The 100 meter dash is a quick and short run requiring explosive speed.On completion of the dash the runners will continue to breathe hard for several seconds to minutes even though they are no longer running.Which of the following is the best explanation for why this is so?
A) Since the exercise was mostly aerobic exercise, the runners' bodies have not yet realized the run is over.
B) The runners' fast oxidative muscles are so slow to utilize oxygen it only begins aerobic respiration by the time the run has finished.
C) The runners' use of stored oxygen, glucose and creatine phosphate is being replenished and this requires a prolonged increase of oxygen intake.
D) Slow oxidative fibers are recruited last and have only started to work at completion of the run.

Question

Quizplus · Accepted Answer

During the 100 meter dash, the runners use stored oxygen, glucose and creatine phosphate for energy. After the run, their bodies need to replenish these energy sources and this requires a prolonged increase in oxygen intake. This is why the runners continue to breathe hard even though they are no longer running. Option A is incorrect because the 100 meter dash is mostly anaerobic, not aerobic. Option B is incorrect because fast oxidative muscles utilize oxygen very quickly, not slowly. Option D is incorrect because slow oxidative fibers are recruited first for endurance activities, not last for short bursts of speed like the 100 meter dash.

The 100 Meter Dash Is a Quick and Short Run