Introduction: Because of the fact that detailed data on the physiological characteristics of Pencak Silat are still limited. The primary purpose of this study to assess the physiological responses of Pencak Silat athletes and a secondary aim is to compare the physiological responses of Pencak Silat athletes with physiological responses of Taekwondo athletes. Material and Methods: This study has included 17 male junior martial art athletes (aged 15–16 years). This study requires all participants to completed one familiarization session and two experimental sessions. During the first session (laboratory condition), anthropometry was measured in the laboratory, and during the second session (on-court condition), the participants completed tests for anaerobic capacity (sprint test 60-m, vertical jump, push-ups, and sit-ups) and VO2max test. Results: The statistical analysis revealed no significant differences in anthropometry, vertical-jump, sit-ups, push-ups, and 60-m sprint results among TKD and PKS groups. Furthermore, the TKD group had significantly higher VO2max (p=0.015), when compared with the PKS group. Conclusion: The present investigation describes similar physiological characterizes, such as weight, height, BMI, BMR, body fat and also performances of vertical jump, sit-ups, push-ups, and 60-m sprint tests among Taekwondo and Pencak Silat athletes. However, in comparison with junior Pencak Silat athletes, the junior Taekwondo athletes have better VO2max.

The measurement of physiological characteristics of junior athletes is important to do as the first step in determining and designing training designs that are appropriate for athletes. The purpose of this study was to measure the physiological characteristics of Indonesian Junior Taekwondo athletes, who were members of student training education centres (PPLP), in West Java, Central Java, and East Java provinces. This qualitative descriptive study conducted the process of collecting data of 8 male junior Taekwondo athletes and 9 female Taekwondo junior athletes. The results of the obtained data were compared with the data from previous research as a reference in determining the quality standards of Indonesia junior Taekwondo athletes compared with Taekwondo junior athletes from other countries. Related to anthropometric aspects, the results of this study showed that the body weight, height, and BMI of Taekwondo athletes were in the normal category according to WHO standard. Based on the results of anaerobic capacity measurement, Taekwondo athletes got unfavourable results on an average 30 meter sprint result. However, the results of vertical jumps and VO2max indicated that Indonesian junior Taekwondo athletes were above the normal category determined previously. This research successfully described the physiological characteristics of Indonesian junior Taekwondo athletes in West Java, East Java, and Central Java student training education centres. The trainers are encouraged to provide a balance concept of aerobic and anaerobic trainings in order to create or to nurture Taekwondo athletes properly and appropriately.

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Athlete Speed and acceleration data needed for customizing the athlete training program design. This study is conducted to identify and compare the speed and acceleration of ability between woman Soccer and futsal athlete. The samples used in this study are women soccer and futsal players from Soccer and futsal club, age ranging from 16-17 years old. The athlete performs 60 meters running test, every 10 meters will be recorded the time. Results, Average time 60m running test of women soccer 11.16s and women futsal 10.50s, not significant difference with(p>0.05). The average speed of women soccer 5.71m/s and women futsal 5.94 m/s, not significant difference with(p>0.05). Average acceleration of women soccer 0.58m/s2 and women futsal 0.61m/s2, not significant difference with(p>0.05). Then, a significant difference in speed and acceleration at each 10, 20, 40, 50, 60 meter between woman Soccer and futsal athlete with (p<0.01). But, there is no significant difference at 30 meters with a value (p>0.01). The results show there are no significant differences in the time, speed, and acceleration in 60m running test between women soccer and futsal athlete. But, there is significant deferent in a change of speed and acceleration per/10 meter. The women futsal players have speed and acceleration higher than football players.

Saat ini sedang berkembang pencatatan waktu otomatis yang dijual oleh beberapa perusahan perlatan olahraga ternama seperti. Namun sayangnya, harga perangkat tersebut sangatlah mahal, dan membuat setiap pelatih ataupun praktisi olahraga terkendala untuk mendapatkannya. Karena fakta dan permasalahan tersebut, maka penelitian ini bertujuan untuk mengembangkan prototipe sistem pencatatan waktu untuk pengukuran kecepatan secara otomatis pada sprint 60-meter, dengan menggunakan perangkat sederhana dengan harga yang murah, namun memiliki tingkat presisi dan akurasi yang baik. Penelitian ini menggunakan metode penelitian research and development, dimana dalam proses pengembangan dan pembuatan pencatatan waktu otomatis, penelitian ini mengambil contoh dari timing gate yang sudah divalidasi sebelumnya. Dalam penelitian ini, kami juga sudah melakukan uji coba kepada 12 atlet sprinter (tinggi badan 172.8 ± 9.31, berat badan 61.05 ± 6.90, BMI 20.38 ± 0.87) terkait kegunaan alat tersebut. Rata-rata kecepatan lari seluruh subjek pada pos 10-meter adalah 2.44 ± 0.23 detik, pos 20-meter adalah 3.71 ± 0.18 detik, pos 30-meter adalah 4.75 ± 0.22 detik, pos 40-meter adalah 6.39 ± 0.31 detik, 50-meter adalah 7.65 ± 0.41 detik, dan 60-meter adalah 9.12 ± 0.49 detik. Penelitian research and development terkait pengembangan pencatatan waktu otomatis dalam penelitian ini, menunjukkan bahwa pencatatan waktu otomatis dapat dibuat dengan harga ekonomis, dan dapat digunakan untuk mengukur kecepatan lari 60-meter. Development of track timer prototype system for automatic speed measurement on 60-meter sprints AbstractCurrently, automatic track timers are being sold by several well-known sports equipment companies. Unfortunately, the price of the device is very expensive and makes every coach or practitioner constrained to get it. Because of these facts and problems, this research was aimed to develop a prototype track timer system for automatic speed measurement on a 60-meter sprint, using a simple device at a low price, but has a good level of precision and accuracy. This study used to research and development research methods, wherein the process of developing and manufacturing automatic track timers, this study takes the example of a timing gate that has been validated before. In this study, we have also tested 12 sprinters (height 172.8 ± 9.31, weight 61.05 ± 6.90, BMI 20.38 ± 0.87) related to the use of the tools. The average running speed of all subjects on a 10-meter post is 2.44 ± 0.23 seconds, a 20-meter post is 3.71 ± 0.18 seconds, a 30-meter post is 4.75 ± 0.22 seconds, a 40-meter post is 6.39 ± 0.31 seconds, 50- The meter is 7.65 ± 0.41 seconds, and the 60-meter is 9.12 ± 0.49 seconds. This research shows that track timers can be made at economical prices, and can be used to measure 60-meter running speed.

