Entropy of surface EMG reflects object weight in grasp-and-lift task

2017 ◽  
Author(s):  
Yuqi Li ◽  
Beth Jelfs ◽  
Rosa H.M. Chan
Keyword(s):  
Surface Emg ◽  
Object Weight ◽  
Lift Task

Probabilistic information on object weight shapes force dynamics in a grip-lift task

2015 ◽  
Vol 233 (6) ◽  
pp. 1711-1720 ◽  
Author(s):  
Leif Trampenau ◽  
Johann P. Kuhtz-Buschbeck ◽  
Thilo van Eimeren
Keyword(s):  
Force Dynamics ◽  
Probabilistic Information ◽  
Object Weight ◽  
Lift Task

Predictive force programming in the grip-lift task in stroke patients: the role of memory links between arbitrary cues and object weight

2009 ◽  
Vol 40 (01) ◽  
Author(s):  
D Bensmail ◽  
AS Sarfeld ◽  
F Kemper ◽  
H Karbe ◽  
G Fink ◽  
...  
Keyword(s):  
Stroke Patients ◽  
Object Weight ◽  
Lift Task

Predictive force programming in the grip-lift task: The role of memory links between arbitrary cues and object weight

2008 ◽  
Vol 46 (9) ◽  
pp. 2383-2388 ◽  
Author(s):  
Mitra Ameli ◽  
Manuel Dafotakis ◽  
Gereon R. Fink ◽  
Dennis A. Nowak
Keyword(s):  
Object Weight ◽  
Lift Task

Rectification of surface EMG impairs cortico-muscular coherence estimation

2011 ◽  
Vol 42 (01) ◽  
Author(s):  
Z. Bayraktaroglu ◽  
K. von Carlowitz-Ghori ◽  
F. Losch ◽  
G. Nolte ◽  
G. Curio ◽  
...  
Keyword(s):  
Surface Emg ◽  
Coherence Estimation

Kinematic Analysis of Biathlon Using Surface EMG : Case Study

2018 ◽  
Vol 27 (5) ◽  
pp. 1469-1476
Author(s):  
An-Sik Heo ◽  
Jung-Chul Lee ◽  
Jae-Young Park
Keyword(s):  
Kinematic Analysis ◽  
Surface Emg

scholarly journals Reliability of diaphragmatic motor-evoked potentials induced by transcranial magnetic stimulation

2020 ◽  
Vol 129 (6) ◽  
pp. 1393-1404
Author(s):  
Joseph F. Welch ◽  
Patrick J. Argento ◽  
Gordon S. Mitchell ◽  
Emily J. Fox
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Evoked Potentials ◽  
Magnetic Stimulation ◽  
Motor Evoked Potentials ◽  
Surface Emg ◽  
Noninvasive Technique ◽  
Large Variability ◽  
Adult Men ◽  
Latency Duration ◽  
Excellent Reproducibility

Transcranial magnetic stimulation (TMS) is a noninvasive technique to assess neural impulse conduction along the cortico-diaphragmatic pathway. The reliability of diaphragm motor-evoked potentials (MEP) induced by TMS is unknown. Notwithstanding large variability in MEP amplitude, we found good-to-excellent reproducibility of all MEP characteristics (latency, duration, amplitude, and area) both within- and between-day in healthy adult men and women. Our findings support the use of TMS and surface EMG to assess diaphragm activation in humans.

Amplitude cancellation reduces the size of motor unit potentials averaged from the surface EMG

2006 ◽  
Vol 100 (6) ◽  
pp. 1928-1937 ◽  
Author(s):  
Kevin G. Keenan ◽  
Dario Farina ◽  
Roberto Merletti ◽  
Roger M. Enoka
Keyword(s):  
Motor Unit ◽  
Conduction Velocity ◽  
Motor Units ◽  
Surface Emg ◽  
Excitation Level ◽  
Bipolar Electrode ◽  
Emg Signal ◽  
Motor Unit Synchronization ◽  
Rate Coding ◽  
Simulated Surface

The purpose of the study was to evaluate the influence of selected physiological parameters on amplitude cancellation in the simulated surface electromyogram (EMG) and the consequences for spike-triggered averages of motor unit potentials derived from the interference and rectified EMG signals. The surface EMG was simulated from prescribed recruitment and rate coding characteristics of a motor unit population. The potentials of the motor units were detected on the skin over a hand muscle with a bipolar electrode configuration. Averages derived from the EMG signal were generated using the discharge times for each of the 24 motor units with lowest recruitment thresholds from a population of 120 across three conditions: 1) excitation level; 2) motor unit conduction velocity; and 3) motor unit synchronization. The area of the surface-detected potential was compared with potentials averaged from the interference, rectified, and no-cancellation EMGs. The no-cancellation EMG comprised motor unit potentials that were rectified before they were summed, thereby preventing cancellation between the opposite phases of the potentials. The percent decrease in area of potentials extracted from the rectified EMG was linearly related to the amount of amplitude cancellation in the interference EMG signal, with the amount of cancellation influenced by variation in excitation level and motor unit conduction velocity. Motor unit synchronization increased potentials derived from both the rectified and interference EMG signals, although cancellation limited the increase in area for both potentials. These findings document the influence of amplitude cancellation on motor unit potentials averaged from the surface EMG and the consequences for using the procedure to characterize motor unit properties.

scholarly journals Association between Oxygen Consumption and Surface Electromyographic Amplitude and Its Variation within Individual Calf Muscles during Walking at Various Speeds

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1748
Author(s):  
Kohei Watanabe ◽  
Shideh Narouei
Keyword(s):  
Oxygen Consumption ◽  
Spatial Variation ◽  
Metabolic Response ◽  
Correlation Coefficients ◽  
Surface Emg ◽  
Medial Gastrocnemius ◽  
Whole Body ◽  
Young Males ◽  
Emg Amplitude ◽  
Calf Muscles

Surface electromyography (EMG) has been used to estimate muscle work and physiological burden of the whole body during human movements. However, there are spatial variations in surface EMG responses within individual muscles. The aim of this study was to investigate the relation between oxygen consumption and surface EMG responses of lower leg muscles during walking at various speeds and to quantify its spatial variation within an individual muscle. Nine young males walked on a treadmill at four speeds: preferred minus 1 km/h, preferred, preferred plus 1 km/h, and preferred plus 2 km/h, and the metabolic response was measured based on the expired gas. High-density surface EMG of the tibialis anterior (TA), medial gastrocnemius (MG), lateral gastrocnemius, and soleus muscles was performed using 64 two-dimensional electrode grids. Correlation coefficients between oxygen consumption and the surface EMG amplitude were calculated across the gait speeds for each channel in the electrode grid and for individual muscles. Mean correlation coefficients across electrodes were 0.69–0.87 for the four individual muscles, and the spatial variation of correlation between the surface EMG amplitude and oxygen consumption within an electrode grid was significantly greater in MG muscle than in TA muscle (Quartile deviations: 0.24 for MG and 0.02 for TA, p < 0.05). These results suggest that the physiological burden of the whole body during gait at various speeds can be estimated from the surface EMG amplitude of calf muscles, but we need to note its spatial distribution within the MG muscle.

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