innovation of a New Resistance Device for throwing skills and Zuki Skill in Karate

One of the principles of training is specificity of training. Especially during competition season، because of probability of interruption in rhythms of movements and skills in sport activities using of resistance training programs with normal device in clubs can be not useful for improvement of the speed and the power of appropriate muscles. We are paying attention on how to apply resistance training program in sport skills especially in throwing skills like shot put in track and field and punch technique in martial arts without any decrease in quality of our technique. For instance، normal resistance training such as training with weight devices، because of incorrect time sequence of muscle contractions can affect to wrong technique. Then considering type of muscle contraction، rhythms، speed، rang of motion in training programs especially in competition season is a good way to improve performance and decrease of time for preparation program. Advantages of this new device are summarized as follow: 1- It follows movement pattern it has a relation with throwing skills، 2-It can use of specific muscles with specific contraction in related with throwing skills، 3- Releasing of weight from hand after doing performance like shot put or other throwing tools، 4- Increase of load on muscles during force producing phase. For determine of validity we selected 15 elementary Karatekas. We divided them in experimental (n= 8) and control (n= 7) groups. Every group began karate training for 6 weeks with 3 session for every week. Every session included warm-up (20 min)، technique learning (20 min)، conditioning (15 min) and 10 min cool-down. Conditioning training was 5 sets of 10 repetitions work with machine for experimental group and push up with same volume and intensity (Borg scale) for control group. Pre and post test data collected from power of upper limbs (distance of throwing of 3 kg shot put). Both groups had a significance increase after 6 weeks training program (Exp: p=0. 001، Con: 0. 001) but experimental group had significance increase than control group (p=0. 034). This device is a simple brake machine and sinuses motion of one lever that can produce variable forces and change the liner motion of hand to angular motion in brake system. We hope that using of this machine will be useful for shot put athletics to increase their records and decrease of period of preparation time. As this device is a first approach in this area، thus more research could be conducted in the future.