A Survey Of 20 - Meter Male Students' Run - Up And 1000 - Meter Race

Research purpose:Cardiorespiratory Endurance is an integral part of the school constitution monitoring. At present, we use boy students’1000-metre race and girl students’800-metre race to measure their cardiorespiratory endurance.There have been controversies about whether these two method are capable of reflecting the students’ cardiorespiratory endurance exactly.the 20-mSRT is one of the most effective measurements in cardiorespiratory endurance in developed countries.In this essay, the physiological and biochemical indexes in the 20-mSRT and 1000-m race will be analyzed, thus comparing and revealing the characteristics of energy metabolism and the changes in human cardiovascular system in the course. Lab control will be used in the measurement of VO2max so as to discover the relation between the aerobic endurance index and 20-mSRT and 1000-m race. Hopefully, these will provide some reference for relevant departments in policy making of constitution monitoring.Research methods:30 male college students aged from 10 to 22 will be selected as my research objects in the 20-mSRT and 1000-m race. During the process, the physiological and biochemical indexes such as heart rate and BLA will be tested. And the treadmill will be used in measuring the objects’ VO2max, thus analyzing the relation between Vo2 Max and the two tests.Research results:1、The performance of heart rate in the 20-m SRT:The heart rate is in a sharp rise during the first two minutes, while after the second minute till the seventh minute, it will grow steadily and tend to be stable till it reaches the maximal point at the eighth minute. The average heart rate is 168.3±3.62 times/min, while the average HRmax is 192.0±6.94 times/min. Most of the heart rates are distributed above 160 times/min. The exercise intensity in the 20-mSRT calculated by the Karvonen formula is 93.87%, while it will be 96.05% using the target heart rate calculation formula.2、The performance of heart rate in the 1000-m race:In the first two minutes, it will rise quickly, while from the second to the third minute rise comparatively slow and it will reach its maximal point after the third minute and tend to be stable. The average heart rate is 139.3±9.87times/min, while the maximal point is 168.2±13.23times/min. most of the objects’ heart rates are distributed above 150times/min. The exercise intensity in the 20-mSRT calculated by the Karvonen formula is 80.34%, while it will be84.14% using the target heart rate calculation formula.3、There is no obvious difference in average BLA(p>0.05) before the 20-mSRT、 1000-metre race (3.53±2.26mmol/L、3.25±1.86mmol/L). However, there is a difference in instant average BLA (p<0.05) after the 20-mSRT.1000-m race(11.36± 4.31mmol/Land 12.96±4.28mmol/L), and the one after the 1000-m race is obviously higher.4、The average heart rate and HRmax in the 20-mSRT are high than those in 1000-metre race. (p<0.05)5. The predicted VO2max in the 20-mSRT and the one in actual treadmill running test are closely related with each other.(r=0.831) The result of the 20-m SRT is correlated with the relative magnitude of VO2max (r=0.783), while the result of the 1000-m race is correlated negatively with it.The conclusion can be made under lab condition:1、The heart rates of the objects in the 20-m SRT are mostly distributed at a high level, indicating that the 20-m SRT belongs to large-intensity exercise.2、The heart rates of the objects in the 1000-m race are mostly distributed in a relatively high level, indicating that the 1000-m race belongs to the moderate-intensity or large-intensity exercise.3、The average heart rate and the maximal point in the 20-m SRT are both higher than those in the 1000-m race.4、The instant BLA after the 1000-m race is higher than that after the 20-mSRT, which means that there is better efficiency in energy consumption for anaerobic glycolysis in the 1000-m race.5Both the 20-m SRT and the 1000-m race are closely related with the VO2max which reflects the indexes of aerobic endurance. However, the mechanisms of their interaction with the VO2max are different from each other.