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All Journal Contagion: Scientific Periodical Journal of Public Health and Coastal Health
Wahyudi, Agung
Faculty of Sports Sciences, Universitas Negeri Semarang
Health Professions Public Health

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The Influence of Short-Distance Sprint Training on Physical Condition and Speed Performance in Youth Volleyball Players Romandoni, Evi Saputri; Wahyudi, Agung; Ockta, Yovhandra
Contagion: Scientific Periodical Journal of Public Health and Coastal Health Vol 7, No 2 (2025): CONTAGION
Publisher : Universitas Islam Negeri Sumatera Utara, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30829/contagion.v7i2.24424

Abstract

Volleyball is a sport that requires high levels of speed and endurance, making targeted physical training essential for optimal performance. Sprint training over distances of 50 and 80 meters is one approach that can enhance both attributes. This study investigates the effects of 50-meter and 80-meter sprint training on the speed performance of volleyball players involved in extracurricular activities at MAN 2 Banjarnegara. A quantitative experimental design was employed, utilizing a Two-Group Pretest-Posttest framework. Participants were randomly assigned to two experimental groups: Group A (50-meter sprint training) and Group B (80-meter sprint training). Across 14 training sessions, including pretest and posttest assessments, data were collected using a 60-meter sprint test. Statistical analyses included normality tests (Kolmogorov-Smirnov and Shapiro-Wilk), homogeneity tests, and paired t-tests. Results demonstrated that both sprint training protocols significantly improved sprint performance. Group A exhibited a mean improvement of 0.35 seconds, while Group B showed a greater improvement of 0.77 seconds, with both outcomes achieving statistical significance (p < 0.05). These findings indicate that sprint training over both distances effectively enhances speed performance in volleyball playersThe study concludes that incorporating 50-meter and 80-meter sprint training into volleyball conditioning programs can positively impact players’ physical speed. Coaches and trainers are encouraged to integrate these sprint protocols to improve essential skills such as spiking, passing, and blocking. For comprehensive development, sprint training should be complemented with agility drills and aerobic endurance exercises to meet the multifaceted physical demands of the sport. Keywords: Volleyball, Physical Fitness, Extracurricular, Sports Student, Athletes.
Enhancing Vertical Jump Performance in Adolescent Female Volleyball Athletes: Effects of Squat Jumps and Knee Tuck Jumps for Health Promotion Widiyawanti, Aprillia Setia; Wahyudi, Agung; Ockta, Yovhandra
Contagion: Scientific Periodical Journal of Public Health and Coastal Health Vol 7, No 2 (2025): CONTAGION
Publisher : Universitas Islam Negeri Sumatera Utara, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30829/contagion.v7i2.24405

Abstract

This experimental study examines the effectiveness of two plyometric training methods, squat jumps and knee tuck jumps, in enhancing vertical jump performance among U-12 female volleyball athletes. Vertical jump ability plays a critical role in executing offensive techniques such as spiking and defensive maneuvers like blocking. Fourteen athletes from the Dissporsa Kendal volleyball club participated in the study and were assigned to two experimental groups through ordinal pairing. Group A underwent squat jump training, while Group B received knee tuck jump training, each over the course of 16 sessions. A pre-test/post-test design was employed to assess changes in vertical jump performance. Descriptive statistics indicated improvements in both groups. Group A’s average jump height increased from 27.83 cm to 31.50 cm (a 13.2% improvement), while Group B’s average rose from 27.17 cm to 30.58 cm (a 12.7% improvement). The mean increase in jump height was 3.67 cm for Group A and 3.41 cm for Group B. However, an independent samples t-test revealed no statistically significant difference between the post-test results of the two groups (p = 0.8306), suggesting that both training methods were equally effective in improving vertical jump performance. These findings support the inclusion of squat jumps and knee tuck jumps in youth training programs aimed at developing lower-body explosive power. Due to their simplicity and accessibility, these exercises offer practical benefits for coaches and trainers working with young athletes. Future research involving larger sample sizes and extended training durations is recommended to further investigate the long-term effects of plyometric training on athletic performance and injury prevention in youth sports. Keywords: Plyometric, Vertical Jump, Volleyball, Youth Athletes, Training.
Co-Authors Ockta, Yovhandra Romandoni, Evi Saputri Widiyawanti, Aprillia Setia