We are all aware that what works for one may not work for another. Ice after an injury helps to slow swelling and blood flow to the area. Heat then must do just the opposite. Some injuries respond better with a combination ie. a whirlpool bath with 103 degree hot water aside another with a cold fill. As to using one or the other the night before the game needs better examination. Some might question a heat potion massage after every game or practice, except when injury is involved , to lessen arm problems . It has worked for many athletes.