The Study Of Kayak Ergometers Performance Between Stable And Variable Resistance

• Main Authors: Lo,Pinhsin, 羅丙炘
• Other Authors: Ho, Wei Hua
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/89998684550836898019

碩士 === 臺北市立體育學院 === 運動器材科技研究所 === 100 === The purpose of this study were to discuss what differences stable and variable resistance set on the kayak ergometer will make to the stroking impulse. The subjects of this research are 30 students from the kayak team in Taipei Physical Education College, Taipei Municipal Yucheng Senior High School, and Taipei Municipal Nan Gang High School. Each of them is required to take Test A and Test B on the same kayak ergometer, the former (mock competition) a resistance-variable test and the latter a resistance-stable test. In the beginning, the maximal strength with which each subject paddles is measured through the control software National Instruments LabVIEW in the computer connected to the new magnet-control kayak ergometer (the resistance intensity is measured from 0 to 250, and 0 indicates the maximal resistance intensity, and 250 the smallest). After that, each subject will take a break until their energy is fully recovered before beginning to take Test A, in which the paddling frequency is 80 times per minute, and there are 8 stages with every 15 seconds per stage (120 seconds in total) ---0-15 seconds, 15-30 seconds, 30-45 seconds, 45-60 seconds, 60-75 seconds, 75-90 seconds, 90-105 seconds, and 105-120 seconds. Resistance intensity begins to decrease from the 60% of the maximal resistance intensity, and increase to 75% of the maximal resistance intensity at the last 15 seconds. Resistance intensity at each of the eight stages is respectively set at 60%, 60%, 55%, 50%, 55%, 60%, 65%, and 75% of the maximal resistance intensity. After fully recovered, each subject begins to take Test B, in which the paddling frequency remains 80 times per minute, and the duration is 120 seconds, but the resistance intensity remains60% of the maximal resistance intensity all the time. Test A and Test B take 120 seconds respectively, and the total amount of resistance intensity on both Test A and Test B is the same. The results of the experiment is are as follows: in the two-minute test which mocks 500-meter paddling competition, the average paddling impulse of variable resistance is 404.5 kgf per second, and its standard deviation is 119.23 kgf per second. On the other hand, the average paddling impulse of stable resistance is 388.76 kgf per second, and its standard deviation is 112.70 kgf per second. The measured magnitude of each test is less than 0.05 (p＜ .05). As the average of variable resistance minus that of stable resistance and then divided by that of stable resistance, we get 4.05%. The paddling impulse of variable resistance is higher that that of stable resistance. If the paddling time is divided into eight stages, we can find that at stage 3, 4, 5, and 6, the paddling impulse of variable resistance is lower than that of stable resistance. But from stage 7 to stage 8, the paddling impulse of variable resistance is apparently far higher than that of stable resistance. We thus can see the differences in paddling impulse between these two resistance tests.