Beat-to-beat variability reflects constant human body adaptation to the environment. For example, numerous receptors located in the major arteries monitor blood pressure. If the blood pressure drops the heart immediately increases heart rate to compensate for a drop in the blood pressure. If a person is “stressed out” heart rate increases and blood supplies more oxygen to vital organs.
The best possible analogy is to recall standard shift car driving. Poor timing of gas and brake pedals shifts results in a stalled engine. The heart rate has been regulated by two “pedals”. One of the sympathetic system which is the “gas” and parasympathetic system which is the “brake”. Contrary to common opinion Dr. Golosarsky believes the two systems are not always antagonistic, but synergistic. Sympathetic system chooses a level of the heart function and parasympathetic system adapts the heart to that level of functioning.
The human body continually adapts to the environment with the least energy expenditures. This is achieved by constant assessing of the environment by inner and external sensors.
The malfunctioning of various sensors causes heart often to contract faster, consuming more oxygen and energy. This makes heart more susceptible to dangerous arrhythmias or even sudden death. Hundreds of recent scientific studies demonstrated that sympathetic and parasympathetic system discoordination is one of the major causes of dangerous arrhythmias and sudden cardiac death.