https://scholars.lib.ntu.edu.tw/handle/123456789/505378
標題: | A Novel Method for Measuring Electromechanical Delay of the Vastus Medialis Obliquus and Vastus Lateralis | 作者: | Chen H.-Y. JIANN-JONG LIAU Wang C.-L. Lai H.-J. Jan M.-H. |
公開日期: | 2009 | 卷: | 35 | 期: | 1 | 起(迄)頁: | 14-20 | 來源出版物: | Ultrasound in Medicine and Biology | 摘要: | Electromechanical delay (EMD) of the vastus medialis obliquus (VMO) and vastus lateralis (VL) is determined by measuring the interval between the time of onset of muscle activities and the time of onset of mechanical output. However, individual mechanical output of the VMO or the VL cannot be obtained with the conventional method because of the knee extension force as the mechanical output. Therefore, the objective of the present study was to develop a new method for measuring EMD of the VMO and VL individually. Twelve healthy volunteers participated in the experiment. The motor point of the target muscle was electrically stimulated to evoke a muscle twitch. Simultaneously, the electrical stimulation signal was transmitted to ultrasound apparatus via the electrocardiography input channel. The ultrasound apparatus was used to capture the patellar movement elicited by the muscle twitch. EMD was measured from the onset of the electrical stimulation to the onset of patellar movement. The results showed that the intraclass correlation coefficients for the reproducibility of the EMD measurements of the VMO and VL were greater than 0.8. The EMDs of the VMO and VL were 18.3 ± 2.2 ms and 24.8 ± 5.8 ms, respectively. This new method provides a more precise measurement of EMD in the VMO and VL than does the conventional method because of the use of patellar movement as the mechanical output. (E-mail: mhjan@ntu.edu.tw). ? 2008 World Federation for Ultrasound in Medicine & Biology. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-57249094321&doi=10.1016%2fj.ultrasmedbio.2008.06.011&partnerID=40&md5=41c0942ef69cdacaceb78cccf53d22e7 https://scholars.lib.ntu.edu.tw/handle/123456789/505378 |
ISSN: | 0301-5629 | DOI: | 10.1016/j.ultrasmedbio.2008.06.011 | SDG/關鍵字: | Acoustic waves; Correlation methods; Ultrasonic imaging; Ultrasonics; Ultrasonography; Conventional methods; Electrical stimulation; Electrical stimulations; Input channels; Intraclass correlation coefficients; Knee extensions; Muscle activities; Novel methods; Patellar movement; Precise measurements; Reproducibility; Vastus medialis; Muscle; adult; analysis of variance; article; clinical article; correlation coefficient; echography; electrocardiography monitoring; electromechanical delay; electrostimulation; excitation contraction coupling; female; human; human experiment; in vivo study; informed consent; knee function; male; muscle contractility; muscle contraction; muscle excitation; muscle twitch; myotatic reflex; normal human; priority journal; vastus lateralis muscle; vastus medialis muscle; Adult; Electric Stimulation; Electromyography; Female; Humans; Image Interpretation, Computer-Assisted; Male; Movement; Patella; Quadriceps Muscle; Sensitivity and Specificity; Time Factors |
顯示於: | 物理治療學系所 |
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