Abstract
Ability to perform rapid open-kinetic chain movements (e.g. kicking, throwing, hitting, or punching) is an important prerequisite for success in various sports. The aims of the present study were (1) to investigate the effect of elastic resistance training (ERT) on the performance of jab punch, (2) to explore the associated changes in movement kinematic and kinetic patterns, and (3) to assess possible differences among competitors of different specializations. The national level junior competitors in kick boxing, savate, and boxing practiced jab punch against elastic resistance for 15 minutes per day, 3 times a week for 6 weeks, while the control group participated only in their regular training (N=10+10+10+10; age 17.2±1.0 years; M±SD). The results revealed a marked increase in the maximum jab punch velocity in all experimental groups (6-11%; all p<.01), but not in the control group (p>.05). This finding was associated with an increase in both the maximum velocity and displacement of the ipsilateral elbow, shoulder, and, particularly, hip joint, while no change in the movement time was observed. The ERT-associated increase was also revealed in the agonist (7-11%, all p<.01), but not antagonist muscle strength. Therefore, we conclude that addition of a relatively small amount of ERT could be recommended for the purpose of improving punching performance and, possibly, other rapid limb movement even in top-level junior athletes. The observed performance improvement could be partly based on increased motion amplitudes particularly regarding the pelvis movement, as well as on increased strength of agonist muscles
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