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The study purpose was to prove the effectiveness of a plyometric training program in increasing explosive power and agility in professional athletes of East Java. Materials and methods. This study is a pre-experiment with a research design of One Group Pretest-Posttest. A total of 15 male athletes from athletics and swimming at the Pusat Pendidikan dan Pelatihan Olahraga Pelajar (PPLP) East Java, Indonesia, aged 15–17 years, body mass index (BMI) 18.5–24.0 kg/m², normal blood pressure, normal resting heart rate, voluntarily participated in the study. The plyometric training program (hurdle-box jumps) was carried out for 30 minutes/training session with an intensity of 80-90% HRmax with a frequency of 3x/week for six weeks. Measuring the explosive power of the horizontal leg muscles used the Standing Broad Jump Test, while measurement of the explosive power of the vertical leg muscles used the Digital Jump Meter Test. Measurement of agility used Shuttle Run Test, and explosive power and agility were measured during pre-training and six weeks post-training. Data analysis used the Paired Sample T-Test with a significance level of 5% using the Statistical Package for Social Science (SPSS) version 21 software. Results. The results of the study showed that there was a significant difference in the average increase in explosive power horizontally, vertically, and agility between pre-training vs. post-training (p ≤ 0.001). Conclusions. In general, it can be concluded that the plyometric training program (hurdle-box jumps) carried out 3x/week for six weeks effectively increases the explosive power of the horizontal leg muscles, the explosive power of the vertical leg muscles, and increases agility.

The study purpose was to examine and analyze the effect of developing a hurdle-box jump plyometric model on muscle strength, explosive power, and hypertrophy. Materials and methods. This research was an experimental study with a two group pretest-posttest design. The sample in this study was male sub-elite athletes from various sports aged 15-17 years who were selected at random sampling totaling 22 athletes, divided into 2 (two) groups, the treatment group using plyometric hurdle-box jump development (n = 11) and the control group using plyometric barrier hops (n = 11). Results. The results showed that: (1) there was a significant effect of plyometric hurdle-box jump exercise on strength, leg muscle explosive power, and muscle hypertrophy, (2) there was a significant effect of plyometric barrier hops exercise (control group) on strength, leg muscles explosive power, and muscle hypertrophy, and (3) there was a significant difference between plyometric hurdle-box jump exercises and plyometric barrier hops exercises (control group) on strength, leg muscle explosive power, and muscle hypertrophy. Conclusions. The percentage increase in pretest and posttest scores on strength, leg muscle explosive power, and muscle hypertrophy showed that the hurdle-box jump plyometric exercise group was better than the control group (barrier hops).

Tujuan dari penelitian ini adalah untuk untuk mendeskripsikan tingkat kecemasan dan tingkat percaya diri atlet atletik menjelang perlombaan/pertandingan. Total sampling yang digunakan dalam penelitian ini sebesar 30 olahragawan cabang olahraga Atletik provinsi Jawa Timur. Jenis penelitian pada penelitian ini menggunakan analisis deskriptif dengan hasil keluar berupa persentase. Subjek penelitian ini adalah atlet cabang olahraga Atletik (lari, lompat, lempar). Pengumpulan data menggunakan kuesioner yang dikumpulkan secara online. Hasil analisis dibedakan menjadi dua faktor yaitu faktor dari dalam diri atlet (internal) serta faktor dari luar atlet (eksternal). Pada analisis aspek kecemasan (internal) diketahui berapa pada level rendah yaitu sebesar 27,8%, kemudian analisis aspek kecemasan (eksternal) berada pada level yang tinggi yaitu sebesar 72,2%. Sedangkan hasil dari analisis aspek percaya diri pada faktor internal adalah sebesar 76,94% atau masuk dalam kategori tinggi, selanjutnya analisis pada aspek percaya diri secara eksternal yaitu sebesar 23,06%. Kesimpulan dari penelitian ini adalah setiap atlet memiliki tingkat kecemasan yang berbeda-beda baik itu kecemasan yang timbul dari dalam diri sendiri ataupun kecemasan yang timbul akibat faktor lain diluar, untuk menghilangkan rasa cemas yang timbul atlet memiliki cara bagaimana untuk untuk memotivasi dirinya sendiri (intrinsik), selain itu faktor dari luar (ekstrinsik) baik itu dari lingkungan terdekat dan dukungan stakeholder yang terlibat juga akan menambah rasa percaya diri atlet sehingga dampaknya performa atlet yang sudah disiapkan pada saat latihan akan dapat ditampilkan pada saat pertandingan