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Exercise Physiology: Why Lactate Is Not the Villain

A tour of how your body fuels, cools, breathes and adapts during exercise, and the myths it quietly overturns.

Exercise Physiology · 50 questions

Try 3 questions

1. Which energy system supplies most of the ATP during a maximal 10-second sprint?

  1. Aerobic oxidation of glucose
  2. Aerobic oxidation of fat
  3. The phosphocreatine system
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Answer: The phosphocreatine system

Phosphocreatine regenerates ATP almost instantly but runs low within about 10 seconds, so it dominates very short, all-out efforts.

2. In an all-out effort, at roughly what duration does aerobic metabolism start supplying about half of the energy?

  1. About one to two minutes
  2. About ten to fifteen minutes
  3. About thirty to sixty minutes
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Answer: About one to two minutes

Aerobic metabolism contributes more than most people think: the crossover point with anaerobic sources in maximal efforts falls near 75 seconds.

3. How long would the ATP already stored in your muscles last during maximal effort, if it were not replenished?

  1. Only a few seconds
  2. About five minutes
  3. About one full minute
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Answer: Only a few seconds

Muscles hold only a tiny ATP reserve, enough for roughly 2-3 seconds of maximal work, so ATP must be regenerated continuously.

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