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Hamstring Muscle Flexibility among KONI Volleyball Players of DKI Jakarta Province – A Pilot Study for Sport Injury Prevention. Hendriko; Tirza Z Tamin; I Nyoman Murdana; Aria Kekalih
Indonesian Journal of Physical Medicine & Rehabilitation Vol 2 No 01 (2013): Indonesian Journal Of Physical Medicine and Rehabilitation
Publisher : Indonesian Journal of Physical Medicine & Rehabilitation

Objectives: To find hamstring muscle flexibility among KONI Propinsi DKI Jakarta’s volleyball players,based on age, sex and playing position particularly.Methods: A cross sectional study performed in 25 female and 24 male athletes using Sit and Reach Test (SRT) box had done 3 times trial with the best score was recorded.Results: Hamstring muscle’s mean value score was 18.21 (SD 6.5) cm, male athletes was 17.6 (SD 6.5) cm, female athletes was 18.8 (SD 6.6) cm, middle adolescence 14-16 years old was 15.55 (SD 6.1) cm,late adolescence 17-20 years old was 19.91 (SD 6.9) cm, young adulthood 21-24 years old was 18.79 (SD 4.6) cm, hitter was 18.8 (SD 6.6) cm, center was 15.5 (SD 6.3) while allround players was 20.4 (SD5.9).Conclusions: Average value of hamstring flexibility among volleyball athletes of KONI DKI Jakarta based on SRT was 18.21 ± 6.5 cm, particularly within middle adolescence (14-16 years old) was 15.55± 6.1 cm, late adolescence (17-20 years old) was 19.91 ± 6.9 cm, and young adulthood (21-24 year old) was 18.79 ± 4.6 cm. While by sex was 17.6 ± 6.5 cm among male and 18.8 ± 6.6 cm among female.Based on playing position, hitters were 18.8 ± 6.6, setters were 15.5 ± 6.3 and all-round player were 20.4 ± 5.9 cm.Keywords: Flexibility, Hamstring muscle, SRT

Hamstring Muscle Flexibility among KONI Volleyball Players of DKI Jakarta Province – A Pilot Study for Sport Injury Prevention. Hendriko; Tirza Z Tamin; I Nyoman Murdana; Aria Kekalih
Indonesian Journal of Physical Medicine & Rehabilitation Vol 2 No 01 (2013): Indonesian Journal Of Physical Medicine and Rehabilitation
Publisher : Indonesian Journal of Physical Medicine & Rehabilitation

Objectives: To find hamstring muscle flexibility among KONI Propinsi DKI Jakarta’s volleyball players,based on age, sex and playing position particularly.Methods: A cross sectional study performed in 25 female and 24 male athletes using Sit and Reach Test (SRT) box had done 3 times trial with the best score was recorded.Results: Hamstring muscle’s mean value score was 18.21 (SD 6.5) cm, male athletes was 17.6 (SD 6.5) cm, female athletes was 18.8 (SD 6.6) cm, middle adolescence 14-16 years old was 15.55 (SD 6.1) cm,late adolescence 17-20 years old was 19.91 (SD 6.9) cm, young adulthood 21-24 years old was 18.79 (SD 4.6) cm, hitter was 18.8 (SD 6.6) cm, center was 15.5 (SD 6.3) while allround players was 20.4 (SD5.9).Conclusions: Average value of hamstring flexibility among volleyball athletes of KONI DKI Jakarta based on SRT was 18.21 ± 6.5 cm, particularly within middle adolescence (14-16 years old) was 15.55± 6.1 cm, late adolescence (17-20 years old) was 19.91 ± 6.9 cm, and young adulthood (21-24 year old) was 18.79 ± 4.6 cm. While by sex was 17.6 ± 6.5 cm among male and 18.8 ± 6.6 cm among female.Based on playing position, hitters were 18.8 ± 6.6, setters were 15.5 ± 6.3 and all-round player were 20.4 ± 5.9 cm.Keywords: Flexibility, Hamstring muscle, SRT

Rancang Bangun Mesin Pemeras Tebu 3 Roll dengan Penyajian Otomatis Jajang Jaenudin; Septika Ambarwati; Hendriko; Nur Khamdi
Jurnal Elektro dan Mesin Terapan Vol. 8 No. 1 (2022): Jurnal Elektro dan Mesin Terapan (ELEMENTER)
Publisher : Politeknik Caltex Riau

Sugarcane juice can be taken by squeezing sugarcane stalks using a squeeze machine. The existing squeezing machines are still not efficient and relatively low production speed. The main factor of machine performances was on rolls quantity and its arragement. To overcome this problem, we have designed and fabricated the machine with 3-rolls by optimally speed and inter-rolls distance setting. The squeezer rolls were driven by 1-phase motor with fixed speed by the gear ratio setting. The distance and position between the rolls are arranged in such a way that the pressing power is maximized, but it is maintained to avoid stuck. The peeled and cut sugarcane is loaded into the hopper. Then, the sugar cane is drawned and squeezed by rolls. After that, it filtered and stored in the container. This machine is equipped with an automatic system for dispensing sugarcane juice from the container to the glass. The results show that the efficiency of this machine is around 65.1% with 78.1 ml/s production speed. Sugarcane juice produced is relatively clean without contaminated by it dregs

