Comparison of decomposition algorithms for identification of single motor units in ultrafast ultrasound image sequences of low force voluntary skeletal muscle contractions

Originally included in thesis in manuscript form with titel: "Comparison of decomposition algorithms for identification of single motor units in ultrafast ultrasound image sequences of voluntary skeletal muscle contractions"
Objective: In this study, the aim was to compare the performance of four spatiotemporal decomposition algorithms (stICA, stJADE, stSOBI, and sPCA) and parameters for identifying single motor units in human skeletal muscle under voluntary isometric contractions in ultrafast ultrasound image sequences as an extension of a previous study. The performance was quantifed using two measures: (1) the similarity of components’ temporal characteristics against gold standard needle electromyography recordings and (2) the agreement of detected sets of components between the diferent algorithms.Results: We found that out of these four algorithms, no algorithm signifcantly improved the motor unit identifcation success compared to stICA using spatial information, which was the best together with stSOBI using either spatialor temporal information. Moreover, there was a strong agreement of detected sets of components between the different algorithms. However, stJADE (using temporal information) provided with complementary successful detections. These results suggest that the choice of decomposition algorithm is not critical, but there may be a methodological improvement potential to detect more motor units

MEDICIN OCH HÄLSOVETENSKAP Medicinska och farmaceutiska grundvetenskaper Fysiologi hsv//swe
MEDICAL AND HEALTH SCIENCES Basic Medicine Physiology hsv//eng
Ultrafast ultrasound; Concentric needle electromyography; Motor units; Decomposition algorithms; Blind source separation

Yu, Jun,1962-Umeå universitet,Institutionen för matematik och matematisk statistik(Swepub:umu)juyu0002 (author)
Grönlund, ChristerUmeå universitet,Radiofysik(Swepub:umu)chgr0009 (author)
Umeå universitetRadiofysik (creator_code:org_t)

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Physiology

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