Senam ritmik adalah gerakan senam yang dilakukan dengan irama musik, atau latihan bebas yang dilakukan secara berirama, senam ritmik sangat erat hubunngannya dengan konsentrasi. Konsentrasi yang kurang baik akan menurunkan penampilan atlet, Latihan Relaksasi salah satu cara untuk meningkatkan konsentrasi, metode relaksasi pada hakikatnya merupakan penciptaan kondisi tubuh tanpa beban. Tujuan penelitian ini adalah untuk mengetahui apakah latihan relaksasi dapat meningkatkan konsentrasi atlet senam ritmik Sumut 2015. Penelitian ini bermanfaat untuk memberikan informasi tentang kondisi konsentrasi atlet senam ritmik sumut Tahun 2015.Penelitian dilakukan di jurusan Ilmu Keolahragaan Universitas Negeri Medan mulai pada bulan September 2015 sampai April 2016, dengan metode eksperimen, dengan pengambilan data pre test dan post test. Populasi dalam penelitian ini adalah berjumlah 7 orang dengan sampel penelitian berjumlah 7 orang yang ditetapkan adalah atlet senam ritmik Sumatera Utara .Hasil post test pada kategori Visual dengan rata-rata 0,265 dengan skor tertinggi 0,315 dan skor terendah 0,213. Hasil penelitian menunjukan bahwa Ada pengaruh peningkatan konsentrasi melalui latihan relaksasi atlet senam ritmik Sumut Tahun 2015 dengan nilai signifikansi 0.000 (< 0.025) dengan rata – rata nilai 0.26557. Kata Kunci : Senam Ritmik, Konsentrasi, Latihan Relaksasi
Energy sources for athletes based on their movement patterns come from aerobic and anaerobic metabolism which have the potential to produce lactic acid. The increase in lactic acid causes the pH to decrease so that ATP formation is disturbed and causes pain in the muscles. This situation can affect an athlete’s performance. The antioxidants contained in red dragon fruit can reduce free radicals due to exercise. The purpose of this study was to determine the effect of giving red dragon fruit on reducing levels of lactic acid in an athlete’s blood plasma The subjects were 20 persons, male, who were qualified as athletes, non-smokers and no consumption of supplement as long as the research. The subjects were split into two group, randomly. Group RE; had activity regular exercise and no red dragon fruit given. Group RE+RD; had activity regular exercise and obtained juice from red dragon fruit. The RDF team was given regular exercise and received red dragon fruit juice. Regular exercise combination antioxidant red dragon fruit antioxidants must maintain the anaerobic threshold value to prevent fatigue due to lactic acid.
The purpose of this research is to describe the vibration sensor media as a learning medium for sprint competitions for blind children and to assist teachers and students in learning using vibration sensor media. This research was conducted in several steps, namely: identifying potentials and problems, gathering information, product design, product manufacturing, expert validation, product revision, testing, final production. This vibration sensor media as a learning medium for sprint competitions was first validated by material experts and media experts. Product trials were carried out on blind children in DPD Pertuni Medan with a population of 6 respondents. The small group test was 2 respondents, while the large group test was 6 respondents. This type of data collection used a questionnaire instrument. The results showed that the vibration sensor that has been made for learning sprint competitions was feasible. These results were obtained from the validation results of a) material experts at 92.5% or very feasible; b) media expert of 86.66% or Very feasible; c) small group trial of 92.5% or very feasible; d) large group trial with a result of 95% or very feasible. The vibration sensor media has been declared fit to use as a learning media for vibration sensor media.
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