Try this website: http://www.diabeticshoeshub.com. They list whether the shoes are coded A5500. Even if you don't want to buy online, you can write down the manufacturer and model.
Yes, a 5500 watt generator should be able to run a 1 horsepower motor. A typical 1 horsepower motor requires around 750-1000 watts to operate, so the generator's output should be sufficient. Just make sure to check the starting wattage of the motor to ensure the generator can handle any initial surge in power.