#Louis Brüls

[artthatgivesmefeelings]

Louis Joseph Brüls (German, 1803-1882) The Knight's Farewell, ca.1840

[itsmedicinesfakianakis]

Normalizing shoulder EMG: an optimal set of maximum isometric voluntary contraction tests considering reproducibility

Publication date: Available online 18 August 2017 Source:Journal of Electromyography and Kinesiology Author(s): Cédric Schwartz, François Tubez, François-Charles Wang, Jean-Louis Croisier, Olivier Brüls, Vincent Denoël, Bénédicte Forthomme Normalization of the electromyography (EMG) signal is often performed relatively to maximal voluntary activations (MVA) obtained during maximum isometric voluntary contraction (MVIC). The first aim was to provide an inter-session reproducible protocol to normalize the signal of eight shoulder muscles. The protocol should also lead to a level of activation >90% of MVA for >90% of the volunteers. The second aim was to evaluate the influence of the method used to extract the MVA from the EMG envelope on the normalized EMG signal. Thirteen volunteers performed 12 MVICs twice (one week interval). Several time constants (100 ms to 2 s) were compared when extracting the MVA from the EMG envelope. The EMG activity was also acquired during an arm elevation. Our results show that a combination of nine MVIC tests was required to meet our requirements including reproducibility. Both the number of MVIC tests and the size of the time constant influence the normalized EMG signal during the dynamic activity (variations up to 15%). A time constant of 1 s was a good compromise to extract the MVA. These findings are valuable to improve the reproducibility of EMG signal normalization. from # All Medicine by Alexandros G. Sfakianakis via alkiviadis.1961 on Inoreader http://ift.tt/2vTI0Ny

from OtoRhinoLaryngology - Alexandros G. Sfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2vTLa3S

[artthatgivesmefeelings]

Louis Joseph Brüls (German, 1803-1882) The Knight's Return, ca.1840

[artthatgivesmefeelings]

Louis Joseph Brüls (German, 1803-1882) The Knight’s Farewell, The Knight’s Return, ca.1840 Louis Joseph Brüls was born in Aachen and learnt to paint at the academy in Antwerp under W. Herreyns, one of the most famous narrative painters of his time. Brüls settled in Rome in 1837 and died there in 1882. The scenes in this pair of works are presumably intended to evoke the time of the crusades, which was a popular theme in Romantic painting.