Tilting Train Dynamic Modeling and Simulation on Jakarta – Bandung Railway : Train is a mode of mass transportation that connects Jakarta to Bandung or vice versa with a travel time of three and a half hours. If trains pass many curves on the railway, they need to reduce their speed to avoid excessive lateral acceleration. In the curves, cant is given to overcome this, but its magnitude is limited by the regulations. Tilting train can be a solution to overcome the limitation by tilting the carbody. In this research, tilting train is modeled using Universal Mechanism software. The tilting system is modeled by an actuator as a joint which its length is a function of time. The model is validated by comparing the value of the analytical parameter based on the theory with the value of the simulation results. Furthermore, the dynamic simulations using the validated model is carried out to test the tilting system in several curve geometry scenarios. Based on the simulation results, the tilting system works well in reducing the carbody lateral acceleration, but is not optimal because it is not equipped yet with a control system. The plan to increase the speed of the train on the Jakarta – Bandung railway to reduce travel time was prepared analytically and tested by the simulations for several curves. Ignoring track irregularities, the tilting train is planned to operate with an average speed of 112 km/h so that the Jakarta – Bandung railway can be reached in less than two hours.Keywords: Tilting Train, Speed, Lateral Acceleration, The Jakarta – Bandung Railway.ABSTRAKKereta api menjadi moda transportasi massal yang menghubungkan pergerakan masyarakat dari Jakarta menuju Bandung ataupun sebaliknya dengan waktu tempuh selama tiga setengah jam. Dengan jalan rel yang memiliki banyak tikungan, kereta perlu mengurangi kecepatannya supaya tidak mengalami percepatan lateral yang sangat besar. Pada tikungan diberi cant untuk mengatasi hal tersebut, namun besarnya dibatasi oleh regulasi. Kereta tilting dapat menjadi solusi untuk mengatasi keterbatasan tersebut dengan cara memiringkan badan kereta ketika melewati tikungan. Pada penelitian ini, kereta tilting dimodelkan menggunakan perangkat lunak Universal Mechanism. Sistem tilting dimodelkan melalui aktuator tilting sebagai sambungan yang panjangnya merupakan fungsi terhadap waktu. Model divalidasi dengan membandingkan nilai analitik parameter berdasar teori dengan nilai hasil simulasi. Selanjutnya simulasi dinamik dengan menggunakan model yang telah divalidasi dilakukan untuk menguji sistem tilting pada beberapa skenario geometri tikungan. Berdasarkan hasil simulasi sistem tilting bekerja dengan baik dalam mengurangi percepatan lateral badan kereta, namun belum optimal karena belum dilengkapi dengan sistem kontrol. Rencana peningkatan kecepatan kereta di lintas KA Jakarta – Bandung untuk memangkas waktu tempuh disusun secara analitik dan diuji dengan simulasi untuk beberapa tikungan. Dengan mengabaikan ketidakteraturan rel, kereta tilting direncanakan dapat beroperasi dengan kecepatan rata-rata 112 km/jam sehingga lintas KA Jakarta – Bandung dapat ditempuh selama kurang dari dua jam.Kata Kunci: Kereta Tilting, Kecepatan, Percepatan Lateral, Lintas KA Jakarta – Bandung

Kebiasaan untuk beraktivitas fisik sejak dini berperan penting dalam membangun gaya hidup yang sehat serta derajat kebugaran di kemudian hari. Riset ini berupaya untuk mengetahui sebarapa besar tingkat aktivitas fisik siswa SMA di Jawa Barat, yang pada akhirnya dijadikan acuan dan tolak ukur dalam pembuatan kebijakan dilingkungan olahraga. Metode yang digunakan dalam penelitian ini merupana random sampling, tersebar di 5 kota/kab yang ada di Jawa Barat. Metode penelitian ini menggunakan metode penelitian deskriptif kuantitatif. Data tingkat aktivitas fisik didapatkan dari kuesnioner IPAQ (International Physical Activity Questionnaire). Hasil dari kuesioner tersebut rata-rata tingkat aktivitas fisik dalam kategori tinggi, dengan nilai metabolic equivalent (METs) 3520.2 (±2774.3). Paling tinggi tingkat aktivitas fisik di Kota Tasikmalaya, sedangkan paling rendah ada di Kabupaten Kuningan. Namun dari kelima kota tersebut tidak ada perbedaan yang signifikan. Kesimpulannya kategori tingkat aktivitas fisik siswa SMA Jawa Barat tinggi, namun ada beberapa catatan karena mereka memiliki durasi duduk yang cukup tinggi serta kebiasaan bermain permainan daring yang terlalu sering.

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