Reliability And Precision In Electromyographic Median Power Frequency Of Shoulder Muscles During Running

Background Dynamic action of anesthetic agents was compared at cortical and subcortical levels during induction of anesthesia. Unconsciousness involved the cortical brain but suppression of movement in response to noxious stimuli was mediated through subcortical structures. Methods Twenty-five patients with Parkinson disease, previously implanted with a deep-brain stimulation electrode, were enrolled during the implantation of the definitive pulse generator. During induction of anesthesia with propofol (n = 13) or sevoflurane (n = 12) alone, cortical (EEG) and subcortical (ESCoG) electrogenesis were obtained, respectively, from a frontal montage (F3-C3) and through the deep-brain electrode (p0-p3). In EEG and ESCoG spectral analysis, spectral edge (90%) frequency, median power frequency, and nonlinear analysis dimensional activation calculations were determined. Results Sevoflurane and propofol decreased EEG and ESCoG activity in a dose-related fashion. EEG values decreased dramatically at loss of consciousness, whereas there was little change in ESCoG values. Quantitative parameters derived from EEG but not from ESCoG were able to predict consciousness versus unconsciousness. Conversely, quantitative parameters derived from ESCoG but not from EEG were able to predict movement in response to laryngoscopy. Conclusion These data suggest that in humans, unconsciousness mainly involves the cortical brain, but that suppression of movement in response to noxious stimuli is mediated through the effect of anesthetic agents on subcortical structures.

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Quantitative Analysis of EEG Power Spectrum and EMG Median Power Frequency Changes after Continuous Passive Motion Mirror Therapy System

Sensors ◽

10.3390/s20082354 ◽

2020 ◽

Vol 20 (8) ◽

pp. 2354

Author(s):

Taewoong Park ◽

Mina Lee ◽

Taejong Jeong ◽

Yong-Il Shin ◽

Sung-Min Park

Keyword(s):

Muscle Fatigue ◽

Brain Activation ◽

Sensory Stimulation ◽

Continuous Passive Motion ◽

Mu Rhythm ◽

Mirror Therapy ◽

Action Execution ◽

Passive Motion ◽

Power Frequency ◽

Median Power Frequency

Robotic mirror therapy (MT), which allows movement of the affected limb, is proposed as a more effective method than conventional MT (CMT). To improve the rehabilitation effectiveness of post-stroke patients, we developed a sensory stimulation-based continuous passive motion (CPM)-MT system with two different operating protocols, that is, asynchronous and synchronous modes. To evaluate their effectiveness, we measured brain activation through relative and absolute power spectral density (PSD) changes of electroencephalogram (EEG) mu rhythm in three cases with CMT and CPM-MT with asynchronous and synchronous modes. We also monitored changes in muscle fatigue, which is one of the negative effects of the CPM device, based on median power frequency (MPF) and root mean square (RMS). Relative PSD was most suppressed when subjects used the CPM-MT system under synchronous control: 22.11%, 15.31%, and 16.48% on Cz, C3, and C4, respectively. The absolute average changes in MPF and RMS were 1.59% and 9.78%, respectively, with CPM-MT. Synchronous mode CPM-MT is the most effective method for brain activation, and muscle fatigue caused by the CPM-MT system was negligible. This study suggests the more effective combination rehabilitation system for MT by utilizing CPM and magnetic-based MT task to add action execution and sensory stimulation compared with CMT.

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Evaluation of integral electromyographic values and median power frequency values in women with myogenous temporomandibular disorder and asymptomatic controls

Journal of Bodywork and Movement Therapies ◽

10.1016/j.jbmt.2017.09.001 ◽

2018 ◽

Vol 22 (3) ◽

pp. 720-726 ◽

Cited By ~ 3

Author(s):

Paulo Fernandes Pires ◽

Delaine Rodrigues-Bigaton

Keyword(s):

Temporomandibular Disorder ◽

Power Frequency ◽

Median Power Frequency

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Neural inhibition during maximal eccentric and concentric quadriceps contraction: effects of resistance training

Journal of Applied Physiology ◽

10.1152/jappl.2000.89.6.2249 ◽

2000 ◽

Vol 89 (6) ◽

pp. 2249-2257 ◽

Cited By ~ 214

Author(s):

P. Aagaard ◽

E. B. Simonsen ◽

J. L. Andersen ◽

S. P. Magnusson ◽

J. Halkjær-Kristensen ◽

...

