| Mechanical, biochemical, and electromyographic responses to short-term eccentric-concentric knee extensor training in humans. | |
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MedLine Citation:
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PMID: 20651608 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Váczi, M, Tihanyi, J, Hortobágyi, T, Rácz, L, Csende, Z, Costa, A, and Pucsok, J. Mechanical, biochemical, and electromyographic responses to short-term eccentric-concentric knee extensor training in humans. J Strength Cond Res 25(4): 922-932, 2011-This study examined the effects of short-term eccentric-concentric knee extensor training on mechanical and biochemical variables, myoelectric activity, and muscle soreness. Seventeen men were assigned to either experimental (E, n = 10) or control group (C, n = 7). Group E performed 90 maximal isokinetic eccentric-concentric knee extensor contractions on each of 3 consecutive days (Tr1-Tr3) followed by 1-day rest, and then on 4 more consecutive days (Tr4-Tr7). Peak eccentric torque of each contraction during the training was recorded and averaged for each session (MTr). Maximal isometric torque (M0), eccentric torque (Mecc), integrated electromyography (iEMG), plasma creatine kinase (CK), and lactate dehydrogenase (LDH) activities were measured before, immediately, 24, 48, and 72 hours after Tr1, at 1 and 3 days after Tr7. Group C did not train but performed all exercise tests; CK and LDH were measured at 3 time points only. Acutely, M0 and Mecc decreased and CK, LDH, and soreness increased more in E than in C 24 hours after Tr1. Chronically, MTr and M0 increased more in E than C by Tr7 and CK, LDH, and muscle soreness gradually decreased by Tr7 whereas iEMG increased more in E than in C after Tr3 through Tr7. High-intensity short-term eccentric-concentric knee extensor exercise training produced immediate reductions in maximal voluntary force. Most likely neural adaptations contributed to rapid recovery and strength adaptations because maximal voluntary force increased by the end of the training protocol in previously trained healthy adults. |
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Authors:
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Márk Váczi; József Tihanyi; Tibor Hortobágyi; Levente Rácz; Zsolt Csende; Andreas Costa; József Pucsok |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 25 ISSN: 1533-4287 ISO Abbreviation: J Strength Cond Res Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-03-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: United States |
Other Details:
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Languages: eng Pagination: 922-32 Citation Subset: IM |
Affiliation:
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1Biomechanics Laboratory, Department of Biomechanics, Semmelweis University, Faculty of Physical Education and Sport Science, Budapest, Hungary; 2Biomechanics Laboratory, East Carolina University, Greenville, North Carolina; and 3Research Institute, National Institute for Sport Medicine, Budapest, Hungary. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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