Cool Down?

My coach today told me that cooling down at the end of practice was not good for the body. He said it could rip muscles that were just worked. I have always been taught that the cool down was important, especially after working hard and getting the heart rate up. Keep in mind that this is an USA-S practice and those I'm swimming with are teenagers. I'm curious what others think?
Parents
  • Sprint events typically produce much higher concentrations of lactate than distance events, so you may want to revisit this theory. When swim 50 you work anaerobically very little time to be affected so much by lactate. A bit more risk when you swim 100. But the worst are 200 and 400 which are swum with a heart rate higher than anaerobic threshold and you swim it long enough to achieve very high lactate concentration. Long distance swimmers also tend to cross anaerobic threshold when they swim events. As a result you can see swimmers who just suddenly lose their speed - lactate concentration is so high that muscles just give up. They understand they need to swim faster but they can't physically. Example: Recently I watched Universiade - 10km running marathon. The guy who was leading entire distance suddenly stopped and started to move like a drunkard - it was obvious that he got disorientated and in couple seconds he just fell down. For me it is pretty clear that it was because of the too high lactate concentration.
Reply
  • Sprint events typically produce much higher concentrations of lactate than distance events, so you may want to revisit this theory. When swim 50 you work anaerobically very little time to be affected so much by lactate. A bit more risk when you swim 100. But the worst are 200 and 400 which are swum with a heart rate higher than anaerobic threshold and you swim it long enough to achieve very high lactate concentration. Long distance swimmers also tend to cross anaerobic threshold when they swim events. As a result you can see swimmers who just suddenly lose their speed - lactate concentration is so high that muscles just give up. They understand they need to swim faster but they can't physically. Example: Recently I watched Universiade - 10km running marathon. The guy who was leading entire distance suddenly stopped and started to move like a drunkard - it was obvious that he got disorientated and in couple seconds he just fell down. For me it is pretty clear that it was because of the too high lactate concentration.
Children
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