E groups,the ES groups,ESE groups each week exercise 6,previous 3 weeks swimming time increases progressively from 10 minutes to 60 minutes,each week increases 20 minutes,and maintains this exercise time 7 weeks.

• E组、ES组、ESE组每周运动6次,前3周游泳时间从10 min递增至60 min,每周增加20 min,并保持此运动时间7周;