Heart rate variability (HRV) can reflect the changes in the autonomic nervous system (ANS) that are affected by apnea or hypopnea events among patients with obstructive sleep apnea hypopnea syndrome (OSAHS). To evaluate the possibility of using HRV to screen for OSAHS, we investigated the relationship between HRV and polysomnography (PSG) diagnostic indices using electrocardiography (ECG) and P...

A spring-fall asymmetry is observed in daytime amplitude values of very low frequency (VLF) radio wave signals propagating over the North Atlantic during 2011–2019. We explore processes behind this by comparing against mesospheric mean temperatures and semidiurnal solar tide (S2) winds. The radiation influence on VLF subionospheric propagation was removed from values, isolating fall-effect. Sim...

In this paper, we consider variable-length coding over the memoryless binary asymmetric channel (BAC) with full noiseless feedback, including symmetric (BSC) as a special case. 2012, Naghshvar et al. introduced scheme, which refer to small-enough-difference (SED) scheme. For binary-input channels, deterministic feedback (VLF) code constructed SED scheme asymptotically achieves both capacity and...

Introduction: Spinal cord injuries are accompanied with significant demyelination of axons and subsequent locomotor dysfunction. To identify the extent of damage following electrolytic lesion of ventrolateral white matter, essential area for initiation of locomotor activity, we assessed demyelination as well as alteration in motor performance. Moreover, the protective effect of estradiol as a c...

Background Alarming somatic symptoms, in particular, cardiovascular symptoms, are the characteristic feature of panic attacks. Increased cardiac mortality and morbidity have been found in these patients. Power spectral analysis of electrocardiogram R-R intervals is known to be a particularly successful tool in the detection of autonomic instabilities in various clinical disorders. Our study aim...

[1] Prompt early/fast perturbations on narrowband sub-ionospherically propagating very low frequency (VLF) signals are the primary evidence for the direct coupling of energy released by lightning discharge to the lower ionosphere. Different mechanisms have been advanced to explain the fast ionospheric perturbations, such as heating and ionization from the lightning electromagnetic pulse (EMP) a...

In this study we examine energetic electron precipitation fluxes driven by lightning, in order to determine the global distribution of energy deposited into the middle atmosphere. Previous studies using lightning-driven precipitation burst rates have estimated losses from the inner radiation belts. In order to confirm the reliability of those rates and the validity of the conclusions drawn from...

s | 29 Abstract Objectives: To compare the risk for subsequent development of mania or hypomania between venlafaxine monotherapy group and Olanzapine augmentation group, the authors conducted a preliminary retrospective medical record review for patients originally diagnosed as unipolar major depression during 7-year follow-up period. Methods: we selected samples from the patients who visited p...

BACKGROUND AND PURPOSE External counterpulsation (ECP) is a noninvasive method used to enhance cerebral perfusion by elevating the blood pressure in ischemic stroke. However, the response of the beat-to-beat blood pressure variability (BPV) in ischemic stroke patients during ECP remains unknown. METHODS We enrolled recent ischemic stroke patients and healthy controls. Changes in the blood flo...

In the present paper we give a new method for estimation and quantification of Heart Rate Variability (HRV) in the VLF,LF,HF bands using the basic concept of variability previously introduced. The method enables to quantify ANS modulation of R-R intervals. In a subsequent paper we will give detailed exposition of the performed and confirming experiments.