Taking an after exercise plunge in an ice water bath (a tub of 12 to 15 degrees Celsius ice water) is a common practice among many elite athletes as a way to recover faster, and reduce muscle pain and soreness after intense training sessions or competitions. From elite runners like Paula Radcliff to nearly all professional rugby players, the ice bath is a standard practice routine.

The theory behind ice baths is related the fact that intense exercise actually causes microtrauma, or tiny tears in muscle fibers. This muscle damage not only stimulates muscle cell activity and helps repair the damage and strengthen the muscles ( muscle hypertrophy), but it is also linked with delayed onset muscle pain and soreness (DOMS) , which occurs between 24 and 72 hours after exercise.

Then, with rewarming, the increased blood flow speeds circulation, and in turn, improves the healing process. Although there is no current protocol regarding the ideal time and temperature for cold immersion routines, most athletes or trainers who use them recommend a water temperature between 12 to 15 degrees Celsius and immersion times of 5 to 10 and sometimes up to 20 minutes.

RESEARCH

A study from the July 2008 issue of the International Journal of Sports Medicine found cold water immersion and contrast water therapy may help recovery from short maximal efforts, or during events like stage races where athletes repeat high-intensity efforts on successive days. In this study, researchers had cyclists complete a week of intense daily training routines. After each workout, they used one of four different recovery methods and took nine days off between each week of workouts.