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游泳训练实践表明,种种能力的培养,种种素质的发展都有一个时机问题,机不可失,失不再来。9—10岁的儿童身高、体重差异较小,第二性征尚未出现,身体生长发育保持相对平衡,而神经系统处于较快的发展阶段。中枢神经高度兴奋,肌肉抑制过程很弱,注意力不集中,容易疲劳,心脏容积不大,单位时间内的输出量不大,安静时心率相对较高,要加强心脏的活动主要靠提高心脏收缩频率完成,耐力指标出现大幅度提高,男女之间速
Practice shows that swimming training, all kinds of ability to cultivate, all kinds of quality development has a timing problem, must not be missed, lost no longer come. Children of 9-10 years old have small differences in height and weight, secondary sexual signs have not yet appeared, body growth and development remain relatively balanced, and the nervous system is in a relatively rapid stage of development. High central nervous excitement, the process of muscle inhibition is weak, inattention, fatigue, heart volume, output per unit time is not large, quiet heart rate is relatively high, to enhance heart activity mainly by improving cardiac contractility The frequency is completed, the endurance index increased significantly, the speed between men and women