Keyword(s):

Resistance Training ◽

Vastus Lateralis ◽

Rectus Femoris ◽

Quadriceps Strength ◽

Electromyographic Activity ◽

Neuromuscular Activation ◽

Concentric Contractions ◽

Power Frequency ◽

Heavy Resistance Training ◽

Median Power Frequency

Despite full voluntary effort, neuromuscular activation of the quadriceps femoris muscle appears inhibited during slow concentric and eccentric contractions. Our aim was to compare neuromuscular activation during maximal voluntary concentric and eccentric quadriceps contractions, hypothesizing that inhibition of neuromuscular activation diminishes with resistance training. In 15 men, pretraining electromyographic activity of the quadriceps muscles [vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF)] was 17–36% lower during slow and fast (30 and 240°/s) eccentric and slow concentric contractions compared with fast concentric contractions. After 14 wk of heavy resistance training, neuromuscular inhibition was reduced for VL and VM and was completely removed for RF. Concurrently, electromyographic activity increased 21–52, 22–29, and 16–32% for VL, VM, and RF, respectively. In addition, median power frequency decreased for VL and RF. Eccentric quadriceps strength increased 15–17%, whereas slow and fast concentric strength increased 15 and 8%, respectively. Pre- and posttraining median power frequency did not differ between eccentric and concentric contractions. In conclusion, quadriceps motoneuron activation was lower during maximal voluntary eccentric and slow concentric contractions compared with during fast concentric contraction in untrained subjects, and, after heavy resistance training, this inhibition in neuromuscular activation was reduced.

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Sex differences in surface EMG interference pattern power spectrum

Journal of Applied Physiology ◽

10.1152/jappl.1994.77.5.2163 ◽

1994 ◽

Vol 77 (5) ◽

pp. 2163-2168 ◽

Cited By ~ 18

Author(s):

R. Cioni ◽

F. Giannini ◽

C. Paradiso ◽

N. Battistini ◽

C. Navona ◽

...

Keyword(s):

Sex Differences ◽

Power Spectrum ◽

Surface Emg ◽

Progressive Increase ◽

Experimental Conditions ◽

Spectral Parameters ◽

Mean Values ◽

Healthy Female ◽

Power Frequency ◽

Median Power Frequency

Sex differences in the spectral parameters of the surface electromyogram (EMG) power spectrum were studied during voluntary muscle contractions of different strength with rest in between. The influence of two different types of leads (unipolar and bipolar) on the values of the spectral parameters was also investigated under the same experimental conditions. The subjects were 15 healthy female and 15 healthy male volunteers. The relationship between the amplitude (root mean square) of the EMG and the force developed was not linear. The mean values of the median power frequency were lower in women than in men. With both types of lead, the increase in force was accompanied by a progressive increase in median power frequency in male and female subjects. The significant differences in spectral parameters observed in the two sexes are probably correlated with anatomic differences.

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Surgical Stimulation Shifts EEG Concentration–Response Relationship of Desflurane

Anesthesiology ◽

10.1097/00000542-200103000-00006 ◽

2001 ◽

Vol 94 (3) ◽

pp. 390-399 ◽

Cited By ~ 45

Author(s):

Heiko Röpcke ◽

Benno Rehberg ◽

Michael Koenen-Bergmann ◽

Thomas Bouillon ◽

Jörgen Bruhn ◽

...

Keyword(s):

Bispectral Index ◽

Volatile Anesthetic ◽

Pharmacodynamic Modeling ◽

Control Group ◽

Spectral Edge Frequency ◽

Spectral Edge ◽

Desflurane Concentration ◽

Power Frequency ◽

Median Power Frequency ◽

Surgical Stimulation

Background Anesthesiologists routinely increase the delivered anesthetic concentration before surgical stimulation in anticipation of increased anesthetic requirement to achieve certain goals (e.g., amnesia, unconsciousness, and immobility). Electroencephalographic monitoring is one method of determining indirectly anesthetic effect on the brain. The present study investigated the effect of surgical stimuli on the concentration-response relation of desflurane-induced electroencephalographic changes. Methods The electroencephalographic activity was recorded from 24 female patients who received only desflurane after a single induction dose of propofol. Twelve patients served as a control group before surgical stimulation. The other 12 patients, all undergoing lower abdominal surgery, were investigated between opening and closure of the peritoneum. Desflurane vaporizer settings were randomly increased and decreased between 0.5 and 1.6 minimum alveolar concentration as long as anesthesia was considered adequate. Spectral edge frequency 95, median power frequency, and Bispectral Index were calculated. Desflurane effect-site concentrations and the concentration-effect curves for spectral edge frequency 95, median power frequency, and Bispectral Index were determined by simultaneous pharmacokinetic and pharmacodynamic modeling. Results Surgical stimulation shifted the desflurane concentration-electroencephalographic effect curves for spectral edge frequency 95, median power frequency, and Bispectral Index toward higher desflurane concentrations. In the unstimulated group, 2.2 +/- 0.74 vol% desflurane were necessary to achieve a Bispectral Index of 50, whereas during surgery, 6.8 +/- 0.98 vol% (mean +/- SE) were required. Conclusions During surgery, higher concentrations of the volatile anesthetic are required to achieve a desired level of cortical electrical activity and, presumably, anesthesia.

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