中文摘要：

目的：通过对在校大学生不同强度骑车运动的比较研究,探讨不同运动强度对大学生健身功效的差异.方法：随机抽取30名北京师范大学学生（其中男、女各15名）,分别以45％、55％、65％ VO2max强度进行功率自行车运动,采用气体代谢法测定机体的气体代谢量、能耗量及主观体力感觉程度.结果：随着运动强度的增大,心肺功能的各项指标呈上升趋势,糖氧化分解量和总能量消耗逐渐增大,而脂肪的供能量在55％ VO2max强度时达到最大,在65％ VO2max度时反而下降.结论：45％ VO2max强度的骑车运动,心率介于115～137次/min,是大学生初期健身的最佳强度;55％VO2max强度的骑车运动,心率介于138～ 156次/min,是大学生塑身减肥的最佳强度;65％VO2max强度的骑车运动,心率介于157～ 174次/min,是发展大学生有氧耐力的最佳强度.

英文摘要：

Objective ： To study and compare the differences of different exercise intensities on college students＇ fitness func tion through the comparative study of different intensity cycling. Methods ：30 students from Beijing Normal University were chosen randomly（ 15 male students and 15 female students） and performed cycling tests under the intensities of 45%, 55% ,65% VO2. During the exercise, the amount of gas metabolism, energy expenditure and perceived rate of exertion were analyzed through the respiratory gas, as well as rating of perceived exertion, RPE. Results：With increasing exercise intensity, each index of cardiopulmonary function is on the rise, CHO oxidation and total energy expenditure increase grad ually, fat oxidation at the intensity of 55 % VO2max is maximal while decreases at the intensity of 65 % VO2max. Conclusions： Cycling under the intensity of 45 % VO2m2, with heart rate changes between 115 - 137bpm, is the optimal intensity for col lege students＇ physical fitness at preliminary stage. Cycling under the intensity of 55% VO2 with heart rate of 138 -156bpm,is the optimal intensity for college students to lose weight. And cycling under the intensity of 65% VO2 with heart rate between 157 - 174bpm,is the optimal intensity for them to aerobic endurance.