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Task-specific performance fatigability and the bilateral deficit during isokinetic leg extensions.

John Paul V Anders1, Joshua L Keller2, Tyler J Neltner1

  • 1Department of Nutrition and Human Sciences, University of Nebraska- Lincoln, Lincoln, USA.

Journal of Musculoskeletal & Neuronal Interactions
|March 4, 2021
PubMed
Summary

Bilateral leg extensions show less performance fatigability than unilateral ones. This is likely due to interhemispheric inhibition reducing muscle activation during bilateral tasks.

Keywords:
Bilateral DeficitElectromyographyIsokineticMechanomyographyPerformance Fatigability

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Area of Science:

  • Exercise Physiology
  • Neuromuscular Physiology

Background:

  • Muscle fatigue is a complex phenomenon affecting performance.
  • Understanding the differences between unilateral and bilateral movements is crucial for training and rehabilitation.

Purpose of the Study:

  • To compare fatigue-induced changes in performance, bilateral deficit, and neuromuscular responses (EMG and MMG) during unilateral and bilateral leg extensions.
  • To investigate the influence of movement type on muscle fatigability and underlying physiological mechanisms.

Main Methods:

  • Nine healthy men performed 50 maximal isokinetic leg extensions at 180°·s-1 under bilateral (BL), unilateral dominant (DL), and unilateral non-dominant (NL) conditions.
  • Electromyographic (EMG) and mechanomyographic (MMG) signals from the vastus lateralis were recorded.
  • Data analyzed using repeated measures ANOVAs to assess differences in force, EMG/MMG amplitude and mean power frequency, and bilateral deficit.

Main Results:

  • A significant Condition × Repetition interaction was found for normalized force and EMG mean power frequency (MPF).
  • Main effects for Repetition were observed for EMG amplitude, MMG amplitude, MMG MPF, and the bilateral deficit.
  • The bilateral deficit was significantly affected by the repetition number and condition.

Conclusions:

  • Bilateral leg extensions exhibited less performance fatigability compared to unilateral tasks.
  • Reduced relative intensity and interhemispheric inhibition likely attenuated excitation-contraction coupling failure during bilateral contractions.
  • These findings suggest different neuromuscular strategies are employed during unilateral versus bilateral fatiguing contractions.