The DPA now has an added software feature that measures Heart Rate Variability. Decreased HRV implies decreased ability to respond to changes in the environment. Too much consistency in heart rate (less variability) is often associated with dysfunction and disease. The DPA software analyzes imperceptible changes in the heart rate waveforms, provides indices and evaluates the current body condition and activities/balances of the autonomic nervous system.
Low HRV has been shown in numerous longitudinal studies to be related to a higher mortality rate in both healthy and unhealthy subjects. It thus can be shown to be a strong predicator of all-cause mortality. The heart is not just a simple pump, but a complex sensory organ with its own functional "heart brain" that communicates with and influences the brain via the nervous system, hormonal system and other pathways.
Research has shown that these influences profoundly affect brain function and most of the body's major organs. Science now confirms that stress significantly increases the risk of heart disease, including sudden cardiac death. Unmanaged emotional stress is equally if not more important than physical variables in determining health outcomes. A conservative estimate is that 75% of visits to primary care physicians are due to stress-related disorders.
Cardiovascular-related issues are not the only uses for the DPA. Psychologists are increasingly recognizing the importance of HRV. A number of studies have demonstrated that patients with anxiety, phobias and post-traumatic stress disorder (PSTD) consistently show lower HRV, even when not exposed to a trauma related prompt. Importantly, this relationship existed independent of age, gender, trait anxiety, cardio-respiratory fitness, heart rate, blood pressure and respiration rate.
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