The Effect of Squad Jump And Knee Tuck Jump On Leg Explosive Power of Volleyball Athletes

Abstract

Leg explosive power is a fundamental physical component that strongly influences performance in volleyball, particularly in executing jumping-based skills such as spiking, blocking, and serving. Plyometric training is widely recognized as an effective approach to enhance explosive power through neuromuscular adaptations. This study aimed to examine the effect of squat jump and knee tuck jump exercises on the leg explosive power of volleyball athletes at Mandala Club. The study employed a pre-experimental method using a one-group pretest–posttest design. The participants consisted of 14 volleyball athletes, all of whom were included as the research sample using total sampling. Leg explosive power was measured using the vertical jump test, a valid and reliable instrument commonly applied in volleyball performance assessment. The training intervention was conducted for six weeks, and data were analyzed using descriptive statistics and inferential analysis with a paired-sample t-test. The results showed that squat jump training increased the average vertical jump score from 49.00 cm in the pretest to 58.57 cm in the posttest, indicating an improvement of 19.53%. Meanwhile, knee tuck jump training increased the average score from 59.00 cm to 66.71 cm, representing an improvement of 13.07%. Statistical analysis revealed that both squat jump and knee tuck jump exercises produced significant improvements in leg explosive power (t > t-table, p < 0.05). In conclusion, squat jump and knee tuck jump exercises are effective plyometric training methods for improving leg explosive power in volleyball athletes. These findings provide empirical evidence supporting the integration of simple, equipment-free plyometric exercises into volleyball training programs, particularly at the club development level.