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All Journal Journal Coaching Education Sports Bulletin of Community Engagement Journal of Coaching and Sports Science
Muhammad Ishak
Universitas Negeri Makassar, Indonesia
Religion Arts Humanities Education Social Sciences Other

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The Effect of Vitamin-C Supply on Cardiorespiratory Endurance in Hockey Athletes Syahruddin; Muhammad Ishak; Andi Ridwan; Sahabuddin Sahabuddin
Journal Coaching Education Sports Vol. 5 No. 2 (2024)
Publisher : Program Studi Pendidikan Kepelatihan Olahraga Fakultas Ilmu Pendidikan Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/vvnr6g82

Abstract

This study is an experimental study aimed at determining the effect of vitamin C administration on cardiorespiratory endurance in UNM hockey athletes. The independent variable in this study is the administration of vitamin C, while the dependent variable is cardiorespiratory endurance. The population in this study were all male Hockey athletes of the Faculty of Sport Sciences, Makassar State University, while the sample was 14 male Hockey athletes from UNM. The data collection technique used was a multistage fitness test or bleep test. Data analysis used descriptive statistical analysis techniques and statistical analysis techniques. The results of descriptive statistics were obtained from the results of tests given to UNM hockey athletes. The results of statistical analysis by conducting hypothesis testing using the Paired Sample T-test on the post-test showed that the probability value = 0.007 so it was smaller than the significance level value of 5% (0.007 <0.05). The conclusion of this study shows that there is a significant effect of vitamin C administration on cardiorespiratory endurance in UNM hockey athletes.
Dampak Latihan Kondisi Fisik Terintegrasi Terhadap Peningkatan Biomekanika dan Efektivitas Smash Bulutangkis Remaja di Klub Kota Makassar Muhammad Ishak; Syahruddin; Sahabuddin; Muh. Adnan Hudain
Bulletin of Community Engagement Vol. 6 No. 1 (2026): Bulletin of Community Engagement
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/bce.v6i1.1700

Abstract

The smash is a key attacking technique in badminton, heavily influenced by the athlete's biomechanical efficiency and physical fitness. However, at the youth level, club training programs are often fragmented and do not systematically integrate the development of explosive strength, core stability, and neuromuscular coordination. This study aims to analyze the impact of integrated physical conditioning training on improving biomechanical parameters and smash effectiveness in youth badminton athletes at a Makassar City club. The study used a quasi-experimental design with a randomized pretest-posttest control group design. The sample size was 60 athletes (30 experimental and 30 control). The intervention was conducted for 8 weeks, administered three times per week. The variables measured included trunk rotation, shoulder angular velocity, racket head velocity, shuttlecock speed, smash accuracy, vertical jump, core stability, and agility. Data were analyzed using t-tests and effect size (Cohen's d) at a significance level of 0.05. The results showed significant improvements in the experimental group: trunk rotation (+17.7%), shoulder angular velocity (+17.0%), racket-head velocity (+18.5%), shuttlecock speed (+14.4%), and smash accuracy (+36.5%) (p < 0.05; large effect size). There was a strong correlation between increases in vertical jump and racket-head velocity (r = 0.72). It was concluded that integrated physical conditioning training effectively improves biomechanical efficiency and smash performance in adolescent athletes and is recommended in evidence-based coaching models.
Multi-domain physical fitness profiles and machine learning classification by sport category across 13 competitive sports Sahabuddin; Syahruddin; Muhammad Ishak; Muflih Wahid Hamid; M Rachmat Kasmad
Journal of Coaching and Sports Science Vol. 5 No. 3 (2026): Journal of Coaching and Sports Science
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jcss.v5i3.1332

Abstract

Background: Comparative multi-sport fitness profiling using a common institutional assessment framework remains limited in Southeast Asian competitive sport. Aims: To compare multi-domain fitness profiles across 13 sports grouped into four sport categories and to evaluate machine-learning classification of sport category. Methods: This cross-sectional STROBE-reported study included 197 KONI athletes (137 males, 60 females; age 20.6 ± 5.8 years). Standardized procedures were used within applicable sport groups, although several tests were category-dependent. Athletes were grouped as Combat (n=69), Team (n=72), Individual Technical (n=37), and Precision/Shooting (n=19). Between-category analyses and Random Forest (RF) and Linear Discriminant Analysis (LDA) with 5-fold out-of-fold cross-validation were performed. Results: The largest between-category effects were observed for vertical jump (η²=0.438, p<.001), the Bleep Composite/estimated VO₂max signal (η²=0.217, p<.001), and sit-up endurance (η²=0.199, p<.001). RF achieved 79.7% accuracy and macro-AUC=0.907; the three largest Gini importances in the final nine-variable model were vertical jump (0.211), Bleep Composite (0.162), and push-up endurance (0.144). Conclusion: Multi-domain fitness patterns differed across the four administrative sport categories, but age, maturation, sex composition, and category-linked test availability constrain interpretation. The classifier is exploratory and requires external validation; the findings describe already-trained athletes and do not establish prospective talent-identification validity.
Co-Authors Andi Ridwan M Rachmat Kasmad Muflih Wahid Hamid SAHABUDDIN SAHABUDDIN Sahabuddin Sahabuddin Syahruddin