Dana Sorensen talks about the controversy of icing, and whether it's appropriate for athletes to ice.
One camp claims that icing restricts blood flow and therefore doesn't help injuries heal. The other camp claims restricting that blood flow allows for a greater release of blood flow after the ice is removed.
From a physical therapist's perspective? If your athlete likes to ice, let them: The placebo effect is real and might help players feel emotionally better about their soreness or pain.
If a player does ice, don't keep the ice there for more than three minutes. Prolonging that effect doesn't increase any potential benefits. Furthermore, players younger than 12 shouldn't have to ice. If they do, this means there are other movement or training issues that are present in the athlete's regimen.