Heart Beat... impacts health fitness both through the speed of contraction and the force of contraction; often one is achieved at the expense of the other during exercise.

"The greater pulse pressure observed, as heart rate increases during Body'Fit pH Fitness™, signifies stronger heart contractions at all levels of performance intensity."

Physiologically, the force of contraction is greatest in the mid range of stretch of the heart muscle, ie. when the blood volume is not too low and not to high, but moderate. Rather than producing the rapid tachycardia typically observed during other cardio workouts (which can reduce blood flow through the left coronary artery to near zero values when systole is a greater percentage of the cycle), Body'Fit pH Fitness works to develop force of contraction as the priority, increasing heart rate only as force increases. By producing this training effect, it is effective in both strengthening and protecting the heart muscle.

The breathing/ movement patterns encorporated into Body'Fit pH Fitness facilitate the rise in intra-abdominal pressure as the diaphragm descends during inspiration, for example. This also squeezes blood toward the heart because backflow into the leg veins is prevented by the venous valves. and through specific movements. During inspiration when the intrapleural pressure falls, and this negative pressure in the lungs is transmitted to systemic veins. The drop in pressure during inspiration aids venous return, again helped by specific movement, to speed heart rate without sacrificing force of contraction.  Also because contractility increases more with the hormonal influences of the endocrine system, than with the neural influences of the sympathetic and parasympathetic systems, Body'Fit pH Fitness is engineered to coordinate the circulatory mechanisms with both the endocrinal and neural influences producing maximum myocardial contraction strength.

Typically, a change in pH balance happens almost immediately during any exercise session that relies solely on exertion stress (S.A.I.D) to achieve it's goals. (Note that during a heart attack exercisers often have reduced contractility). Reduced levels of oxygen and nutrient delivery to the myocardial cell result in reduced levels of ATP production inhibiting cell contraction. Alterations in acid-base balance in either direction, acidosis or alkalosis, causes changes in enzymes and other proteins which can lead to myocardial dysfunction. Also because contractility is reduced with acid-base pH imbalance, reliance on exertion hyperventilation for oxygen, a drop in end-diastolic volume, decreased Ca++ and ATP concentrations, and increased sodium Na+ and potassium K+ concentrations, most workouts benefit from the added boost Body'Fit pH Fitness gives simply because it doesn't go that route.  

Heart rate typically increases during moderate exercise because the sympathetic system is stimulating cardiac output to compensate for hypoxia in myocardial tissue. Moderate exercise achieves this to a point; however cardiovascular conditioning is also reduced with decreased exertion levels. On the other hand, exercise like jogging can increase heart rate to 180 beats per minute, however the increase in contractability is much smaller. Even in the most highly trained individuals whose cardiac output can reach six or seven times the resting rate, the stroke volume just doubles. Body'fit pH Fitness ensures that both heart rate and contractility are optimized for the most efficient training effect. When performed prior to other forms of training, it's therefore very effective at protecting the heart.