PENGARUH KOMBINASI LATIHAN PLYOMETRIC HURDLE  JUMP DAN JUMP BOX TERHADAP PENINGKATAN  VERTICAL JUMP PADA ATLET BOLA VOLI

THE EFFECT OF A COMBINATION OF PLYOMETRIC  HURDLE JUMP AND JUMP BOX TRAINING ON  INCREASING VERTICAL JUMP IN VOLLEYBALL ATHLETES

Kemampuan vertical jump merupakan salah satu komponen kondisi fisik yang sangat krusial dalam permainan bola voli karena berperan langsung dalam menunjang efektivitas 

berbagai teknik dasar seperti spike, block, dan jump serve. Kemampuan ini berkaitan erat dengan daya ledak (power) otot tungkai, yaitu kemampuan otot untuk menghasilkan kekuatan maksimal dalam waktu yang sangat singkat. Oleh karena itu. pengembangan vertical jump memerlukan metode latihan yang spesifik. sistematis.. dan berbasis prinsip ilmiah. salah satunyamelalui latihan plyometric yang menekankan siklus regang pendek(stretch shortening cycle) untuk meningkatkan efisiensi kontraksiotot. Penelitian ini bertujuan untuk menganalisis secara empiris pengaruh kombinasi latihan plyometric hurdle jump dan jump boxterhadap peningkatan kemampuan vertical jump pada atlet bola voli remaja. Penelitian menggunakan pendekatan kuantitatif dengan desain pra eksperimen one group pre test post test. yang melibatkan atlet klub AVONG usia 13 15 tahun dengan teknik purposive sampling berdasarkan kriteria tertentu. Program latihan dilaksanakan selama enam minggu dengan frekuensi tiga 

kali per minggu. disesuaikan dengan prinsip overload. progresivitas. dan spesifisitas latihan. Pengukuran kemampuan vertical jump dilakukan sebelum (pre test) dan sesudah (post test) perlakuan menggunakan instrumen tes yang terstandar. kemudian dianalisis menggunakan Wilcoxon Signed Rank Testkarena data tidak berdistribusi normal. Hasil analisis menunjukkan adanya peningkatan yang signifikan dengan nilai Asymp. Sig. (2 tailed) Lebih besar dari 0.001. yang berarti terdapat perbedaan bermakna antara sebelum dan sesudah perlakuan. Secara fisiologis, peningkatan ini menunjukkan adanya adaptasi 

neuromuskular berupa peningkatan koordinasi intramuskular dan intermuskular, serta peningkatan kemampuan rekrutmen serabut otot cepat (fast twitch fibers) yang berkontribusi terhadap peningkatan power otot tungkai. Dengan demikian, kombinasi latihan plyometric hurdle jump dan jump box terbukti efektif dalam meningkatkan kemampuan vertical jump atlet bola voli remaja. Temuan ini memberikan implikasi praktis bagi pelatih dan praktisi olahraga sebagai dasar dalam menyusun program latihan yang lebih terarah, efektif, dan berbasis bukti ilmiah guna 

meningkatkan performa atlet secara optimal.Kata kunci  plyometric. hurdle jump. jump box. vertical jump. bola voli

Vertical jump ability is a critical component of physical fitness in volleyball. as it directly supports the execution of fundamental techniques such as spikes. blocks. and jump serves. This ability is closely related to lower limb explosive power, defined as the capacity of muscles to generate maximal force in a very short period of time. Therefore, improving vertical jump performance requires specific. systematic. and scientifically grounded training methods. one of which is plyometric training that emphasizes the stretch. shortening cycle to enhance muscular contraction efficiency. This study aims to empirically analyze the effect of a combination of plyometric hurdle jump and jump box exercises on improving vertical jump ability in adolescent volleyball athletes. The study employed a quantitative approach with a pre experimental one group pre test post test design. involving AVONG club athletes aged 13 15 years selected through purposive sampling based on specific criteria. The training program was conducted over six weeks with a frequency of three sessions per week. adhering to the principles of overload. progression. and specificity. Vertical jump performance was measured before (pre test) and after (post test) the intervention using standardized testing instruments. and the data were analyzed using the Wilcoxon Signed Rank Test due to non normal data distribution. The results revealed a statistically significant improvement. with an Asymp. Sig. (2 tailed) value of biger than 0.001. indicating a meaningful difference between pre test and post test results. Physiologically. this improvement reflects neuromuscular adaptations. including enhanced intra and intermuscular coordination as well as more efficient recruitment of fast twitch muscle fibers. which are essential for generating explosive power. In conclusion, the combination of plyometric hurdle jump and jump box exercises is proven to be effective in enhancing the vertical jump ability of adolescent volleyball athletes. These findings provide practical implications for coaches and sports practitioners in designing more effective. structured. and evidence based training programs to optimize athletic performance.

Keywords:plyometric. hurdle jump. jump box. vertical jump. volleyball