by MISSY ALBRECHT, DPT, CSCS, FMS| Physical Therapist/Coach
What are the main reasons people ice? Usually to calm swelling/inflammation, to numb pain, and “to make sure I don’t hurt after a workout” (a.k.a pain prevention). We will get into whether ice helps those things, but let’s start with what icing does to the body physiologically.
The Body’s Physiologic Response to Ice: Strictly the Facts. 
When ice is applied to the body, the cold acts to vasoconstrict (narrow) the blood vessels. This causes reduced blood flow to the area, stopping swelling/inflammation. The cold sensation also affects the brain by blocking pain signals that may have been being sent to the brain from the injured area.
What is Swelling? 
We’ve all been injured right? Either the pain stops us from moving, or we think that we shouldn’t move because we need to let our bodies heal. So we sit with _____ body part supported and don’t move ; although we want to move, the pain is too much to handle. Consequently, we end up sedentary, thus allowing the waste product of swelling to accumulate — this leads to tissue damage and slow/no healing. This is why movement is so important: it allows for the evacuation of the fluid from the injured area back to the heart where the body can help dispose of it through the lymphatic system.
Why Icing May Have Negative Effects
Something to also keep in mind, said by a very smart man:
We were engineered to have inflammation and heal without external aids. We need the help when we are unhealthy; when we are unable to rest long enough to recover from the injury; or when we continue to push through injury and cause more damage and excess/chronic inflammation.
When Icing May Still Be Helpful
Ice can definitely help with pain. It can also be used to help athletes recover when used in an ice bath during the 30 minutes following a tough workout/event. Research is touchy on this subject, which you can read a little about here and here on our blog. Contrast baths can also be beneficial (alternating ice and heat) to flush out the accumulation of fluid.
Alternatives To Icing
- Mobilize joint
- Muscle contraction
- Compression or voodoo band
- Electrical stimulation (like the Marc Pro)
My main issue, which brought up this blog topic in the first place, is with those who ice after every workout. I do believe this could cause more damage than help, primarily because it is not allowing for proper healing after the workouts. The exception would be if you did a rockstar workout/competition and need the ice for the ice bath recovery theory described above. Secondly, I think many people are using it to help for pain relief from the workout or because they assume it will be painful later. I said earlier that icing for pain is okay, but only if you are doing something on the side to help figure out what is causing the pain and modifying as needed while it heals. “It” won’t heal and go away if you just keep icing it. So if you’re someone who does ice after workouts, make sure you know WHY and whether or not you’re doing it for the right reasons.