Kidney... the weight of the kidneys constitutes only about .5 percent of total body weight, yet they normally receive 20% 25% of cardiac output. The kidney functions to eliminate waste products while conserving water and important electrolytes (ions) and metabolites in the 'normal' range for body pH balance, as well as preventing pH deviations in cerebral spinal fluid alkalinity.

The kidney has one of the highest metabolic rates in the body. It only needs to use 10 percent of the oxygen available to it, and it also has access to large quantities of electrolytes (that determine electrical activity of cells). Electrolyte balance is maintained by reabsorption of ions from the blood plasma by the kidney, as well as injestion of ions from water and air. The kidneys will adjust the sodium ion (Na+) absorption up or down, placing more or less bicarbonate into the blood. If the amount of anions are insufficient to balance cations, body pH becomes acid. The body maintains a normal extracellular pH in two ways, through buffers like bicarbonate, and by excretion of CO2 by the lungs.

As long as the relative number of anions and cations is maintained, the total number of ions can go up or down and body pH will be sustained at normal alkalinity. Metabolism can be stimulated by increasing the demand for electrolytes with specialized exercise that can supply the necessary ions for pH balance. Otherwise body pH will drop, as it usually does with an increase in physical activity. Cellular function is optimal when the pH of intracellular and extracelluar fluid is held at a specific value. Protein requires acid base equilibrium to maintain it's shape and function. The balance of anions and cations inside and outside the cell determines the speed of polarization which affects cell growth and renewal. As long as all the tissues in the body are provided with sufficient electrolytes, the result will be an acceleration of cellular rejuvenation (if not cells wear out from acid stress). By stimulating nerve and endocrine centers Body'Fit pH Fitness™ exercise (short form... pHx™) presents a new efficient way to promote metabolic function during exercise. The warm-up routine serves to increase rather than decrease circulation to the kidneys. And most importantly unlike the action of the kidney, which can take several days to restore pH balance, the respiratory system can cause a change in minutes especially when the efficiency of C02 excretion is optimized with Body'Fit pHx. 

The kidneys which are also endocrine organs producing kinins related to transcellular electrolyte transport, blood clotting, and a relaxation of vascular smooth muscle in blood vessels that lowers blood pressure. They're the site of one of the principle humoral mechanisms involved in regulation of blood volume, and release adrenaline and cortico steroids. They also secrete renin which participates in glycogen metabolism. Although the theory that it's mechanisms maintain constant blood flow regardless of perfusion pressure remains controversial, the large quantities of electrolytes in the kidneys are a clue to what is responsible for maintaining speed of metabolic activity, a chief determinant of blood flow. Catecholamines constrict renal vessels, with the greatest effect from norepinphrine which is released during almost any kind of physical training. Body'Fit pH Fitness is unique in that it transforms the action of norepinephrine from vaso-constriction to vaso-dilation by stimulating release of adenosine in the abdomen immediately after increasing heart rate with venous return instead of adrenaline.