Study on the optimal order for the auto-regressive time-frequency analysis of heart rate variability

Carvalho, J.L.H.; Rocha, Adson Ferreira da; Santos, Ícaro dos; Itiki, Cinthia; Nascimento, Francisco Assis de Oliveira

doi:10.1109/iembs.2003.1280453

Cited by 23 publications

(14 citation statements)

References 9 publications

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“…Autoregressive power spectrum estimations with a model order of 20 were performed. 30 High-frequency (HF) power (0.15-0.4 Hz) is considered an index of cardiac vagal activity, whereas lowfrequency (LF) power (0.04 -0.15 Hz) is a baroreflex-mediated response affected by both sympathetic and parasympathetic activity. 15 Each power spectral component was expressed in absolute units, normalized units (power/(total power -very-low (Ͻ 0.03 Hz) frequency oscillations)), the coefficient of component variance in the LF and HF bands (square root of LF or HF power/RR interval).…”

Section: Qrs Detection and Heart Rate Variability Expressed In The Timentioning

confidence: 99%

Heart Rate Variability in Complex Regional Pain Syndrome during Rest and Mental and Orthostatic Stress

et al. 2012

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Background: Complex regional pain syndrome (CRPS) is a pain condition with regional sensory and autonomic abnormalities in the affected limb. The authors studied systemic autonomic and hemodynamic function in CRPS patients during rest, and during orthostatic and mental arithmetic stress. Methods: Twenty patients with CRPS and 20 age-, sex-, and body mass index-matched control subjects participated. Mean values of heart rate variability, baroreceptor sensitivity, blood pressure, stroke volume, cardiac output, and total peripheral resistance were estimated during supine rest and 60°t ilt-table testing. On a separate day, heart rate variability was also measured during mental arithmetic stress testing induced by a paced auditory serial addition task. Results: Heart rate was increased and heart rate variability reduced in patients with CRPS patients compared with control subjects during rest and mental and orthostatic stress,

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Section: Qrs Detection and Heart Rate Variability Expressed In The Timentioning

confidence: 99%

Heart Rate Variability in Complex Regional Pain Syndrome during Rest and Mental and Orthostatic Stress

et al. 2012

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“…A second-order Butterworth high-pass filter with a cutoff frequency of 0.01 Hz was used to filter the R-R time series following a procedure discussed in the literature for HRV analysis (Carvalho et al, 2003). The R-R interval series was interpolated with cubic spline technique and uniformly resampled with a higher sampling rate of 4 Hz.…”

Section: Signal Processing and Analysismentioning

confidence: 99%

An investigation on the influence of yogic methods on heart rate variability

Senthil‐Nathan

Patel

Mariyappa

et al. 2018

Noninvasive Electrocardiol

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Low-frequency breathing (BR <12 cpm) plays a primary role in eliciting physiologically significant changes in HRV. By identifying a similarity in breathing oscillations of HR of FAG, YG, and PBG, the results recognize the coexistence of attention and breathing strategies and postulate their joint role in sustaining autonomic benefits, while effects induced by breathing alone on HRV could be attained even intermittently.

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“…KHD GSY'sinin kestiriminde; kısa süreli sinyaller için daha iyi sonuç verme, daha düzgün spektral bileşenler oluşturma ve her bir bileşenin merkez frekanslarını bulabilme gibi avantajları bulunan özyineleme [autoregressive (AR)] parametrelerine dayanan Burg AR metodu kullanılmıştır (6). KHD analizleri için optimum özyineleme model derecesinin belirlenmesi üzerine yapılan çalışmalar dikkate alınarak, model derecesi tüm sinyaller için 18 olarak seçilmiştir (27,28).…”

Section: Yöntemlerunclassified

Effects of radiation emitted from mobile phones on short- term heart rate variability parameters

