| Summary: | 碩士 === 臺北市立大學 === 運動器材科技研究所 === 107 === The purpose of this study was to investigate the correlation between accelerometers (ACC) and force plate signals, as well compare the determination of correlation among different squatting velocities and accelerometer placements. Eleven healthy young men were recruited. Two ACC were worn on participant’s lumbar and wrist of left hand. They were asked to hold hands the waist and stand on the force plate by both feet separated to shoulder-width. And then they execute half squat exercises randomly with seven cadences using metronome to control the downwards (D) and upwards (U) phases of squat. Those squat cadences were respectively referring as 1-second D and 1-second U, (1D1U), 1-second D and 2-second U (1D2U), 1-second D and 3-second U (1D3U), 2-second D and 1-second U (2D1U), 2-second D and 2-second U (2D2U), 3-second D and 1-second U (3D1U), and as fast as possible by individual subject (FAST). As above, each speed pattern made complete 15 repetitions and with 3-minutes rest between speeds. Pearson product-moment correlation coefficient (r) and coefficient of determination (R2) of acceleration and force signals during squat exercises were calculated and then analyzed the difference between varied squat cadences and accelerometer placements by utilizing two-way repeated ANOVA. Results: there were significantly high correlations between acceleration and force signals during different squat exercises (r = 0.86~0.96). There were significant main effects of different squat cadences and ACC placements on R2 without interaction effect. R2 of FAST was significant higher than 1D3U, 2D2U, 3D1U, and R2 of 2U2D was significant lower than the other squat cadences, moreover, R2 of 1D3U was significant lower than 1D1U, 1D2U, 2D1U. In addition, R2 on waist site was higher than on wrist joint. Conclusion: ACC is a valid tool to assessing squat exercise. It is more suitable for faster squat speed and better prediction on waist site.
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