A Correlation Study of Electromyography Threshold, Heart Rate Variability Threshold, Ventilation Threshold and 3000m Performance

• Main Author: 林子揚
• Other Authors: 蔡忠昌
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/26026574007956980405

碩士 === 國立彰化師範大學 === 運動健康研究所 === 98 === Abstract This study aimed to discern the difference of electromyography threshold (EMGT), heart rate variability threshold (HRVT) and ventilation threshold (VT) during graded exercise. In addition, correlation of the three determined thresholds and performance of 3000m and 20m shuttle run test were also examined. 13 healthy college males were recruited to join the experiments. At first, they completed the healthy condition form, consent, and body composition assessment by a bio-impedance analyzer. Later, they were subjected to perform a graded exercise on cycle, started at 50watts (W), increased 25W per minute, and terminated when pedaling rate below 60 rpm. The EMG signal of right thigh, intervals of heart rate, and gas analysis were simultaneously recorded during the test. They executed a 20m shuttle run test and a 3000m run test on separate day, respectively, for evaluating personal aerobic capacity. The data were analyzed by pair t-test and Pearson product-moment correlation coefficient analysis with SPSS 12.0. The level of significance was set at p < 0.05. The results showed that EMGT and HRVT were highly correlated with VT2 (R＝0.771, P < 0.05; R＝0.829, P < 0.05). Power at EMGT and HRVT were significantly correlated to the performance of the 20m shuttle run test, with R＝0.782, 0.658, respectively. Power at EMGT and HRVT are also significantly correlated with the 3000m performance with R＝-0.555, -0.701, respectively. According to the results, the EMGT and HRVT could be convenient and appropriate methods for assessing aerobic-anaerobic transition and are helpful for athletes and coaches to determine the anaerobic threshold for manipulating personal training protocol.