scholarly journals Changes in Electroencephalography by Modulation of Interferential Current Stimulation

2020 ◽  
Vol 10 (17) ◽  
pp. 6028
Author(s):  
Sung-Hyoun Cho ◽  
Seon-Chil Kim
Keyword(s):  
Young Adults ◽  
Cerebral Cortex ◽  
High Frequency ◽  
Pain Perception ◽  
Low Frequency ◽  
Low Intensity ◽  
Stimulation Parameters ◽  
Stimulation Level ◽  
Beta Power ◽  
Interferential Current

Interferential current (IFC) stimulation can alter pain perception. This study aimed to investigate the effects of IFC stimulation on motor cortex signals and observe how electroencephalography changes depend on IFC stimulation parameters. Forty-five healthy adults were divided into high frequency (HF)–low intensity (LI), HF–high intensity (HI), and low frequency (LF)–HI groups to compare their electroencephalography before, immediately after, and 30 min after current stimulation. The changes in relative beta power according to the intervention time showed significant differences between the HF–LI and HF–HI, as well as the LF–HI and HF–HI, groups in the C3 and P3 regions immediately after IFC stimulation. Similarly, the gamma band showed significant differences according to the intervention time between the LF–HI and HF–HI groups in the P3 region immediately following IFC intervention. For relative theta power, the interaction between group and time was significantly different in the Fp2, F3, F4, C3, C4, and P4 regions. Based on these results, we were able to map the activation in cerebral cortex regions according to the stimulation level, confirming changes in electroencephalogram activation through peripheral nerve stimulation. This study provides a foundation for future applications for selectively controlling feedback at a proper stimulation level in young adults.

A Comparison of the Electroencephalogram between Institutionalized and Community Children in Romania

2004 ◽  
Vol 16 (8) ◽  
pp. 1327-1338 ◽  
Author(s):  
Peter J. Marshall ◽  
Nathan A. Fox ◽  
BEIP Core Group
Keyword(s):  
High Frequency ◽  
Local Community ◽  
System Development ◽  
Low Frequency ◽  
Nervous System Development ◽  
Learning Disorders ◽  
Temporal Region ◽  
Beta Power ◽  
Eeg Data ◽  
Infants And Young Children

Electroencephalographic (EEG) data were collected from a sample of institutionalized infants and young children in Bucharest, Romania, and were compared with EEG data from age-matched children from the local community who had never been institutionalized and who were living with their families in the Bucharest area. Compared with the never-institutionalized group, the institutionalized group showed a pattern of increased low-frequency (theta) power in posterior scalp regions and decreased high-frequency (alpha and beta) power, particularly at frontal and temporal electrode sites. This finding is consistent with EEG studies of children facing environmental adversity and children with learning disorders. The institutionalized group also showed less marked hemispheric EEG asymmetries than the never-institutionalized group, particularly in the temporal region. The results are discussed in the context of two models: that the pattern of EEG in the institutionalized children reflects a maturational lag in nervous system development, or that it reflects tonic cortical hypoactivation.

Topographic Electroencephalographic Study with Power Ratio Index Mapping in Patients with Malignant Brain Tumors

Neurosurgery ◽  
1985 ◽  
Vol 17 (4) ◽  
pp. 613-619 ◽  
Author(s):  
Ken Nagata ◽  
Cordell E. Gross ◽  
Glenn W. Kindt ◽  
J. Michael Geier ◽  
Geoffrey R. Adey
Keyword(s):  
Brain Tumors ◽  
High Frequency ◽  
Low Frequency ◽  
Power Ratio ◽  
Malignant Brain Tumors ◽  
Power Spectral ◽  
Beta Power ◽  
Index Mapping ◽  
Low Frequency Power ◽  
Frequency Power

Abstract A variant of electroencephalogram (EEG) power spectral mapping called power ratio index (PRI) mapping was used to monitor 15 patients with malignant brain tumors. This index is generated by dividing the low frequency (delta, theta) power by the high frequency (alpha, beta) power. Because the nonparoxysmal effect of a brain tumor on the EEG is reflected as a relative loss of high frequency power and a gain in low frequency power, utilization of the PRI has the effect of placing the epicenter of the “power dysfunction” coincident with the epicenter of the tumor.

