Mark Burnley, an endurance physiologist at the University of Kent, investigates the biology that underpins how fast somebody can run at a variety of distances, from sprints to ultramarathons.
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In the longest races, a slower pace and quick catnaps had a significant protective effect on the muscles
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Then we have aerobic glycolysis, the primary engine of aerobic endurance activities. The “vacuum” for lactate and other byproducts firmly resides within this system. Compared to the PCr and anaerobic glycolytic systems, aerobic glycolysis produces significantly more ATP but much slower.
One recent study found that the majority of runners try to ‘bank’ sleep ahead of a long race by sleeping longer at night or napping during the day.
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However, these fluctuations will matter a lot more in an aerobically untrained individual because they lack the vacuum components to use their lactate.
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Mitochondria in your muscles receive the lactate and oxidize it into molecules to create energy to sustain exercise. As all good students of Uphill Athlete know, mitochondrial density is increased through aerobic base training.
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To summarize, as intensity increases, aerobic glycolysis will start to hand off the responsibility of keeping you moving to anaerobic glycolysis because oxygen demands are higher.
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