The Effectiveness of Different Combinations of Plyometric Training on Increasing Muscle Strength and Power in Healthy Adolescents Students

This study aims to assess the impact of plyometric training on increasing leg muscle strength and explosive power. The research method applied is quasi-experimental research with pre-test and post-test design. The research subjects were divided into three groups, consisting of 11 students each. The first group (K1) received a combination of squat jump and skater hops exercise, K2 received a combination of a jump for height and ins and outs exercise, while K3 received conventional training. All subjects were then instructed to perform a six-week respected training program consisting of three sessions a week, making it a total of 18 sessions. The intensity was set at 60% RM and gradually increased to 80% RM. Pre-test and post-test on strength and power were obtained using Leg Dynamometer and Jump MD. Data were presented descriptively and bivariate analysis was done using SPSS 23 for Windows. Paired sample t-test showed that each group had a significant increase (p < 0.05) after six weeks of treatment, with the highest improvement in strength and power observed in K1 ( strength = 11.57%, power = 7.57%). Meanwhile, K3 had the smallest but significant increase in both strength and power. Based on the aforementioned explanation, it can be concluded that subjects assigned to PT had a greater increase compared to those in the control group. It indicated that PT induces adaptations in neural and musculoskeletal systems, which lead to producing greater muscle force, resulting in higher gain in measured variables.