THE EFFECT OF HIGH AND LOW FREQUENCY CORTICAL STIMULATION WITH A FIXED OR A POISSON DISTRIBUTED INTERPULSE INTERVAL ON CORTICAL EXCITABILITY IN RATS

2014 ◽  
Vol 24 (02) ◽  
pp. 1430005 ◽  
Author(s):  
INE BUFFEL ◽  
ALFRED MEURS ◽  
ROBRECHT RAEDT ◽  
VEERLE DE HERDT ◽  
LEEN DECORTE ◽  
...  
Keyword(s):  
High Frequency ◽  
Refractory Epilepsy ◽  
Cortical Excitability ◽  
Low Frequency ◽  
Cortical Stimulation ◽  
Interpulse Interval ◽  
Motor Cortex Stimulation ◽  
Low Intensity ◽  
Promising Treatment ◽  
Neocortical Epilepsy

Neurostimulation is a promising treatment for refractory epilepsy. We studied the effect of cortical stimulation with different parameters in the rat motor cortex stimulation model. High intensity simulation (threshold for motor response - 100 μA), high frequency (130 Hz) stimulation during 1 h decreased cortical excitability, irrespective of the interpulse interval used (fixed or Poisson distributed). Low intensity (10 μA) and/or low frequency (5 Hz) stimulation had no effect. Cortical stimulation appears promising for the treatment of neocortical epilepsy if frequency and intensity are high enough.

Nerve-induced nonadrenergic vasoconstriction and vasodilatation in skeletal muscle

1990 ◽  
Vol 258 (5) ◽  
pp. H1334-H1338 ◽  
Author(s):  
A. Ohlen ◽  
M. G. Persson ◽  
L. Lindbom ◽  
L. E. Gustafsson ◽  
P. Hedqvist
Keyword(s):  
High Frequency ◽  
Motor Nerve ◽  
Low Frequency ◽  
High Frequency Stimulation ◽  
Alpha Adrenoceptor ◽  
Adrenoceptor Antagonist ◽  
Stimulation Parameters ◽  
Low Frequency Stimulation ◽  
Frequency Stimulation ◽  
Stimulation Of

Intravital microscopy was used to study the effect of motor nerve stimulation on microvessel diameters in the rabbit tenuissimus muscle. Stimulation of the motor nerve (0.5-5 ms, 2-20 Hz, 5-15 V) evoked pulse duration- and frequency-dependent constriction of transverse and terminal arterioles. The vasoconstriction induced by low-frequency stimulation (2 Hz) was abolished by the alpha-adrenoceptor antagonist phentolamine, whereas high-frequency stimulation (10-20 Hz) resulted in a response that was only partially inhibited by phentolamine. However, desensitization of the tissue to the vasoconstrictor effects of neuropeptide Y (NPY) changed the response remaining after phentolamine into vasodilatation. Independent of stimulation parameters, pretreatment of the tissue with the adrenergic neuron blocker guanethidine reversed the constriction into dilatation that was resistant to propranolol, atropine, and indomethacin. The results document the functional presence of both vasoconstrictor and vasodilator fibers in the rabbit tenuissimus muscle motor nerve, and they suggest that part of the nerve-induced vasoconstriction at higher stimulation frequencies is caused by neuronally released NPY.

scholarly journals Sound Performances of Partition Board from Waste Materials

2021 ◽  
Vol 920 (1) ◽  
pp. 012011
Author(s):  
U Kassim ◽  
S A Nur ◽  
M N Kamarudin ◽  
M A Rahim
Keyword(s):  
Noise Reduction ◽  
High Intensity ◽  
High Frequency ◽  
Low Frequency ◽  
Test Point ◽  
Sound Level ◽  
Waste Materials ◽  
Horizontal Line ◽  
Low Intensity ◽  
Reduction Coefficient

