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• W2116652913 abstract "In an experiment, we combined force plate measurements and surface EMG in studying quiet and perturbed standing, involving MS (Multiple sclerosis) and controls. The aim of this paper is to report the results thus obtained on the relation between filtered gastrocnemius (GA) EMG and the anterior-posterior center-of-pressure (A/P COP) coordinate. The main finding is the good correspondence between A/P COP and the filtered GA EMG in the low frequency range. The EMG envelope was calculated using a zero-lag filter. Combining this with time shifts around 250-350 ms produced a high correlation (85.5+/-8.4%) between the GA-EMG envelope and the A/P COP. This EMG-COP relation was closest when using a low cut-off frequency value around 1 Hz in calculating the EMG envelope. Based on this filtering procedure we estimated the average EMG-COP time shift to be 283+/-43 ms between the GA-EMG envelope and A/P COP (which lags behind EMG envelope). This shift is consistent with the 1 Hz cut-off and phase shift produced by a corresponding critically damped second-order filter, and is about twice the corresponding twitch time. These results suggest that GA is to a large extent responsible for the phasic control of the anterior-posterior balance during quiet standing. A small difference (p<0.03) was found between mean time shift thus obtained for controls (n=4) and MS (n=6) while sway area showed a major difference (p<0.01). The paper also compares three alternative filters for numerical calculation of the EMG-envelope." @default.
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• W2116652913 date "2007-10-01" @default.
• W2116652913 modified "2023-09-23" @default.
• W2116652913 title "Analyzing gastrocnemius EMG-activity and sway data from quiet and perturbed standing" @default.
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• W2116652913 doi "https://doi.org/10.1016/j.jelekin.2006.06.004" @default.
• W2116652913 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16890458" @default.
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