中长跑是学生体育达标的主要测试项目,也是冬季教学的主教材,它能有效地促进人体血液循环,提高心肺功能,增强肌肉骨骼的运动能力和提高神经系统的灵活性。但很多学生(尤其是女生)除了怕苦怕累外,还担心把腿跑粗,影响形体美,因而缺少练习长跑的积极性。 生理学研究表明,肌肉纤维的数量是天生的,不会随着体育锻炼而增加。在进行强度大而用力时间短的力量性练习时,肌肉的横断面会变粗,但一些强度较小、时间较长、消耗较 Middle and long-distance running is the main test item of students’ PE standard and also a master textbook for winter teaching. It can effectively promote blood circulation, improve cardiopulmonary function, enhance musculoskeletal motility and increase nervous system flexibility. However, many students (especially girls) are not only afraid of being afraid of being tired, but also worried about running their legs thick and affecting body shape, thus lacking the enthusiasm for practicing long-distance running. Physiological studies have shown that the amount of muscle fibers is innate and does not increase with physical activity. In the strength of the force of short time strength exercises, the muscle cross-section will be thicker, but some less intensity, longer, more consumption