Effects of an Integrated Balance and Muscle Tension Control Training Program on Kinematic Variables and Defensive Accuracy in Volleyball Players

Objective This study aims to investigate the impact of integrated training on kinematics variables and defensive accuracy in volleyball, focusing on enhancing balance and muscle tension control through proprioceptive neuromuscular facilitation (PNF) exercises.Methods The sample consisted of 14 male volleyball athletes from the first volleyball league of Al-Jaish Sports Club were divided into experimental (n=7) and control group (n=7).In the pre-and post-intervention periods, dynamic balance, muscle tension control and kinematic variables (during a lateral reaching task) as well as defensive performance accuracy upon fatigue onset of recoil laser strikes were assessed.Exposure the intervention program was carried out for six weeks, and the following measuring tools were used to assess performance, Y-Balance Test as well as sEMG and kinematic variables using Kinovea. ResultsCompared with the control-group, individuals in the experimental-group demonstrated significantly improved performance at balance (Y-Balance Test, Cohen's d = 1.42), muscle activity and tension control (sEMG, Cohen's d = 1.38) and defensive ability accuracy (Cohen's d = 1.60).Kinematic variables revealed moderate to large enhancements in knee, hip, shoulder, elbow ankle and trunk angles where effect size ranged from 1.03 to 1.49 (Cohen's d).Control group, as expected, showed mild changes in all studied variables.Conclusion The combined training program enhanced volleyball players' biomechanical efficiency and defensive performance, highlighting its potential to boost performance, reduce injury risk, and improve coaching effectiveness.