Yildiz¹,

Yılmaz²,

Güler³

et al. 2012

Anadolu Kardiyol Derg

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ÖZETAmaç: Bu çalışmanın amacı; cep telefonlarından (CT) yayılan radyasyonun, otonom sinir sisteminin (OSS) girişimsiz bir göstergesi olarak kabul edilen, kalp hızı değişkenliği (KHD) parametreleri üzerindeki etkilerini, bu alanda daha önce yapılan çalışmalardaki eksiklikleri dikkate alarak incelemektir. Yöntemler: Bu amaçla, 30 genç ve sağlıklı deneğin katıldığı randomize kontrollü bir çalışma gerçekleştirilmiştir. Üç periyot şeklinde düzenlenen deney sırasında, CT deneklerin sağ kulağına bir bone vasıtası ile tutturulmuş durumda iken, elektrokardiyogram (EKG) ve solunum sinyalleri kaydedilmiştir. Denekler içerisinden rastgele olarak seçilen 10 tanesi; üç deney periyodunun ikincisinde (Deney Grubu 1), 10 tanesi üçüncüsün-de (Deney Grubu 2) CT'den yayılan maksimum güçlü radyasyona maruz bırakılmıştır. Kontrol grubunda CT kapalı tutulmuştur. Hesaplanan kısa dönem KHD parametrelerine, tekrarlı varyans analizi ve çoklu karşılaştırma testleri uygulanmıştır. Bulgular: Tekrarlı varyans analizi sonucuna göre; gruplar arası değişkenliğin önemli olmadığı fakat deney periyotları arasında bazı parametrelerde anlamlı farklar olduğu ve bu farkların gruplara göre değişik periyotlarda yer aldığı görülmüştür. Çoklu karşılaştırma testleri sonucunda; CT'den yayılan maksimum güçlü radyasyon sebebi ile kalp atım periyotları ve HF gücünde anlamlı farklar bulunmuştur. Sonuç: CT'den yayılan maksimum güçlü radyasyon, genç ve sağlıklı bireylerin KHD'lerinde parasempatik otonom aktivite artışından kaynaklanan değişimlere sebep olabilir. Fakat bu değişimler günlük aktiviteler (heyecanlanma, sıkılma, ayağa kalkma vb.) sırasında görülebilecek KHD deği-şimleri ile benzer seviyededir. (Anadolu Kardiyol Derg 2012; 12: 406-12) Anahtar kelimeler: Cep telefonları, kalp hızı değişkenliği, otonom sinir sistemi ABSTRACT Objective: In this study, the effects of radiation emitted from mobile phone (MP) on heart rate variability (HRV) which is accepted a non-invasive indicator of autonomic nervous system (ANS) were investigated with considering the deficiency of previous studies. Methods: A randomized controlled study has been designed and utilized with 30 young and healthy volunteers. During the experiment that had three periods, the electrocardiogram (ECG) and respiration signals were recorded and MP was attached to subjects' right ear with a bone. Ten subjects selected randomly were exposed to high -level radiation during the second period (Experimental Group 1). Ten of others were exposed during the third period with maximum level radiation (Experimental Group 2). Ten records were also made while MP was closed as a control. Short -term HRV parameters were obtained and repeated measures ANOVA and suitable post-hoc tests applied to the results. Results: According to the results of the repeated measures ANOVA; there were no significant main effects of groups. However, there were some significant differences in measuring time periods and groups*period interactions. The post-hoc tests showed that mean R to R interval and HF power are significantly change...

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Study on the optimal order for the auto-regressive time-frequency analysis of heart rate variability

Cited by 23 publications

References 9 publications

Heart Rate Variability in Complex Regional Pain Syndrome during Rest and Mental and Orthostatic Stress

Heart Rate Variability in Complex Regional Pain Syndrome during Rest and Mental and Orthostatic Stress

An investigation on the influence of yogic methods on heart rate variability

Effects of radiation emitted from mobile phones on short- term heart rate variability parameters

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