| Summary: | 碩士 === 國立臺灣師範大學 === 運動科學研究所 === 99 === To control the range of motion (ROM) of knee joint is the key factor during leg strength training. It is very important to maintain a proper ROM and stance during the resistance training exercise to prevent injuries. Song and Liu (2010) found that providing augmented visual feedback (knee angle) could improve better control of ”knee angle” and more stable performance of “knee distance” during leg press exercise. However, the main purpose of resistance training is improving the muscle power. Purpose: To Investigate the effect of augmented visual feedback on the improvement of muscle power from the leg press training. Methods: Nineteen healthy college males without any lower body strength training experiences volunteered in the experiment. Before and after the 15 sessions of strength training, all participants were tested for one repetition maximum strength (1RM). Three sets of leg press were paced at 40 bpm for 8 flexions and extensions. A 2-axial electronic goniometer was attached to the lateral of the left knee joint to measure the angle of knee during the movement. A camera was place on the top of subjects to record change of knee distances. The angular display unit was connected to the goniometer which provided the angular displacement of the knee movement as the augmented visual feedback. Data were analyzed with one-way ancova, All statistical analysis were completed with SPSS17.0. Results: The augmented visual feedback group was more accurate at the 90-degree position than without augmented visual feedback group, F (1.17) = 4.960, p < .05, and the muscle power also showed significant difference between groups, F (1.17) = 5.930, p < .05. Conclusion: The augmented visual feedback could facilitate the control of the angular displacement of the knees leg press exercise and enhance the muscle power improvement.
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