4 ms·
> Cardiac activity can be divided into two phases: systole, when the heart muscle contracts and pumps out blood, followed by diastole, when it relaxes and refil
by sradman 6y ago
> Cardiac activity can be divided into two phases: systole, when the heart muscle contracts and pumps out blood, followed by diastole, when it relaxes and refills with blood.
Respiration, acting through the sympathetic (fight or flight) nervous system (breathing in) and the parasympathetic (feed and breed) nervous system (breathing out) also impacts the heart as measured through Heart Rate Variability. Like many systems in biology, I suspect there is a network of feedback loops at play and they act in both directions.
- elric 6y agoThe way I understand it is that this is partly a mechanical property as well: the chest cavity expands/contracts while breathing, which impacts how much room organs have, which can then stimulate nerves etc.
- james_s_tayler 6y agoIm waiting on my emWavePro to come in the mail so I can start training cardiac coherence. The science behind it is fascinating.