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All Journal International Journal of Experimental Sports Science Research
Iin Pratiwi
Universitas Muhammadiyah Bone

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Analysis of Muscle Fibers of Blue Al-Junaidiyah Students Iin Pratiwi; Muhammad Arkanul Arba"
International Journal of Experimental Sports Science Research Vol. 2 No. 1 (2026): 30 January 2026
Publisher : Universitas Pejuang Republik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66968/hta5fp90

Abstract

Background: Muscle fiber type composition is a fundamental determinant of athletic performance and physical capacity. Identifying the predominant muscle fiber type in religious boarding school (pesantren) students provides valuable insights into their physical training needs. Objectives: This study aims to analyze the muscle fiber composition of 50 male students at Santri Al-Junaidiyah Biru Pesantren using the vertical jump test method as an indirect assessment tool. Methods: A descriptive quantitative approach was employed with a total sampling technique involving 50 male students aged 15–18 years. Muscle fiber type was assessed using the Bosco vertical jump protocol which differentiates Type I (slow-twitch) and Type II (fast-twitch) fibers based on jump performance indices. Results: The results showed that 56% of students (n=28) were classified as predominantly Type I (slow-twitch) muscle fiber, while 30% (n=15) were classified as Type II (fast-twitch), and 14% (n=7) showed mixed fiber composition. The mean jump index was 48.6 ± 6.2 cm. Conclusions: The majority of Santri Al-Junaidiyah Biru students have slow-twitch dominant muscle fibers, suggesting an inclination toward endurance-type activities. These findings have significant implications for designing physical education programs tailored to the students' physiological profiles.
The Effect of Sit Up Exercises on Abdominal Circumference Reduction of UPRI Sports Coaching Education Students Muhammad Arkanul Arba'; Iin Pratiwi
International Journal of Experimental Sports Science Research Vol. 2 No. 1 (2026): 30 January 2026
Publisher : Universitas Pejuang Republik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66968/qy76ky98

Abstract

Background: Abdominal circumference is one of the key anthropometric indicators of central obesity and health risk in young adults, including university students. Sedentary habits among sports coaching students who lack structured exercise programs contribute to increased abdominal fat accumulation. Objectives: This study aims to analyze the effect of sit-up exercise on the reduction of abdominal circumference in students of the Sports Coaching Education Program at Universitas Pejuang Republik Indonesia (UPRI) Makassar. Methods: A pre-experimental design with one-group pretest-posttest approach was applied to 30 male students selected through purposive sampling. The sit-up training program was conducted for 8 weeks, 3 sessions per week, with progressive frequency from 3 sets of 15 repetitions increasing to 3 sets of 25 repetitions. Abdominal circumference was measured using a non-elastic anthropometric tape at the level of the navel. Data were analyzed using paired t-test with a significance level of α = 0.05. Results: The mean abdominal circumference before the intervention was 86.74 ± 6.32 cm, which decreased to 83.12 ± 5.87 cm after the 8-week program, representing a reduction of 3.62 cm (p = 0.000 < 0.05). Conclusions: Sit-up exercise performed systematically and progressively for 8 weeks is effective in significantly reducing abdominal circumference in Sports Coaching Education students at UPRI Makassar.
Co-Authors Muhammad Arkanul Arba" Muhammad Arkanul Arba&#039;