Effect of Plyometric Push-Up Training on Arm Muscle Strength in Junior High School Extracurricular Activities in Mataram
DOI:
https://doi.org/10.26858/cjpko.v17i3.517Keywords:
Training; Plyometric; Push-Up; Arm Muscle; StrengthAbstract
This study investigates the effect of plyometric push-up training on arm muscle strength among junior high school students participating in extracurricular activities. A quasi-experimental pretest-posttest control group design was employed involving 30 male students aged 12-15 years from SMP Negeri 1 Mataram, Mataram, Indonesia, equally divided into experimental (n=15) and control (n=15) groups with normal BMI and no prior upper body injuries. The experimental group underwent structured plyometric push-up training (3 sets × 10 repetitions, progressively increasing, 3 sessions/week for 6 weeks), while the control group received active rest and general sports theory sessions. Arm muscle strength was measured using the 30-second push-up test, validated with Cronbach Alpha reliability of 0.87, administered by two independent raters pre- and post-intervention. Data analysis utilized SPSS v26, confirming normality (Shapiro-Wilk p>0.05) and homogeneity (Levene p=0.412). Paired t-test results revealed significant improvements in the experimental group (pre: M=18.47, SD=3.24; post: M=27.27, SD=3.82; t=-10.392, p=0.001, effect size d=2.41), while the control group showed moderate gains (pre: M=17.60, SD=3.41; post: M=19.67, SD=3.54; t=-3.015, p=0.012, d=0.65). Independent t-test confirmed significant between-group differences post-intervention (t=-3.456, p=0.003), with the experimental group achieving 47.8% improvement versus 11.8% in controls
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