![]() ![]() Thus, the mathematical procedure for the extraction of muscle synergies through nonnegative matrix factorization (NMF) may be considered a reliable method to study muscle coordination adaptations from muscle strength programs.Įlectromyography muscle coordination neural adaptations reliability strength training. The present findings revealed that the muscle synergies extracted during the power clean remained stable across sets and days in unexperienced participants. Inter-day muscle synergy vectors had moderate similarity, while the variables regarding temporal activation were still strongly related. The coefficients of correlation of the muscle synergy vectors among the participants were 0.83 ± 0.08, 0.86 ± 0.09, and 0.66 ± 0. In this study, simulated muscle activation signals are produced by the combination of wavelets, similar to the real signals. Muscle weightings and activation coefficients of muscle synergies were first. Intra-day VAF, muscle synergy vectors, synergy activation coefficients and individual EMG profiles showed high similarity values. Synergy coefficients may convey information by means other than just reporting the most likely task given the muscle synergy activation pattern: for example, they can provide the information that some tasks are utterly unlikely based on the synergy activations (Quian Quiroga and Panzeri, 2009). The muscle synergy analysis is a muscle activation decomposition technique used in electromyogram signals. FigUre 2 Block diagram to estimate action direction of a muscle synergy. Three muscle synergies accounted for almost 90% of variance accounted for (VAF) across sets and days. Twelve unexperienced participants performed four sets of power cleans in two test days after strength tests, and muscle synergies were extracted from electromyography (EMG) data of 16 muscles. This feature of activation coefficients might be related to the abnormal. There were more peaks in the activation coefficient curve, especially during the HRI with counterclockwise circle-drawing movements. Therefore, the aim of the study was to evaluate intra- and inter-day reliability of a strength training complex task, the power clean, assessing participants' variability in the task across sets and days. The activation coefficients of muscle synergy for stroke patients were also found to be different when compared with the healthy subjects. The reliability of the method has been proposed, although it has not been assessed previously during a complex sportive task. Muscle synergy extraction has been utilized to investigate muscle coordination in human movement, namely in sports. ![]()
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