Abstract This study is on the sound performances of a selected number of partition boards in Industrialised Building System (IBS) buildings. The proposed bespoke board were made from squandered or waste materials, namely, coconut shells and newspapers. Each board had been tested for six different distances from the speaker in four different levels of sound, changing the level of the sound frequency. Thereon, the results were analysed. The average result of each board with various distances from the sound source, starting from 0 cm to 220 cm, was combined into under one sound level. The percentage of the noise reduction coefficient is designated by the vertical line whereas the levels of the sound is designated by the horizontal line. Point 1 stands for the low frequency and low intensity test. Point 2 stands for low frequency and high intensity test. The board that is being made of 80% coconut shell, 15% cement and 5% newspaper has an average of noise reduction coefficient of 0.21 in low frequency and low intensity, 0.21 in low frequency and high intensity, 0.24 in high frequency, high intensity and 0.12 in high frequency low intensity.

Relationship between Malocclusion and Heart Rate Variability Indices in Young Adults

2011 ◽  
Vol 50 (04) ◽  
pp. 358-363 ◽  
Author(s):  
N. Takeuchi ◽  
M. Furuta ◽  
T. Tomofuji ◽  
M. Morita ◽  
D. Ekuni
Keyword(s):  
Quality Of Life ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Young Adults ◽  
Chronic Stress ◽  
High Frequency ◽  
Low Frequency ◽  
The Relationship ◽  
Oral Impacts

Summary Objectives: Heart rate variability (HRV) has been used to assess sympathetic and parasympathetic modulation of heart rate. Chronic stress relates to reduced HRV. Malocclusion has effects on quality of life, which can lead to chronic stress. Therefore, we hypothesized that malocclusion, as chronic stress, may contribute to reduced HRV. The aim of this study was to investigate the relationship between malocclusion and HRV indices in healthy young adults. Methods: Thirty-seven non-smoking healthy subjects, aged 22 to 25 years, were examined. Malocclusion was defined by Angle classification. HRV indices included root mean square of successive differences, low frequency (LF), high frequency (HF) and ratio of LF to HF. The effects of malocclusion on quality of life and mental health were assessed using self-reported questionnaires, the condition-specific Oral Impacts on Daily Performances index (CS-OIDP) and the Hopkins Symptoms Checklist (HSCL), respectively. Results: Significantly lower score of HF and higher heart rate (HR) level and CS-OIDP score were observed in subjects with malocclusion (n = 17) compared to those in the control subjects (n = 20) (P < 0.05). There was a positive correlation between HR and score of “anxiety” in HSCL (P < 0.05). Conclusions: The data showed an association between malocclusion and lower HRV. Based on our results, orthodontic treatment might contribute not only to improvement of oral esthetic and functional problems but also to improvement of stress and HRV indices.

scholarly journals Ultrassom terapêutico para cicatrização de feridas: revisão sistemática

2017 ◽  
Vol 15 (3) ◽  
pp. 518-529
Author(s):  
Raciele Ivandra Guarda Korelo ◽  
Luiz Claudio Fernandes
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
High Frequency Ultrasound ◽  
Pulsed Ultrasound ◽  
Low Intensity Pulsed Ultrasound ◽  
Low Intensity ◽  
Low Frequency Ultrasound ◽  
Frequency Ultrasound

Introdução: o uso do ultrassom terapêutico (UST) para cicatrização de feridas ainda é discutido pela comunidade científica. Objetivo: determinar se o UST produz desfechos benéficos na cicatrização de feridas e quais tem sido os parâmetros utilizados para proporcionar melhor dose-resposta. Métodos: Foram pesquisadas as bases de dados PubMEd, SciELO e PEDro. Foram selecionados 19 ensaios clínicos, avaliados pelas escalas PEDro e JADAD. Resultados: dos 19 estudos, 8 relacionaram-se à aplicação do NCLFU (Noncontact Low Frequency Ultrasound) com evidência moderada para sua aplicação, 6 à aplicação do HFU (High Frequency Ultrasound) e 1 à aplicação de LIPUS (Low Intensity Pulsed Ultrasound), ambos com baixa evidência. Quanto a relação dose-resposta, não há concordância entre os estudos desta revisão. Conclusões: existe evidência moderada da NCLFU e limitada da HFU como recurso adjuvante para o tratamento de feridas, não sendo possível responder com clareza a melhor relação dose-resposta.

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