Final answer:
The predominant supplier of ATP during a 200m sprint is anaerobic glycolysis, which breaks down glucose or glycogen without oxygen, following the initial quick use of ATP from creatine phosphate.
Step-by-step explanation:
The predominant source of ATP for a 200m sprint comes from anaerobic energy systems. Initially, ATP already present in muscle cells is used, followed by a very rapid generation of ATP from creatine phosphate which lasts for about 8-10 seconds. As this is quickly depleted during the intense exercise of a 200m sprint, the body relies on anaerobic glycolysis for ATP production.
Anaerobic glycolysis breaks down glucose or glycogen to generate ATP without the need for oxygen, producing lactic acid as a byproduct. This process provides energy fast enough for activities like a 200m sprint but not as fast as creatine phosphate. This ATP supply is usually sufficient for activities lasting around 90 seconds, making it the main supplier of ATP for the duration of a 200m sprint.