[ABSTRAK
Penelitian ini bertujuan untuk mengetahui efektivitas latihan Nordic hamstring sebagailatihan tambahan dalam upaya perbaikan faktor risiko cedera otot hamstring pemain futsal.Total pemain futsal (usia 18-21 tahun) berpartisipasi pada penelitian ini, 15 pemain padakelompok kontrol dan 16 pemain pada kelompok perlakuan. Kelompok perlakuan melakukanlatihan rutin ditambahkan latihan Nordic hamstring selama 4 minggu (protokol 4 minggu)dan kelompok kontrol melakukan latihan rutin. Pengukuran kekuatan otot hamstring danquadriseps dilakukan sebelum dan setelah perlakuan pada kedua kelompok dengan memakaialat isotonik dinamometer. Perubahan hasil pengukuran dalam setiap kelompok sebelum dansetelah perlakuan diolah menggunakan uji-t berpasangan (p < 0,05).Hasil penelitian menunjukkan pada kelompok perlakuan mengalami peningkatan kekuatanotot hamstring (p = 0,029 pada tungkai kanan dan p = 0,007 pada tungkai kiri), terdapatperbaikan keseimbangan kekuatan otot hamstring kanan dan kiri (p = 0,016), namun tidakada perbaikan rasio kekuatan otot hamstring terhadap quadriseps . Pada kelompok kontrol,tidak terdapat peningkatan kekuatan otot hamstring, tidak ada perbaikan keseimbangan dantidak ada perbaikan rasio kekuatan otot hamstring terhadap quadriseps. Hasil penelitian inimenunjukkan bahwa latihan Nordic hamstring protokol 4 minggu adalah sebuah programlatihan yang efektif untuk memperbaiki faktor risiko cedera yang berperan dalam upayapencegahan cedera otot hamstring.

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ABSTRACT
This research is to establish to know the Nordic hamstring exercise effectiveness as adjuvantexercise to improve injury risk factor on futsal players hamstring muscle. College studentfutsal players (age ranges 18 ? 21 year old) as participant in this research consist of 15players as control group and 16 players as treated one. Treated one conducts routine exerciseand Nordic hamstring exercise for 4 weeks (4 weeks protocol) and control group conductsroutine exercise. Measurement of hamstring and quadriceps muscles strength are measuredbefore and after treatment on both group by using isotonic dynamometer device. Thedifference of the results in both group before and after treatment are managed by usingpaired-t test (p < 0,05).The results shows that treated group improve their hamstring muscle strength (p = 0,029 onright legs and p = 0,007 on the left ones), improve the balance of their left and righthamstring strength (p = 0,016), but there is no improvement on hamstring and quadricepsmuscles strength ratio. On control group, theres is no hamstring muscle strengthimprovement, no balance improvement, and no improvement on hamstring and quadricepsmuscles strength ratio. The result shows that 4 weeks protocol Nordic hamstring exercise is aeffective programme to improve injury risk factor that has a role in preventing hamstringmuscle injury., This research is to establish to know the Nordic hamstring exercise effectiveness as adjuvantexercise to improve injury risk factor on futsal players’ hamstring muscle. College studentfutsal players (age ranges 18 – 21 year old) as participant in this research consist of 15players as control group and 16 players as treated one. Treated one conducts routine exerciseand Nordic hamstring exercise for 4 weeks (4 weeks protocol) and control group conductsroutine exercise. Measurement of hamstring and quadriceps muscles strength are measuredbefore and after treatment on both group by using isotonic dynamometer device. Thedifference of the results in both group before and after treatment are managed by usingpaired-t test (p < 0,05).The results shows that treated group improve their hamstring muscle strength (p = 0,029 onright legs and p = 0,007 on the left ones), improve the balance of their left and righthamstring strength (p = 0,016), but there is no improvement on hamstring and quadricepsmuscles strength ratio. On control group, theres is no hamstring muscle strengthimprovement, no balance improvement, and no improvement on hamstring and quadricepsmuscles strength ratio. The result shows that 4 weeks protocol Nordic hamstring exercise is aeffective programme to improve injury risk factor that has a role in preventing hamstringmuscle injury.]