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  2. Schumann resonances - Wikipedia

    en.wikipedia.org/wiki/Schumann_resonances

    The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.

  3. Heart rate - Wikipedia

    en.wikipedia.org/wiki/Heart_rate

    Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (beats per minute, or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide .

  4. Heart rate variability - Wikipedia

    en.wikipedia.org/wiki/Heart_rate_variability

    Heart rate variability visualized with R-R interval changes Electrocardiogram (ECG) recording of a canine heart that illustrates beat-to-beat variability in R–R interval (top) and heart rate (bottom). Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the ...

  5. Electrical cardiometry - Wikipedia

    en.wikipedia.org/wiki/Electrical_Cardiometry

    Current is directed toward the aorta because blood is the most conductive material in the thorax. The ratio of applied current and measured voltage equals the conductivity (or bioimpedance), which is recorded over time. [2] The steep increase in conductivity seen beat to beat is attributed to the orientation of red blood cells.

  6. Impedance cardiography - Wikipedia

    en.wikipedia.org/wiki/Impedance_cardiography

    Impedance cardiography (ICG) is a non-invasive technology measuring total electrical conductivity of the thorax and its changes in time to process continuously a number of cardiodynamic parameters, such as stroke volume (SV), heart rate (HR), cardiac output (CO), ventricular ejection time (VET), pre-ejection period and used to detect the impedance changes caused by a high-frequency, low ...

  7. Magnetocardiography - Wikipedia

    en.wikipedia.org/wiki/Magnetocardiography

    Heart signals were indeed seen, but were very noisy. The next development was by David Cohen , [ 2 ] who used a magnetically shielded room to reduce the background, and a smaller coil with better electronics; the heart signals were now less noisy, allowing a magnetic map to be made, verifying the magnetic properties and source of the signal.

  8. Simple blood test could predict a person’s heart disease risk ...

    www.aol.com/news/simple-blood-test-could-predict...

    About 13% — roughly 3,600 participants — had either a heart attack or stroke, had surgery to fix a narrowed or blocked artery, or died from heart disease over the 30-year follow-up period.

  9. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    In a normal heart, the heart rate is the rate at which the sinoatrial node depolarizes since it is the source of depolarization of the heart. Heart rate, like other vital signs such as blood pressure and respiratory rate, change with age. In adults, a normal heart rate is between 60 and 100 bpm (normocardic), whereas it is higher in children. [57]

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