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If an animal adapts, somthing about them permantaly changes. Acclimatization is when an animal changes to suit a particular climate but the changeis not nesserceraly permanant
Metabolic
ac·cli·ma·ti·za·tionn. The physiological adaptation of an animal or plant to changes in climate or environment, such as light, temperature, or altitude.The above retrieved from Answers.comViper1Any of numerous gradual, long-term responses of an individual organism to changes in its environment. The responses are more or less habitual and reversible should conditions revert to an earlier state. These criteria differentiate acclimatization from ho from growth and development (which cannot be reversed); and from evolutionary adaptation (which occurs in a population over generations). Acclimatization can occur in anticipation of a change and enable organisms to survive conditions beyond their natural experience. Examples include adaptations to seasonal changes and adjustments to changes in altitude. Above retrieved from Answers.com
It remains Polarized.
It changes the metabolic functions. The metabolism
These are the metabolic reactions.
Cardiac cycle
G A. Martini has written: 'Metabolic changes induced by alcohol'
Cardiac Cycle
Check out the related link to learn more about measuring changes in O2 or CO2 and metabloc rates.
Assuming you mean American football and NOT European Football (soccer) Yes it is. American football resulted because of a number major diverse changes to the rules of rugby, most notably the rule changes instituted by Walter Camp, who is considered the "Father of American Football".
There will be cardiac changes. As there will slowly be less stress on the heart and vital organs, you should be able to move around better with ease.