Acute or chronic physiological processes

Chose one of the following topics from below and define the acute or chronic physiological processes (what is happening on a microscopic level in the body) behind it along with what other systems of the body are heavily involved:
 
– An Athletic movement to improve (Increase of strength, cardiovascular system, flexibility, Specific recovery techniques etc)
– An interesting topic (Loss of breath in a cold shower, deep sea divers, REM cycle during sleep)
– A common experience (Leg burn in a workout, Heat acclimation, recovery from an injury, DOMS)
– Special population (Training with Diabetes, after heart surgery, high blood pressure, arthritis, etc)
 
 
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