Two important qualities reinforced by aquatic physiotherapy are muscle elasticity and physical resistance.
In effect, hydrotherapy is suitable in case of decrease of muscle elasticity, in which the possibility of movement is reduced; this type of training allows the recovery of the property of contractility. The exercises in water imply less effort in comparison with dry workout, but in the meantime they lead to a quicker regaining of muscle elasticity. This is due to the improvement of the supply of blood in the tissue, resulting from the minor weight supported by joints. In fact, in water the weight of a body decreases, as stated by the Archimedes’ principle: any body fully or partially submerged in a fluid at rest is acted upon by and upward force, the magnitude of which is equal to the weight of the fluid displaced by the body.
Hydrotherapy and physical resistance
Hydrotherapy also can be used to strengthen the physical resistance. In fact, the water resists to the movements inside of it because it is denser than air; this friction allows the training of muscles and of physical resistance.
Aquatic physiotherapy is appropriate for people of all ages, as the results can be reached without the risks and the “aggressiveness” of the dry workout.
Moreover, hydrotherapy provides the improvement of a great variety of other physical properties, among which strength, speed, and neuro-muscular coordination.