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Open AccessFeature PaperArticle

Inter- and Intra-Individual Differences in EMG and MMG during Maximal, Bilateral, Dynamic Leg Extensions

1
Department of Nutrition and Human Sciences, University of Nebraska-Lincoln, Lincoln, NE 68510, USA
2
College of Health Sciences, Kinesiology, University of Texas at El Paso, El Paso, TX 79968, USA
3
School of Kinesiology & Physical Therapy, Division of Kinesiology, University of Central Florida, Orlando, FL 32816, USA
*
Author to whom correspondence should be addressed.
Sports 2019, 7(7), 175; https://doi.org/10.3390/sports7070175
Received: 17 June 2019 / Revised: 4 July 2019 / Accepted: 16 July 2019 / Published: 18 July 2019
(This article belongs to the Special Issue The Evaluation of Exercise Using Electromyography)
The purpose of this study was to compare the composite, inter-individual, and intra-individual differences in the patterns of responses for electromyographic (EMG) and mechanomyographic (MMG) amplitude (AMP) and mean power frequency (MPF) during fatiguing, maximal, bilateral, and isokinetic leg extension muscle actions. Thirteen recreationally active men (age = 21.7 ± 2.6 years; body mass = 79.8 ± 11.5 kg; height = 174.2 ± 12.7 cm) performed maximal, bilateral leg extensions at 180°·s−1 until the torque values dropped to 50% of peak torque for two consecutive repetitions. The EMG and MMG signals from the vastus lateralis (VL) muscles of both limbs were recorded. Four 2(Leg) × 19(time) repeated measures ANOVAs were conducted to examine mean differences for EMG AMP, EMG MPF, MMG AMP, and MMG MPF between limbs, and polynomial regression analyses were performed to identify the patterns of neuromuscular responses. The results indicated no significant differences between limbs for EMG AMP (p = 0.44), EMG MPF (p = 0.33), MMG AMP (p = 0.89), or MMG MPF (p = 0.52). Polynomial regression analyses demonstrated substantial inter-individual variability. Inferences made regarding the patterns of neuromuscular responses to fatiguing and bilateral muscle actions should be considered on a subject-by-subject basis. View Full-Text
Keywords: electromyography; mechanomyography; neuromuscular; fatigue; isokinetic; maximal; dynamic; vastus lateralis electromyography; mechanomyography; neuromuscular; fatigue; isokinetic; maximal; dynamic; vastus lateralis
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Anders, J.P.V.; Smith, C.M.; Keller, J.L.; Hill, E.C.; Housh, T.J.; Schmidt, R.J.; Johnson, G.O. Inter- and Intra-Individual Differences in EMG and MMG during Maximal, Bilateral, Dynamic Leg Extensions. Sports 2019, 7, 175.

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