If an athlete takes a direct blow to the head, neck or back during an event, practice or game and becomes unconscious you should always:

The answer to this question is that the athlete should be provided first aid or assistance that will stabilized the neck and head of the athlete before the ambulance arrives.  When a head injury happened a medical care should be called when a person is unconscious. Head injuries like a hard blow in the head can cause fatality or even disability.  

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a physical change is being made.