To obtain a mechanical action, a heavier pressure is called for than that which we use if pure reflex action is desired. It would seem that there are four possible ways in which our massage movements can exert a mechanical effect:-

(i.) By assisting the circulation. (ii.) By aiding the movement of the lymph. (iii.) By tension on some structure which we hope to free or stretch. (iv.) By the effect of pressure on the abdominal viscera.