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All Journal Jorpres (Jurnal Olahraga Prestasi)
Muhammad Rizqi Eka Putra
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Variances in the effect of caffeine in arabica coffee and robusta towards the aerobic endurance and the heart rate of football players from persatuan sepak bola condong catur FC (PSCC FC) Ahmad Sujiono; Hardopo Putro, Kukuh; Az Zahra Aulia Ramadhanti; Dhany Diva Pradana; Nadine Nata Safitri; Kisy Jastin Tjeleni; Muhammad Rizqi Eka Putra; Mohamad Althaf YA Ala; Andina Nuary Fitra Nugroho; Shaq Santosa; Dwi Wulansari
Jorpres (Jurnal Olahraga Prestasi) Vol. 21 No. 2 (2025)
Publisher : Departement of Sports Coaching, Faculty of Sports Sciences, Universitas Negeri Yogyakarta

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This research seeks to ascertain the variances in the effects of caffeine from Arabica and Robusta coffee on endurance and the heart rate. This research was a descriptive comparative study with 45 samples, utilizing a complete sampling technique followed by random sampling to categorize them into three groups. The data collecting method involved the measurement of the resting heart rate, post-bleep test, recovery, and during the bleep test. An independent sample t-test was employed to examine the differences in VO2max values and heart rates between Arabica and Robusta coffee. The research findings indicate substantial variations in the endurance capabilities of the Arabica and Robusta groups, with a computed t-value of 8.335 exceeding the t-table value of 2.048, and a significance level of 0.000, which is less than 0.05. The disparity in the bleep test results between the Arabica and Robusta groups is at 6.613. The resting pulse rates of the Arabica and Robusta groups show no significant difference, with t values of pulse 0 at -0.277, pulse 1 at -1.248, pulse 2 at -1.430, and pulse 3 at -0.929, compared to a t table value of 2.048. The significance values are 0.784, 0.223, 0.164, and 0.361. 0.05 The recovery pulse rate of the Arabica and Robusta groups show no significant difference, with a t count of -0.929 (t table 2.048) and a significance value of 0.361. 0.05 The disparity in the bleep test results between the Arabica and Robusta groups is at 2.933. The recovery pulse of the Arabica and Robusta groups show no significant difference, with a t value of 1.910 for pulse 5 and 0.624 for pulse 6, compared to a t table value of 2.048. Has a significance value of 0.066, 0.538 > 0.05. Arabica coffee enhances endurance more markedly than Robusta coffee. Robusta coffee can elevate resting heart rate and heart rate following a bleep test. Robusta coffee might also expedite the recovery pulse more than Arabica coffee.
The relationship between self-confidence and concentration with the ability to smash volleyball athletes 12-17 years old in pervas club Indah Zunita; Hardopo Putro, Kukuh; Nadine Nata Safitri; Muhammad Rizqi Eka Putra; Muhammad Izzudin Al Haq; Faros Shouma Askalani; Edward Viktoryan Raymon Kalaibin; Ananda Kirani Yulia; Lavaya Yuri Andjan; Umair Ansharullah Azzam
Jorpres (Jurnal Olahraga Prestasi) Vol. 21 No. 2 (2025)
Publisher : Departement of Sports Coaching, Faculty of Sports Sciences, Universitas Negeri Yogyakarta

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This study aims to determine (1) The relationship between self-confidence and the ability to smash volleyball athletes 12-17 years at the Pervas club. (2) The relationship between concentration and the ability to smash volleyball athletes 12-17 years at the Pervas club. (3) The relationship between selfconfidence and concentration with the ability to smash volleyball athletes 12-17 years old at the Pervas club. This research is quantitative research with correlation. The study population was volleyball 12-17 years at the Pervas club, totaling 54 athletes. The sampling technique used purposive sampling. The criteria are (1) not in pain, (2) aged 12-17 years, (3) have participated in matches, (4) still actively practicing. Based on these criteria, there were 46 athletes who met. Self-confidence and concentration instruments use questionnaires, while smash ability uses smash ability tests. Data analysis using multiple regression. The results showed that: (1) There is a significant relationship between self-confidence and smash ability in volleyball athletes 12-17 years old at the Pervas club, with a t value of 2.639> t table 2.017, sig. 0.012 and an effective contribution of 14.14%. (2) There is a significant relationship between concentration and smash ability in volleyball athletes 12-17 years old at Pervas club, with t count 2.080 > t table 2.017, sig. 0.044 and an effective contribution of 9.36%. (3) There is a significant relationship between confidence and concentration with smash ability in volleyball athletes 12-17 years old at Pervas club, with F count 6.615 > F table (2; 43) 3.21 and sig. 0.003 and an effective contribution of 23.50%.
Co-Authors Ahmad Sujiono Ananda Kirani Yulia Andina Nuary Fitra Nugroho Az Zahra Aulia Ramadhanti Dhany Diva Pradana Dwi Wulansari Edward Viktoryan Raymon Kalaibin Faros Shouma Askalani Hardopo Putro, Kukuh Indah Zunita Kisy Jastin Tjeleni Lavaya Yuri Andjan Mohamad Althaf YA Ala Muhammad Izzudin Al Haq Nadine Nata Safitri Shaq Santosa Umair Ansharullah Azzam