Applying ice or heat can provide relief from injuries, aches, and pains, but they shouldn’t be used interchangeably. Generally speaking, ice works well after a sudden injury while heat helps to soothe ongoing muscle aches and pains.
Cold
Cold works for injuries because it narrows your blood vessels, which helps prevent blood from accumulating at the site of injury, which will add to inflammation and swelling while delaying healing. This is also why elevation is helpful; it limits blood flow to the area to minimize swelling.
During immediate treatment, the aim is to limit the body’s response to injury. Ice will:
- Reduce bleeding into the tissues.
- Prevent or reduce swelling (inflammation).
- Reduce muscle pain and spasm.
- Reduce pain by numbing the area and by limiting the effects of swelling.
- These effects all help to prevent the area from becoming stiff, by reducing excess tissue fluid that gathers as a result of injury and inflammation.
A good rule of thumb to remember following an injury is RICE: rest, ice, compression, and elevation.
Ideally, ice should be applied within 5-10 minutes of injury and for 20-30 minutes. You don’t want to use ice longer than this as it could damage your skin or even lead to frostbite. This can be repeated every 2-3 hours or so whilst you are awake for the next 24-48 hours. You’ll want to protect your skin from direct exposure by applying a cloth or towel between your skin and the ice.
Do not use ice packs on the left shoulder if you have a heart condition. Do not use ice packs around the front or side of the neck.
After the first 48 hours, when bleeding should have stopped, the aim of treatment changes from restricting bleeding and swelling to getting the tissues remobilized with exercise and stretching. Ice helps with pain relief and relaxation of muscle tissue.
I bought an ice pocket from Decathlon, and keep ice cubes handy in the freezer to use whenever needed. You can take such bags with you when you play in tournaments, typically the bar at the courts will have some ice if you need to apply cold to a sprain.
I also always take a bag of instant ice with me wherever I play. This guarantees that I will always have ice treatment available whenever I need it.