{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T05:36:27Z","timestamp":1788932187857,"version":"build-2803163510"},"reference-count":18,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2014,5,6]],"date-time":"2014-05-06T00:00:00Z","timestamp":1399334400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2014,7]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p><jats:italic>Introduction<\/jats:italic>: We examined the etiology of the electromyographic (EMG) spectral shift during dynamic fatigue. <jats:italic>Methods<\/jats:italic>: Nineteen subjects (mean \u00b1 SD age = 22.4 \u00b1 1.6 years) performed 50 consecutive maximal concentric isokinetic contractions of dominant leg extensors. Surface EMG signals were detected from the vastus lateralis, rectus femoris, and vastus medialis during each contraction, processed with a wavelet analysis, and the resulting spectra were decomposed with a nonparametric spectral decomposition procedure. <jats:italic>Results<\/jats:italic>: The results indicated that the decreases in EMG frequency during the 50 contractions were generally due to reductions in high\u2010frequency power and increases in low\u2010frequency power. In addition, the spectral shifts were most pronounced for the rectus femoris, followed by the vastus lateralis, and then the vastus medialis. <jats:italic>Conclusions<\/jats:italic>: The spectral decomposition procedure is much more sensitive for tracking dynamic fatigue than is EMG mean frequency or median frequency. <jats:italic>Muscle Nerve<\/jats:italic> <jats:bold>50<\/jats:bold>: 95\u2013102, 2014<\/jats:p>","DOI":"10.1002\/mus.24098","type":"journal-article","created":{"date-parts":[[2013,10,12]],"date-time":"2013-10-12T15:04:42Z","timestamp":1381590282000},"page":"95-102","source":"Crossref","is-referenced-by-count":29,"title":["Shifts in EMG spectral power during fatiguing dynamic contractions"],"prefix":"10.1002","volume":"50","author":[{"given":"Travis W.","family":"Beck","sequence":"first","affiliation":[{"name":"University of Oklahoma Department of Health and Exercise Science 110 Huston Huffman Center Norman OK 73019\u20106081 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matt S.","family":"Stock","sequence":"additional","affiliation":[{"name":"Texas Tech University Department of Exercise and Sport Sciences Lubbock Texas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason M.","family":"Defreitas","sequence":"additional","affiliation":[{"name":"Oklahoma State University Department of Health, Leisure, and Human Performance Stillwater Oklahoma USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,5,6]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"crossref","first-page":"234","DOI":"10.1152\/ajplegacy.1923.65.2.234","article-title":"Electromyographic studies of muscular fatigue in man","volume":"65","author":"Cobb S","year":"1923","journal-title":"Am J Physiol"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/TBME.1979.326534"},{"key":"e_1_2_6_4_1","first-page":"341","article-title":"Muscular fatigue and action potential conduction velocity changes studied with frequency analysis of EMG signals","volume":"10","author":"Lindstrom L","year":"1970","journal-title":"Electromyography"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/PROC.1977.10544"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajplegacy.1970.219.5.1324"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1109\/10.930899"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1050-6411(00)00030-4"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jelekin.2005.07.004"},{"key":"e_1_2_6_10_1","volume-title":"SENIAM European recommendations for surface electromyography: results of the SENIAM project","author":"Hermens HJ","year":"1999"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1050-6411(02)00111-6"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1050-6411(02)00005-6"},{"key":"e_1_2_6_13_1","article-title":"Nonparametric decomposition of electromyographic wavelet spectra during concentric and eccentric muscle actions","author":"Beck TW","journal-title":"Clin Kinesiol"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1152\/japplphysiol.01070.2003"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-510X(73)90023-3"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jelekin.2010.06.007"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jelekin.2010.10.004"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jelekin.2010.10.005"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jelekin.2013.01.007"}],"container-title":["Muscle &amp; 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