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Velocity-Specific Coactivation and Neuromuscular Responses to Fatiguing, Reciprocal, Isokinetic, Forearm Flexion, and Extension Muscle Actions.
- Source :
-
Journal of Strength & Conditioning Research . Mar2022, Vol. 36 Issue 3, p649-660. 12p. - Publication Year :
- 2022
-
Abstract
- Neltner, TJ, Anders, JPV, Keller, JL, Smith, RW, Housh, TJ, Schmidt, RJ, and Johnson, GO. Velocity-specific coactivation and neuromuscular responses to fatiguing, reciprocal, isokinetic, forearm flexion, and extension muscle actions. J Strength Cond Res 36(3): 649-660, 2022-The purpose of this study was to examine the effects of fatiguing, reciprocal, maximal, isokinetic, forearm flexion, and extension on coactivation. Ten recreationally trained women (mean +/- SD : age = 21 +/- 1.63 years) performed 50 maximal, reciprocal, isokinetic, forearm flexion, and extension muscle actions at 60 and 180[degrees][middle dot]s-1 on separate days. Electromyographic (EMG) and mechanomyographic (MMG) signals from the biceps brachii (BB) and triceps brachii (TB) were recorded. A 2 (time) x 2 (velocity) x 2 (movement) and 4 separate 2 (time) x 2 (velocity) x 2 (muscle) x 2 (movement) repeated-measures analysis of variances were used to examine normalized torque and normalized EMG and MMG amplitude (AMP) and mean power frequency, respectively, with an alpha of p < 0.05. There were no significant interactions for torque but a main effect for time (p < 0.001, d = 3.29) such that it decreased. There was a significant four-way interaction for EMG AMP (p = 0.004, = 0.61) which revealed parallel responses between the BB and TB during both movements, with no changes at 60[degrees][middle dot]s-1 and increases at 180[degrees][middle dot]s-1. The current findings suggested a common drive between agonist and antagonist muscles during fatiguing forearm flexion and extension muscle actions, with velocity-specific activation strategies. In addition, both EMG and MMG are viable techniques for assessing coactivation during fatiguing exercise. Equation (Uncited) Opens a popup window Opens a popup window Opens a popup window [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10648011
- Volume :
- 36
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Strength & Conditioning Research
- Publication Type :
- Academic Journal
- Accession number :
- 155334830
- Full Text :
- https://doi.org/10.1519/JSC.0000000000004190