体育课是学校工作的中心环节,在体育教学日趋科学化、规范化的今天,体育课运动量的合理安排已越来越引起人们的重视。 运动量就是学生做练习时身体所承受的生理负担量,它与运动的强度和密度成正比。运动生理学表明:“机体对刺激作用的反应从属于所受刺激的性质、强度和密度。弱的刺激不能引起机体功能的变化,而太强的刺激则有破 Physical education is the central part of school work. With the teaching of physical education becoming more and more scientific and standardized today, the rational arrangement of the amount of physical exercise has drawn more and more attention. Physical activity is the amount of physical stress the body is exposed to when exercising, which is proportional to the intensity and density of the exercise. Exercise physiology shows that: "The body’s response to the stimulus is subordinate to the nature, intensity and density of the stimuli it is subjected to. Weak stimuli do not cause changes in the function of the body, whereas stimuli are too strong