Taufik Yudi Mulyanto, Muhammad Ishaq Gery, Andi Miftahul Jannah, Yudi Dwi Saputra, Dewangga Yudhistira
This study aimed to test the maxex (maximal exercise) training method: (1) the difference in the effect of maxex and control on leg muscle power, (2) the difference between vertical jump times (quick and slow) on leg muscle power, (3) the interaction between the method and quick and slow vertical jump times on leg muscle power. The research method used was a 2x2 factorial experiment. The sample consisted of 40 volleyball players aged 17 years and divided into 20 control groups and 20 experimental groups, with heights ranging from 169 to 179 cm and weights ranging from 60 to 70 kg. The research instrument was a vertical jump with the Harman formula to calculate power, and a Canon 1200D camera was entered into the Kinovea 0.8.1.5 application to determine vertical jump time. The data analysis technique was Two-Way Anova assisted by SPSS version 23. (1) There is a significant difference in the effect of maxex training and the control group on leg muscular power (F 51.495, sig 0.000 <0.05) (hypothesis accepted). (2) There is a significant difference between quick and slow vertical jump times on leg muscle power (F 40.480, sig 0.000 < 0.05) (hypothesis accepted). (3) There is no interaction between the two groups and vertical jump times (quick and slow) on leg muscle power (F 3.662, sig 0.064 > 0.05) (hypothesis rejected). Maxex training improves leg muscle power in adolescent volleyball players. The absence of this significant interaction shows that the effect of maxex does not differ between athletes with quick and slow jump times.. © 2026 by the authors.
Faculty of Education, Universitas Muhammadiyah Jakarta, Indonesia; Faculty of Sports and Health Science, Universitas Negeri Surabaya, Indonesia
