An athlete’s performance is partly determined by his or hers ability to exert force in order toachieve a desired movement and velocity. By increasing force output during a specific timeframe, while mass is constant, will in turn increase the so called rate of force developmentand potentially improve speed. Isokinetic training is designed to increase force productionthrough the full range of motion in an exercise but has traditionally been done in a singlejointdevice limiting its applicability to sports. To date there is little research done on theeffects of isokinetic training used in more sport specific movements to improve on iceperformance parameters. PURPOSE: The aim of the present study was to investigate theeffects of 8 weeks of two different training protocols volume matched for concentric loadingincluding; (1) isokinetic squats versus (2) isoinertial squats on strength, power, speed (on andoff-ice) and agility on ice in young male ice hockey players. METHOD: 15 ice hockey playersfrom division 1 in the Swedish junior hockey league were included in this study. They werestratified by 1RM strength test values into either the isokinetic (IKT) or the isoinertialtraining group (TRT) in order to control for equal total volume. The training was done for 8-weeks with 2-3 sessions each week consisting of 4 different squat exercise variations. Testsfor strength (1RM squat), power under heavy load (loaded squat jumps) and power underlight load (unloaded jump variations), speed (30 m sprint on and off ice) and agility(Cornering S test on ice) were conducted pre-and post intervention. A 2 between(treatment) x 2 within (time) analysis of variance (ANOVA) was performed to detect anymain effects or interactions. RESULTS: Significant main effects for time were found for squat1RM (p ˂0.01) loaded vertical jumps for 20 kg (p 0.01), 40 kg (p ˂0.01), 60 kg (p ˂0.01), 80 kg(p ˂0.01), sprint 30 m on ice (p ˂0.01) and sprint 30 m off ice (p= 0.01). There were nostatistical significant differences between the two groups for any of the measuredperformance variables. CONCLUSION: Although a training effect was present in mostvariables measured, isokinetic training had no greater effect on strength, power, speed oragility variables among adolescent ice hockey players than traditional isoinertial barbelltraining after 8 weeks lower body of resistance training. Further research is needed toelucidate both the effects of isokinetics training on power and strength but also on icehockey performance parameters.