease was observed in lateral trunk tilt, knee valgus, and tibial torsion.

According to the results, plyometric exercises may be effective in preventing anterior cruciate ligament injury. These exercises prevent mechanisms that cause damage to the anterior cruciate ligament by affecting the kinematic angles of the joints and by increasing the muscular feedforward activity and the development of the entire musculoskeletal system.