scholarly journals Permanent Calibration in High Frequency Ratio (>0.3) Dynamic Unbalance Measurement

2012 ◽  
Vol 29 ◽  
pp. 4278-4281 ◽  
Author(s):  
Zhao Dingding ◽  
Cai Ping
Keyword(s):  
High Frequency ◽  
Frequency Ratio ◽  
Dynamic Unbalance

Effect of fingolimod on cardiac autonomic regulation in patients with multiple sclerosis

2015 ◽  
Vol 22 (8) ◽  
pp. 1080-1085 ◽  
Author(s):  
Sakari Simula ◽  
Tomi Laitinen ◽  
Tiina M Laitinen ◽  
Tuula Tarkiainen ◽  
Päivi Hartikainen ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
High Frequency ◽  
Frequency Ratio ◽  
Low Frequency ◽  
Autonomic Regulation ◽  
Rr Interval ◽  
Cardiac Autonomic Regulation ◽  
Multiple Sclerosis Patients

Background: Fingolimod modulates sphingosine-1-phosphate receptors that are also found in cardiovascular tissue. Objective: To investigate the effects of fingolimod on cardiac autonomic regulation prospectively. Methods: Twenty-seven relapsing–remitting multiple sclerosis patients underwent 24-hour electrocardiogram recording before, at the first day of fingolimod treatment (1d) and after three months of continuous dosing (3mo). The time interval between two consecutive R-peaks (RR-interval) was measured. Cardiac autonomic regulation was assessed by the various parameters of heart rate variability. Parasympathetic stimulation prolongs the RR-interval and increases heart rate variability while the effects of sympathetic stimulation are mainly the opposite. The low frequency/high frequency ratio reflects sympathovagal balance. Results: From baseline to 1d, a prolongation of the RR-interval ( P<0.001), an increase in the values of various heart rate variability parameters ( P<0.05 to P<0.001) and a decrease in the low frequency/high frequency ratio ( P<0.05) were demonstrated. At 3mo, although the RR-interval remained longer ( P<0.01), the values of various heart rate variability parameters were lower ( P<0.01 to P<0.001) as compared to baseline. At 3mo, the low frequency/high frequency ratio ( P<0.05) was higher in men than in women although no such difference was found at baseline or at 1d. Conclusions: After an initial increase in parasympathetic regulation, continuous fingolimod dosing shifts cardiac autonomic regulation towards sympathetic predominance, especially in men. Careful follow-up of fingolimod-treated relapsing–remitting multiple sclerosis patients is warranted as sympathetic predominance associates generally with impaired outcome. ClinicalTrials.cov: NCT01704183

scholarly journals Dual-Band Filtering Balanced-to-Unbalanced Impedance-Transforming Power Divider With High Frequency Ratio and Arbitrary Power Division

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 12710-12717 ◽  
Author(s):  
Zheng Zhuang ◽  
Yongle Wu ◽  
Mengdan Kong ◽  
Weimin Wang ◽  
Yuanan Liu
Keyword(s):  
High Frequency ◽  
Frequency Ratio ◽  
Power Divider ◽  
Dual Band ◽  
Arbitrary Power

scholarly journals Extreme prolongation of expiration breathing: Effects on electroencephalogram and autonomic nervous function

2018 ◽  
Vol 10 (2) ◽  
pp. 62-65
Author(s):  
Teruhisa Komori
Keyword(s):  
High Frequency ◽  
Frequency Ratio ◽  
Low Frequency ◽  
Frequency Component ◽  
Small Sample ◽  
High Frequency Component ◽  
Deep Breathing ◽  
Continuous Eeg ◽  
Nervous Function ◽  
Electrocardiogram Ecg

To clarify the physiological and psychological effects of deep breathing, the effects of extreme prolongation of expiration breathing (Okinaga) were investigated using electroencephalogram (EEG) and electrocardiogram (ECG). Participants were five male Okinaga practitioners in their 50s and 60s. Participants performed Okinaga for 31 minutes while continuous EEG and ECG measurements were taken. After 16 minutes of Okinaga, and until the end of the session, the percentages of theta and alpha 2 waves were significantly higher than at baseline. After 20 minutes, and until the end of the session, the percentage of beta waves was significantly lower than at baseline. The high frequency component of heart rate variability was significantly lower after 12 minutes of Okinaga and lasted until 23 minutes. The low frequency/high frequency ratio was significantly lower after 18 minutes of Okinaga and until the end of the session. Okinaga produced relaxation, suggesting that deep breathing may relieve anxiety. However, study limitations include potential ambiguity in the interpretation of the low frequency/high frequency ratio, the small sample, and the fact that EEG was measured only on the forehead.

scholarly journals Extreme prolongation of expiration breathing: Effects on electroencephalogram and autonomic nervous function

2018 ◽  
Vol 10 (2) ◽  
Author(s):  
Teruhisa Komori
Keyword(s):  
High Frequency ◽  
Frequency Ratio ◽  
Low Frequency ◽  
Frequency Component ◽  
Small Sample ◽  
High Frequency Component ◽  
Deep Breathing ◽  
Continuous Eeg ◽  
Nervous Function ◽  
Electrocardiogram Ecg

