Coactivation does not contribute to fatigue-induced decreases in torque during reciprocal, isokinetic muscle actions.
BACKGROUND: Studies of coactivation have typically utilized single movement isometric or isokinetic fatiguing muscle actions. OBJECTIVE: The purpose of the current study was to examine coactivation of the biceps brachii (BB) and triceps brachii (TB) in response to a maximal, reciprocal, isokinetic f...
| Publicado en: | Isokinetics & Exercise Science Vol. 30; no. 4; pp. 311 - 325 |
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| Autores principales: | , , , , , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Sage Publications Inc.
2022
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=159999137&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 159999137 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 09593020 3M5 jtl: Isokinetics & Exercise Science issn: 09593020 maglogo: N pubinfo: dt: 2022 vid: 30 iid: 4 pid: 344 pub: Sage Publications Inc. place: Thousand Oaks, California artinfo: ui: 159999137 156119856 159999137 159999137 10.3233/IES-210229 159999137 ppf: 311 ppct: 14 formats: tig: atl: Coactivation does not contribute to fatigue-induced decreases in torque during reciprocal, isokinetic muscle actions. aug: au: Neltner, Tyler J. Anders, John Paul V. Smith, Robert W. Arnett, Jocelyn E. Keller, Joshua L. Housh, Terry J. Schmidt, Richard J. Johnson, Glen O. affil: Department of Nutrition and Health Sciences, University of Nebraska – Lincoln, Lincoln, NE, USA sug: subj: Muscle Fatigue Torque Isokinetic Exercises Physiology Muscles Physiology Biceps Brachii Muscles Physiology Triceps Brachii Physiology Forearm Physiology Men's Health Task Performance and Analysis Human Young Adult Electromyography Repeated Measures Analysis of Variance Post Hoc Analysis Descriptive Statistics Neuromuscular Control Extension Flexion ab: BACKGROUND: Studies of coactivation have typically utilized single movement isometric or isokinetic fatiguing muscle actions. OBJECTIVE: The purpose of the current study was to examine coactivation of the biceps brachii (BB) and triceps brachii (TB) in response to a maximal, reciprocal, isokinetic fatiguing task of the forearm flexors and extensors at slow (60 ∘ /s) and moderate (180 ∘ /s) isokinetic velocities in men. METHODS: Ten men (mean ± SD: age = 21.6 ± 1.3 years) completed 50 consecutive, maximal, reciprocal, isokinetic muscle actions of the right forearm flexors and extensors at 60 and 180 ∘ /s. The amplitude (AMP) and mean power frequency (MPF) contents of the electromyographic (EMG) and mechanomyographic (MMG) signals from the BB and TB were recorded simultaneously throughout the fatiguing task. Repeated measures ANOVAs with Tukey post hocs were used to determine mean differences for the torque and neuromuscular parameters across repetitions. RESULTS: The torque analyses indicated greater fatigability at 180 ∘ /s, compared to 60 ∘ /s (p = 0.02). There were no significant changes in EMG AMP for either muscle during flexion or extension at 60 ∘ /s (p > 0.05). At 180 ∘ /s, there were significant increases in agonist EMG AMP (p = 0.01 to 0.004), however, no changes in antagonist EMG AMP (p > 0.05). For EMG MPF, there were significant decreases during flexion and extension (p < 0.001 to p = 0.02) at both velocities, collapsed across muscle. There were no significant (p > 0.05) changes across repetition for MMG AMP or MPF. CONCLUSIONS: This study indicated velocity-specific responses to fatigue, with a greater magnitude of fatigability at 180 ∘ /s. Furthermore, despite increases in EMG AMP of the agonist muscles at 180 ∘ /s only, it was not sufficient to alter the ratio of coactivation, likely due to common neural drive between muscles. Thus, the decreases in torque in the present study were not attributable to increases in coactivation. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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