“After physical activity， your heart is still beating faster than normal， your body temperature is higher and your blood vessels are dilated，” write the health experts at the American Heart Association. “This means if you stop too fast， you could pass out or feel sick. A cool-down after physical activity allows a gradual decrease at the end of the episode.”
但是，现实情况是，很多人到健身房了就开练，练完就撤。2.肌肉柔韧性还如上述所讲，长时间的肌肉收缩会使肌肉产生一直收缩的记忆，如果一直不拉伸，就算是肌肉放松后肌肉也会聚集到一块，变得坚硬，大大降低肌肉的柔韧性，而我们在平时的运动中，往往需要身体中好几种肌肉进行收缩扩张的配合才能完成
19. Kiisa Nishikawa 1 ， Samrat Dutta 2 ， Michael DuVall 2 3 ， Brent Nelson 4 ， Matthew J Gage 5 ， Jenna A Monroy 6.Calcium-dependent titin-thin filament interactions in muscle: observations and theory.J Muscle Res Cell Motil. 2020 Mar;
