The shoulder joint is the weakest link in the kinetic chain of weightlifting. The purpose of this study was to compare the effects of additional isokinetic versus isotonic training of shoulder joint and its cessation on two dimensional kinematics and barbell velocity during one repetitive maximum of power clean and power snatch among advanced level of adolescent weightlifters. Nineteen weightlifters were divided into either isokinetic or isotonic group. All weightlifters were recruited from the same pool of advanced level of weightlifters who went through mandatory training provided by their coach. The training described in this study was an additional training to their mandatory training. The barbell velocities during second pull and turnover phases were compared before, after and one month after the cessation of additional training program. A trend of positive improvement of one repetitive maximum of power clean and power snatch were observed following both types of training programs. Both types of training showed a trend of increased barbell velocity during second pull phase in both one repetitive maximum power snatch and power clean. Both types training showed a trend of decreased barbell velocity during turnover phase in one repetitive maximum power snatch but not in one repetitive maximum power clean. Both types of training on shoulder joint may provide potential benefit to improve power clean and power snatch performance.
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