To clarify the physiological and psychological effects of deep breathing, the effects of extreme prolongation of expiration breathing (Okinaga) were investigated using electroencephalogram (EEG) and electrocardiogram (ECG). Participants were five male Okinaga practitioners in their 50s and 60s. Participants performed Okinaga for 31 minutes while continuous EEG and ECG measurements were taken. After 16 minutes of Okinaga, and until the end of the session, the percentages of theta and alpha 2 waves were significantly higher than at baseline. After 20 minutes, and until the end of the session, the percentage of beta waves was significantly lower than at baseline. The high frequency component of heart rate variability was significantly lower after 12 minutes of Okinaga and lasted until 23 minutes. The low frequency/high frequency ratio was significantly lower after 18 minutes of Okinaga and until the end of the session. Okinaga produced relaxation, suggesting that deep breathing may relieve anxiety. However, study limitations include potential ambiguity in the interpretation of the low frequency/high frequency ratio, the small sample, and the fact that EEG was measured only on the forehead.

Novel quad-band filter with high frequency ratio and controllable bandwidths using SLHSIRs and SLQSIRs

2014 ◽  
Vol 56 (12) ◽  
pp. 2845-2848 ◽  
Author(s):  
Zhi-chong Zhang ◽  
Qing-Xin Chu ◽  
Fu-Chang Chen
Keyword(s):  
High Frequency ◽  
Frequency Ratio ◽  
Band Filter

scholarly journals EVIDENCE FOR HIGH-FREQUENCY QPOs WITH A 3:2 FREQUENCY RATIO FROM A 5000 SOLAR MASS BLACK HOLE

2015 ◽  
Vol 811 (1) ◽  
pp. L11 ◽  
Author(s):  
Dheeraj R. Pasham ◽  
S. Bradley Cenko ◽  
Abderahmen Zoghbi ◽  
Richard F. Mushotzky ◽  
Jon Miller ◽  
...  
Keyword(s):  
Black Hole ◽  
High Frequency ◽  
Frequency Ratio ◽  
Solar Mass

Design of a biaxial high frequency-ratio low-g MEMS accelerometer

2018 ◽  
Vol 24 (9) ◽  
pp. 3851-3861 ◽  
Author(s):  
Xiaowei Shan ◽  
Jorge Angeles ◽  
James Richard Forbes
Keyword(s):  
High Frequency ◽  
Frequency Ratio ◽  
Mems Accelerometer

scholarly journals Potential value of the low frequency/high frequency ratio of heart rate variability to guide atrial fibrillation ablation procedures

EP Europace ◽  
2021 ◽  
Vol 23 (Supplement_3) ◽  
Author(s):  
JM Gregoire ◽  
C Gilon ◽  
J Hellinckx ◽  
S Carlier ◽  
H Bersini
Keyword(s):  
Atrial Fibrillation ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
High Frequency ◽  
Frequency Ratio ◽  
Low Frequency ◽  
Progressive Increase ◽  
Added Value ◽  
Clinical Criteria ◽  
Ganglionated Plexi

Abstract Funding Acknowledgements Type of funding sources: None. Background. The  differentiation  between  vagally  and  non-vagally mediated  atrial fibrillation (AF)  could be useful  to decide  adding  ganglionated  plexi  ablation  (GPA)  to  pulmonary vein isolation (PVI)  in  patients with vagally mediated  AF  onset. The role of the autonomic nervous system in triggering paroxysmal AF can be analyzed through heart rate variability (HRV) parameters. The low frequency/high frequency ratio (LF/HF) is used as an index of sympatho-vagal interaction. Based on clinical criteria, values of LF/HF &lt;1.5 are considered to reflect an increase of vagal modulation.  Purpose Identify  patients with paroxysmal AF who may benefit from GPA in addition to PVI, based on analysis of HRV parameters Material and methods From our database of unselected Holter recordings containing paroxysmal AF episodes, 199 analyzable AF onsets were labelled. We analyzed HRV frequential parameters by segments every 300 RR intervals to identify adrenergic and vagal onsets of AF episodes. We categorized AF onsets, depending of their respective values of LF/HF. We also checked the relationship of these parameters to heart rate (HR). We followed the evolution of the mean normalized values of LF/HF from the beginning of the recordings to the AF onsets (see figure). Results We found a progressive increase of LF/HF  in normalized units  (mean [95% confidence interval]) from  2.44  [2.12-2.76]  to 3.12  [2.85-3.39]  in the adrenergic group  (n = 113)  and a  progressive decrease of LF/HF from  1.51 [1.28-1.75]  to 1.02 [0.95-1.09]  in the  vagal group (n = 86). Differences between adrenergic and vagal AF were highly significant using Mann-Whitney test (p &lt; 0.001). A given patient shows the same type of AF in 80% of cases.  We found no correlation between frequential parameters and HR. Conclusions Our data show  potential  added value of  frequential  HRV  analysis  to  guide additional ganglionated  plexi ablation  to PVI. This  remains  to be demonstrated in a prospective study. The ratio LF/HF should be  considered  to optimize the decision-making process for  the ablation procedure. Abstract Figure. Frequential HRV parameters before AF

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