What takes place under a massage therapist’s hands has profound importance for those interested in health and fitness in “tuning up” their bodies. In every sport or form of exercise, massage can help. By helping to reduce physiological fatigue and aid recovery from the exertion of working out or playing, massage enables training better, with longer, more effective workouts, thus facilitating better performance and preventing injury.
Massage acts to disperse the accumulated by-products of muscle action that irritate muscles and nerve endings. Lactic and carbonic acids build up in muscle tissue shortly after exercise begins. These acids are waste products that contribute to causation of the pain and occasional cramping that exercisers, athletes, dancers, etc. suffer during and/or after workouts or performing. These acids are formed when the glycogen stored in the liver and muscles is burned to produce the energy expended during exercise. The acids must eventually be reconverted to glycogen and stored again, or drained out via the lymph and circulatory systems. Pain and fatigue persists until this process of reconverting or excreting is completed. Massage can help eliminate the irritation caused by these wastes, thus increasing muscle recovery rates. When massage has been substituted for rest, an increase from 20-75%, even 100% muscle recovery has been recorded. For example, this is why boxers are massaged rather than rested between rounds.
Massage also aids recovery from soft tissue injuries such as sprains and strains. This is possible because the growth and repair of tissue are accelerated by efficient circulation in the injured areas and appropriate stimulation of the healing tissues. Many soft tissue injuries are not serious enough to cause one to visit a doctor or hospital for treatment, or are only treated with some first-aid, but still cause some discomfort and disability. Massage therapy can often help speed and improve recovery and reduce discomfort from such mishaps. In this way, massage helps bridge the gap between common neglect of injury and major medical intervention.
http://www.cwrl.utexas.edu/~syverson/worldsfair/exhibits/hall2/young/benefits.htm