Your functions and blood are all moving by the force of gravity, so when everything is raised or lowered(moving your arm), your pulse wave changes. This can also result from subtlty in higher blood pressure, when activity occures. Just as your pulse waves changes in the rest of your body when excersising, you will have a slight change in pulse when simply moved your arm up and down, you're gettin' that blood pumping! ;)
Hope this helps :)
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A. because even though it is not ideal to ever be stressed out to the point of it inflicting your heart. It is common for athletes do that to condition there hearth and lungs to function at the highest of extremes possible.