Rancang Bangun Mesin Pengupas Buah Pinang Siahaan, Derryl Gabriello; Tianur; Edilla; Hendriko
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 5 No. 1 (2024): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v5i1.4276

Areca nut is classified as a grain that is widely distributed in several areas, especially Riau, especially in the Indragiri Hilir area as the largest betel nut producer in Indonesia. Peeling betel nut skin using a machine is easier and faster than manually peeling betel nut, based on that I am very interested in making a "Design of Areca Peeler". Furthermore, the betel nut peeler machine is planned to be able to accommodate areca nut with a capacity of 2.5 kg with a motor power of 3/4 HP. Based on the problems above, it is necessary to design a semi-mechanical dried betel nut peeler that can still be operated using human power. This betel nut peeler machine uses a blade that is placed horizontally and a slam net as a tool for stripping the betel nut method, which is inserted from the top hooper and then into the slamming net, then peeled by the slashing eye and the peeled betel nut comes out of the net that has been adjusted to the size of the betel nut. areca nut size and then down to the sloping part of the thin plate to separate the fruit and betel rind. In 3 experiments carried out from each load given the maximum dry betel nut stripping with a motor speed of 2793 RPM.

Sistem Kontrol Engraving Acrylic CNC 3 Axis Berbasis Pc Menggunakan Arduino pernandito, anderson _; Rahmawaty, Made; Tianur; Hendriko
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 5 No. 1 (2024): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v5i1.4287

CNC (Computer Numerical Control) machines have become an important part of various industries, including manufacturing and the arts. One of the important applications of CNC machines is engraving on acrylic materials, which are used to create high-quality detailed products. However, many 3-axis CNC machine control systems are expensive and complex, making them out of reach for many users. Therefore, this study aims to develop a more efficient and affordable 3-axis CNC acrylic engraving control system based on a PC using the Arduino. In previous studies, many studies have been carried out related to CNC machine control systems. Several studies have focused on developing PID control to improve the accuracy of CNC machine movements, while other studies have attempted to integrate the Arduino platform as the brain of a more effective control system. However, the research does not fully focus on the use of acrylic materials and does not provide integration with PCs as a user interface. The design of this system begins with selecting the right electronic components for the control system, including the Arduino as the main microcontroller, motor drive and the necessary sensors. In addition, the application's notebook-based user interface is designed to allow users to enter designs for direct engraving into the system. The use of PID control is optimized to ensure precise and precise CNC machine movement. This research produces a 3-axis acrylic CNC engraving machine control system on a PC using an Arduino. This system can control the movement of the CNC machine in three dimensions (X, Y and Z) with high precision. The application's user interface allows users to easily import designs for engraving. The final result data is the quality construction of the acrylic material, including the level of precision and detail engraved by the CNC machine.

Sistem Kontrol Suhu pada Pemasak Mesin Pembuat Sari Kedelai untuk Meningkatkan Produktivitas Sari Kedelai: Studi Kasus : UMKM Teknong Soya Bangkinang Pramestya, Anis; Rahmawaty, Made; Khamdi, Nur; Hendriko
Jurnal Elektronika dan Otomasi Industri Vol. 11 No. 1 (2024): Jurnal Elkolind Vol. 11 No.1 (Mei 2024)
Publisher : Program Studi Teknik Elektronika Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elkolind.v11i1.3506

UMKM Teknong Soya Bangkinang adalah produsen sari kedelai di Riau, yang membutuhkan produksi sebanyak 36 liter per hari. Saat ini, proses pemasakan sari kedelai masih terbatas, dilakukan secara tradisional, dan hanya menghasilkan 9 liter sari kedelai matang. UMKM ini belum mampu mengatur suhu dalam proses pemasakan sari kedelai. Hal ini dapat diatasi dengan sistem kontrol suhu pada pemasak sari kedelai. Sistem kontrol ini bertujuan meningkatkan produktivitas pemasakan sari kedelai. Sistem ini bekerja dengan mengontrol kompor secara otomatis dan mengatur nyala api selama proses pemasakan. Jika suhu mencapai 70˚C, nyala api akan berkurang untuk menjaga suhu agar tetap pada 80˚C hingga sari kedelai matang. Sensor suhu membaca peningkatan suhu setiap menit dan nilai suhu tersebut ditampilkan pada LCD. Hasil pengambilan data dari alat sistem kontrol suhu pada pemasak sari kedelai menunjukkan keberhasilan implementasi sistem kompor otomatis. Rata-rata waktu agar kompor menyala adalah 0,19 detik, dengan posisi katup saat proses pemasakan adalah 60˚ dan 65˚ untuk menghasilkan nyala api yang lebih kecil. Selain itu, pembacaan suhu juga akurat, mencapai 99,22%.

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