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All Journal Jurnal Silvikultur Tropika (JST) Jurnal Penelitian Hutan dan Konservasi Alam Jurnal Penelitian Hutan Tanaman Syntax Literate: Jurnal Ilmiah Indonesia NUSANTARA : Jurnal Ilmu Pengetahuan Sosial JURNAL CRANKSHAFT Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering Jurnal Maenpo : Jurnal Pendidikan Jasmani Kesehatan dan Rekreasi Jurnal Konversi Energi dan Manufaktur Edu Sportivo: Indonesian Journal of Physical Education Bima Loka: Journal of Physical Education Indonesian Journal of Sport Management Jurnal Pedagogi Olahraga dan Kesehatan Public Health and Safety International Journal (PHASIJ) Engineering and Technology International Journal (EATIJ) Jurnal Pendidikan Indonesia (Japendi) AMMA : Jurnal Pengabdian Masyarakat Indonesian Journal of Research in Physical Education, Sport, and Health
Cahyo Wibowo
Departemen Silvikultur, Fakultas Kehutanan Institut Pertanian Bogor
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Screen time, physical activity, and VO₂max in Indonesian vocational school adolescents (aged 15–17): A cross-sectional study Wibowo, Cahyo; Nopiyanto, Yahya Eko; Kinasih, Angkit; Kombong, Asarya Reno; Pujianto, Dian; Insanistyo, Bayu
Indonesian Journal of Research in Physical Education, Sport, and Health Vol. 3 No. 2 (2025): Indonesian Journal of Research in Physical Education, Sport, and Health (IJRPES
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um086v3i22025p62-71

Abstract

Physical activity and screen time influence many adolescent' fitness problems. This research aims to determine the relationship between screen time and physical activity on adolescent students' cardio-respiratory endurance (VO2max). This research used observational analysis with a cross-sectional study involving 70 teenage students at an Information and Network Technology Vocational School consisting of male and female teenage students. The Screen Time of Adolescents (QUEST) questionnaire was used to assess screen time, the physical activity instrument used the Global Physical Activity Questionnaire (GPAQ v2.0) to assess physical activity levels, and the VO2max instrument used the 20-meter Multistage Fitness Test (MFT). The data analysis technique uses the Pearson correlation test and continues with linear regression using the IBM SPSS statistics 25 application. This analysis is used to determine how significant the relationship between variables. Physical activity has a significant relationship with VO2max (p<0.05), while screen time does not have a direct relationship with VO2max (p>0.05). However, research shows that physical activity and screen time influence VO2max in adolescent students (p<0,05). Physical activity is related to Vo2max, while screen time has no relationship. However, screen time and physical activity simultaneously show a significant relationship. This study makes an important contribution to the understanding of the relationship between modern lifestyle and cardio-respiratory fitness.
Optimasi Performa Mesin Diesel Matsumoto MDX-178F melalui Modifikasi Intake dan Exhaust Setiawan, Dibyo; Jatnika, Rizal; Muthohhary, Derry Murtadho; Azmy, Ilham; Okviyanto, Toni; Wibowo, Cahyo
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 12, No 1 (2026): April
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v12i1.14945

Abstract

 The current condition of the Matsumoto MDX-178F diesel engine for the Energy Efficient Car Competition (KMHE) is not at its maximum performance, the efficiency and torque it produces have decreased from the initial engine specifications. The purpose of this activity is to recondition and modify the air intake and exhaust system on the Matsumoto MDX-178F diesel engine to optimize engine performance, increase combustion efficiency, and reduce exhaust emissions. The reconditioning method begins with an evaluation of the air intake and exhaust system which includes components such as air ducts, filters, exhaust ducts, head parts, pistons, cylinders, injectors and other parts. Repairs or replacements are carried out on components that are damaged or require readjustment. The modification process is carried out by porting and polishing the intake and exhaust lines. The increase in air flow is measured using a flow bench, the increase in power is measured using a dynotest, the reduction in exhaust emissions is measured using an exhaust gas analyzer. This study provides a scientific contribution through the integrated application of reconditioning and geometric optimization of intake–exhaust channels based on porting and polishing in a single-cylinder diesel engine within the context of energy-efficient vehicles, an area that remains limited in previous research. The results of this reconditioning and modification can show a significant increase in engine performance, including increased power and combustion efficiency. so that the engine becomes more environmentally friendly. The conclusion shows that the reconditioning and modification of the intake and exhaust systems of the Matsumoto MDX-170F diesel engine not only improves engine performance, but also improves fuel economy and reduces environmental impact.
Co-Authors Adri Maldi Subardjah Angkit Kinasih Apri Wiyono Ardi, Hanni Maksum Arif Budi Setiawan Arum Sekar Wulandari Astriana Baiti Sinaga Atok Subiakto Beatriksan, Yulianus Bintaran, Tubagus Syah Fatahillah Gelagah Wangi Budi Triyono Dadan Mulyana Danu Danu Dennys Christovel Dese Dewadi, Fathan Faisal Danu Tuheteru Fathan Mubina Dewadi Fauziah, Nadira Aribah Ferdiyansyah, Ferdiyansyah Handy, Rayhan Aliva Vitra Hulu, Alwin Praiman Ilham Azmy Insanistyo, Bayu Ipa Sari Kardi Ira Maisarah Irdika Mansur Iskandar Z. Siregar Jatnika, Rizal Jumari Kombong, Asarya Reno Kukuh Pambuka Putra KURNIASETIAWATI, ANNISA Maulana, Jon Mubina Dewadi, Fathan Muchamad Arif Al Ardha Muhammad Hasbi Muhammad Sigit Antoni Munir Fahmi, Mokhamad Muryanto Muryanto, Muryanto Muryanto, M Muthohhary, Derry Murtadho Noor Farikhah Haneda Nopiyanto, yahya eko Okviyanto, Toni Panalili T, Ojakma Sihar Pradibya, Aguch Vergianata Prijanto Pamoengkas Pujianto, Dian Purba, Dolok Putra, Fisika Prasetyo Rinaldi, Kardian Setiawan, Apri setiawan, Dibyo Siahaan, Herbert Hasudungan Sidi, Agam Allende Sri Wilarso Budi Sudarmanti, Rini Suhara, Ade Sukmawati, Dian Sunaryo, Sulistianto Susanti . Syamsudin Ahmad Slamet Telaumbanua, Observasi S. J Tingsapat, Suthana Tumanggor, Ojakma Sihar Panaili Widyaningtyas, Rut Wiwi Wildasari Yan Eka Prasetyawati