User:Cmcgrathqueens/sandbox

Submersion into cold water can induce cardiac arrhythmias (abnormal heart rates) in healthy people, sometimes causing strong swimmers to drown. The physiological effects caused by the diving reflex conflict with the body’s cold shock response, which includes a gasp and uncontrollable hyperventilation leading to aspiration of water. While breath-holding triggers a slower heart rate, cold shock activates tachycardia, an increase in heart rate. It is thought that this conflict of these nervous system responses may account for the arrhythmias of cold water submersion.

Upon submersion into cold water, remaining calm and preventing loss of body heat is paramount. While awaiting rescue, swimming or treading water should be limited to conserve energy and the person should attempt to remove as much of the body from the water as possible; attaching oneself to a buoyant object can improve the chance of survival should unconsciousness occur.

Comments
Thanks for sharing your proposed changes. I made a few copy edits and spacing changes.