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Cahniyo Wijaya Kuswanto
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Journal of Coaching and Sports Science
Published by Foundation of Advanced Education
ISSN : 29631459     EISSN : 29631483     DOI : 10.58524/jcss.v1i2.
Core Subject : Education, Social,
Education Social Sciences
Journal of Coaching and Sports Science is an academic journal that aims to provide education about coaching and sports science. In this journal, theory and practice in coaching will be integrated with sports science as a critical reflection of coaching practice, as well as improving sports academics and coaches to help athletes acquire skills through sports science. The vision of this journal uncovers, understands, and develops the processes involved in sports coaching and the development of sports science.
Arjuna Subject : Umum - Umum
Articles 83 Documents
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Relative age effect in volleyball: Does early birth influence elite success? Kamesh Arul Doss; Gokul Raj; Swamynathan Sanjaykumar; Shinto Vadakkumchery Poulose; Igor Grygus; Yuliya Kalmykova; Priyanka Rana
Journal of Coaching and Sports Science Vol. 5 No. 3 (2026): In Press: Journal of Coaching and Sports Science
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jcss.v5i3.1272

Abstract

Background: The Relative Age Effect (RAE) refers to the unequal representation of athletes according to their birth timing within a selection year. This phenomenon may influence talent identification, athlete development, and access to competitive opportunities. However, limited evidence is available regarding the relationship between RAE, playing-position distribution, and tactical-technical performance among competitive university volleyball players in India. Aims: This study examined the presence of RAE and its association with playing positions and tactical-technical performance among male volleyball players competing at the national inter-university level in Tamil Nadu, India. Methods: A cross-sectional observational design involved 160 male players from universities in Tamil Nadu who participated in national inter-university tournaments during the 2024–2025 season. Participants were classified into four birth quartiles: Q1 (January–March), Q2 (April–June), Q3 (July–September), and Q4 (October–December). Playing positions and performance indicators, including attack efficiency, block success, serve pressure, reception efficiency, and overall performance index, were analyzed using chi-square goodness-of-fit tests and the Kruskal–Wallis test. Results: A significant unequal distribution of players was observed across the birth quartiles (χ² = 10.40, p = 0.015, Cohen’s w = 0.25). Players born in Q1 represented 32.5% of the sample, whereas those born in Q4 accounted for 17.5%, with Q1 players being approximately 1.86 times more likely to be represented than Q4 players. Significant position-specific differences were identified among opposite hitters (χ² = 8.11, p = 0.04) and middle blockers (χ² = 9.02, p = 0.02). However, no significant differences were found across birth quartiles in attack efficiency, block success, serve pressure, reception efficiency, or overall performance index (p > 0.05; η² = 0.008–0.014). Conclusion: RAE remained evident in player representation and positional distribution but was not associated with tactical-technical performance. These findings suggest that birth timing may influence selection opportunities more than actual competitive ability. Talent identification should therefore use multidimensional criteria and prioritize athletes’ long-term developmental potential rather than age-related physical advantages.
Supervised progressive resistance training in adolescent girls with primary dysmenorrhea Sufiyan Adam Abdulahi; Dessalegn Wase Mola; Ricardo Ricci Uvinha; Alemmebrat Kiflu Adane; Abdi Gudeta Taye; Tariku Temeche Mare; Md. Hamidur Rahman; Nugroho Susanto; Agam Akhmad Syaukani
Journal of Coaching and Sports Science Vol. 5 No. 3 (2026): In Press: Journal of Coaching and Sports Science
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jcss.v5i3.1345

Abstract

Background: Primary dysmenorrhea is a gynaecological condition  amongadolescents and is accompanied by depression and anxiety. Although physical activity is recommended as a non-pharmacological strategy, evidence regarding changes following supervised progressive resistance training among adolescents remains limited. Aims: This study aimed to examine changes in depression and anxiety symptoms following an 8-week supervised progressive resistance training program among adolescent girls with moderate-to-severe primary dysmenorrhea in Haramaya Town, Ethiopia. Methods: A one-group pre-test–post-test quasi-experimental design was conducted with 41 adolescent girls aged 15–20 years from public high schools. Participants completed a supervised resistance training program three times weekly for eight consecutive weeks. Depression and anxiety symptoms were assessed using the Beck Depression Inventory-II (BDI-II) and Beck Anxiety Inventory (BAI) during days 1–3 of the menstrual cycle at baseline and during the first post-intervention menstrual cycle. Data were analyzed using Shapiro–Wilk tests, paired-samples t-tests, and Cohen’s dZ for within-participant effect sizes. Result: Significant pre-to-post reductions were observed in both outcomes. Mean BDI-II scores decreased from 32.54 ± 6.86 to 10.44 ± 7.25, t(40) = 16.38, p < .001, dz = 2.56. Mean BAI scores decreased from 33.22 ± 7.16 to 11.66 ± 7.75, t(40) = 19.75, p < .001, dz = 3.08. Descriptively, most participants shifted from moderate-to-severe depression and anxiety categories at baseline to minimal symptom categories after the program. Conclusion: Participation in the 8-week supervised progressive resistance training program was associated with reductions in depression and anxiety symptoms. However, because the study did not include a control group, the findings should not be interpreted as evidence of causality. Supervised progressive resistance training may represent a promising complementary non-pharmacological approach for supporting psychological well-being among adolescents with primary dysmenorrhea.
The effects of high-intensity interval training on lower-limb strength, VO₂max, vertical jump performance, and heart rate in college athletes Japhet Ndayisenga; Lionel Nzohabonimana
Journal of Coaching and Sports Science Vol. 5 No. 2 (2026): Journal of Coaching and Sports Science
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jcss.v5i2.1386

Abstract

Background:  High-intensity interval training (HIIT) is a time-efficient, evidence-based modality capable of inducing substantial simultaneous physiological adaptations across multiple fitness domains. Despite a growing global evidence base for HIIT efficacy, scientifically validated programs for athletes in sub-Saharan African contexts, particularly Burundi, remain absent from the peer-reviewed literature. Aims: This study designed, validated, and evaluated the effectiveness of a five-week HIIT program targeting lower limb strength, maximal oxygen uptake (VO₂max), vertical jump performance, and resting heart rate (RHR) among college athletes. Methods: A pre-experimental one-group pre-test post-test design was employed with 72 college athletes (n = 72). The HIIT program comprised four specialized modules delivered in three sessions per week over five weeks. Pre- and post-test assessments used the timed wall-sit test (lower limb strength), Beep Test and Cooper's 12-minute run (VO₂max), Sargent Jump Test and vertical force plate (vertical jump), and stopwatch pulse measurement (RHR). Data normality was confirmed via the Shapiro–Wilk test; paired-samples t-tests were conducted via IBM SPSS v23. Result: Statistically significant improvements were observed for all four variables following the intervention: lower limb strength (t(71) = −10.267, p < .001; +91.10%; Cohen's d = 1.210), VO₂max (t(71) = −12.070, p < .001; +14.51%; d = 1.422), vertical jump (t(71) = −17.763, p < .001; +23.82%; d = 2.093), and resting heart rate (t(71) = 18 Conclusion: The five-week multi-component HIIT program produced highly significant, large-effect improvements across all four fitness domains in 72 university students, constituting the first large-sample, institutionally validated HIIT program in the Burundian sports science context and offering a scalable, evidence-based model for athletic physical development in resource-limited African settings.

Page 9 of 9 | Total Record : 83

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