Modulation of cardiac rhythm in the humans exposed to extremely weak alternating magnetic fields

The cardiovascular response to an acute 1800-μT, 60-Hz magnetic field exposure in humans

“…or nitric oxide ion transport responses (Bauréus Koch et al 2003;Okano and Ohkubo 2003), changes to membrane protein binding function (Sastre and Kavet 2002), the extension of free radical life (Crumpton 2005), and gene induction through heat-shock protein alterations (Tokalov and Gutzeit 2004;Lin et al 2001). A recent line of investigation by Lednev et al (2008) has investigated the MF effects of using different frequencies tuned to specific atomic properties on indices of heartbeat timing.…”

Biological effects related to geomagnetic activity and possible mechanisms

“…Other researchers imply that geomagnetic pulsations may cause biological effects [Kleimenova et al, ; Matveyeva and Shchepetnov, ; Breus et al, ]. According to Lednev's hypothesis, resonance‐like conditions can be induced by Pc‐1 geomagnetic pulsations, particularly at Bac = 64 pT and f = 1 Hz, Bac = 32 pT and f = 0.5 Hz, and several other combinations of amplitude and frequency [Lednev, ; Lednev et al, , ]. This speculation implies that quasisinusoidal low‐frequency magnetic fields of Pc‐1 geomagnetic pulsations may modulate magnetic moments created by the orbital movement of electrons in atoms and initiate a chain of events leading to metabolic changes registered by a particular experiment [Lednev, ; Lednev et al, , ; Belova et al, ].…”

“…Despite all doubts, the number of empirical findings describing significant correlations between geomagnetic activity and biological parameters has steadily increased over time [Zhadin, ; Dimitrova et al, ; Mendoza and de la Pena, ; Papailiou et al, ; Breus et al, ]. In the past, attempts were made to determine the mechanisms by which geomagnetic activity influenced biological activity [Shem'i‐Zade, ; Durand‐Manterola et al, ; Cherry, ; Lednev et al, ; Belova et al, ], but these primarily theoretical studies did not include reliable experimental confirmation. Today's weather forecasts include information about geomagnetic activity; however, we do not know the exact mechanisms by which geomagnetic disturbances may affect organisms.…”

Development of Computer Aided Prediction Technology for Paroxysmal Atrial Fibrillation in Mobile Healthcare

“…All HRV features were calculated from the detrended RR interval series. In each RR interval set, the following HRV features were calculated using the ECG analysis software (also available at http://mhealth.kaist.ac.kr/afdectection): mean heart rate (mean HR), mean heartbeat intervals (mean RR), standard deviation of NN interval (SDNN), coefficient of variation (CV), root mean square of successive differences (RMSSD), and percentage heartbeat intervals with difference in successive heartbeat intervals greater than 50 ms (PNN50) as time domain features; HRV index (bin width of 8.0 ms), triangular interpolation of heartbeat interval histogram (TINN), and stress index (SI) (Lednev et al, 2008) as geometrical analysis features; and LF (LF 0.04-0.09 Hz), HF (HF >0.1 Hz), the ratio of LF to HF (LF/HF), normalized LF (LFnu) and normalized HF (HFnu) components as frequency domain features (Task Force, 1996). Among the HRV features, the RMSSD is worthy of further mention because it has been used to indicate the levels of mental or physical stress of a subject (Task Force, 1996).…”