| Summary: | 碩士 === 高雄醫學大學 === 運動醫學系碩士在職專班 === 103 === Currently, researches on bare foot running shoes were discussing mostly on basic biomechanics of human body. Knee valgus and varus, rear foot inversion and eversion were used to discuss the pros and cons of bare foot running shoes. However, the tension changes in the lower extremity muscles and local muscle activation in daily running have not been clarified. Comparing with running motion wearing normal running shoes, bare foot running shoes results in more forefoot strike (FFS). The muscles used in forefoot strike running are extremely different comparing with heel strike running in normal running shoes. Previous studies have shown that heel strike running would contribute to more ground reaction force and result in rear foot eversion, increasing the risk of 2nd and 3rd metatarsals fracture. For these two running shoes, the local muscle activation and muscle tension and elasticity of the runner have not been studied. Therefore, this study intend to investigate the differences of muscle activation and tension after running with normal and bare foot running shoes.
12 subjects with a habit of running were recruited and undergone a 30-minute running test. Delsys Trigno wireless electromyography system, Myoton muscle fatigue measuring system and Casio high speed cameras were utilized to measure the changes of muscles and running method before, during and after the 30-minute running test. In the results, the landing of bare foot running changed from rear foot to middle foot. From the Myoton muscle fatigue measuring system we found out that after running, the muscle tension of rectus femoris and tibialis anterior
decreased and muscle stiffness decreased in barefoot shoe runners. For normal runners, the muscle tension of rectus femoris and tibialis anterior also decreased and the elasticity of biceps femoris and peroneus longus enhanced.
For muscle activations, significant correlation in time was found in the maximum activation of rectus femoris, biceps femoris and soleus. We could see that during the period of transiting from rear foot to middle foot landing in bare foot runners, in order to reduce the ground reaction force, through different levels of muscle activation and tension changes of rectus femoris, biceps femoris and soleus they were able to continue the landing pattern.
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