Reply To: Failure quirk?

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#3089
Avatardoc
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AlanP,
Interesting question. Years and I mean years ago. I had my distance kids swim with HR monitors on and they would do 30 x 100 on 1:10, noticed the same thing. HR would be high and struggle a bit through the first 5 to 7 minutes, then HRs would become steady along with pace in just about the same time frame you explain and then after 20 minutes or so we would actually see a drop in HR and lower number of cycles used to cover then same time. They would say “if I can get through the first 6-7, I’ll make everyone.

One thought I had was at about 20 minutes of activity the body shifts to using fat as an energy source. Its more efficient, therefore the reduction/efficiency in energy output. So the cycles and HR drops.

This was one explanation by exercise physiologist of the “2nd Wind” in running which occurred usually in that 20+ minute range. Not really sure if that’s it. But did sound reasonable based on an understand of physiology.

Doc


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