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https://hdl.handle.net/2440/52144
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dc.contributor.author | Dartnall, T. | - |
dc.contributor.author | Nordstrom, M. | - |
dc.contributor.author | Semmler, J. | - |
dc.date.issued | 2008 | - |
dc.identifier.citation | Journal of Neurophysiology, 2008; 99(2):1008-1019 | - |
dc.identifier.issn | 0022-3077 | - |
dc.identifier.issn | 1522-1598 | - |
dc.identifier.uri | http://hdl.handle.net/2440/52144 | - |
dc.description.abstract | The purpose of this study was to determine the effect of eccentric exercise on correlated motor unit discharge (motor unit synchronization and coherence) during low-force contractions of the human biceps brachii muscle. Eight subjects (age, 25 ± 7 yr) performed three tasks involving isometric contraction of elbow flexors while EMG (surface and intramuscular) records were obtained from biceps brachii. Tasks were 1) maximum voluntary contraction (MVC); 2) constant-force contraction at various submaximal targets; and 3) sustained discharge of pairs of concurrently active motor units for 2–5 min. These tasks were performed before, immediately after, and 24 h after fatiguing eccentric exercise. MVC force declined 46% immediately after eccentric exercise and remained depressed (31%) 24 h later, which is indicative of muscle damage. For the constant-force task, biceps brachii EMG (~100% greater) and force fluctuations (~75% greater) increased immediately after exercise, and both recovered by ~50% 24 h later. Motor unit synchronization, quantified by cross-correlation of motor unit pairs during low-force (1–26% MVC) contractions, was 30% greater immediately after (n = 105 pairs) and 24 h after exercise (n = 92 pairs) compared with before exercise (n = 99 pairs). Similarly, motor unit coherence at low (0–10 Hz) frequencies was 20% greater immediately after exercise and 34% greater 24 h later. These results indicate that the series of events leading to muscle damage from eccentric exercise alters the correlated behavior of human motor units in biceps brachii muscle for ≥24 h after the exercise. | - |
dc.description.statementofresponsibility | Tamara J. Dartnall, Michael A. Nordstrom and John G. Semmler | - |
dc.language.iso | en | - |
dc.publisher | Amer Physiological Soc | - |
dc.source.uri | http://dx.doi.org/10.1152/jn.00686.2007 | - |
dc.subject | Elbow | - |
dc.subject | Muscle, Skeletal | - |
dc.subject | Motor Neurons | - |
dc.subject | Brachial Plexus | - |
dc.subject | Humans | - |
dc.subject | Electromyography | - |
dc.subject | Exercise | - |
dc.subject | Analysis of Variance | - |
dc.subject | Task Performance and Analysis | - |
dc.subject | Muscle Contraction | - |
dc.subject | Time Factors | - |
dc.subject | Adolescent | - |
dc.subject | Adult | - |
dc.subject | Female | - |
dc.subject | Male | - |
dc.subject | Biomechanical Phenomena | - |
dc.title | Motor Unit Synchronization is Increased in Biceps Brachii after Exercise-Induced Damage to Elbow Flexor Muscles | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1152/jn.00686.2007 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Semmler, J. [0000-0003-0260-8047] | - |
Appears in Collections: | Aurora harvest 5 Physiology publications |
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