Final answer:
To use an AED during cardiac resuscitation, continue CPR until AED pads are applied and ready; the AED will then provide instructions on whether a shock is needed.
Step-by-step explanation:
When integrating an Automated External Defibrillator (AED) into the emergency care of a football player who appears to be in cardiac arrest, the correct action is to continue CPR until the AED pads are in place and the machine is ready to analyze the athlete's heart rhythm. Once the AED is set up, it will advise whether a shock is necessary based on its automatic analysis of the patient's heart condition. If a shock is required, the AED will charge to the appropriate energy level and indicate when to administer the shock. CPR is crucial as a life-saving intervention and is recommended before using a defibrillator to manually compress the blood within the heart, thus maintaining blood flow especially to the brain to avoid irreversible damage.