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Related Concept Videos

Muscles that Move the Leg01:23

Muscles that Move the Leg

The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
Anterior Compartment
The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed to...

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Fatiguing, Unilateral, Maximal Intended Velocity Leg Extensions Do Not Affect the Performance of the Contralateral

Trevor D Roberts1, Jocelyn E Arnett2, Justin S Pioske1

  • 1Department of Nutrition and Health Sciences, Exercise Physiology Laboratory, University of Nebraska-Lincoln, Lincoln, Nebraska; and.

Journal of Strength and Conditioning Research
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Summary

Performing unilateral leg extensions to failure does not impact the contralateral limb's performance. This suggests that fatigue is localized to the working limb, with no cross-over effect observed in healthy individuals.

Keywords:
crossover effectselectromyographyneuromuscular fatigueresistance trainingvelocity-based training

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Neuromuscular Function

Background:

  • Unilateral fatiguing exercise is common in sports and rehabilitation.
  • Understanding the neuromuscular responses and potential contralateral effects is crucial for training and recovery protocols.
  • Previous research on cross-transfer effects of fatigue has yielded mixed results.

Purpose of the Study:

  • To investigate the impact of a fatiguing, unilateral, maximal intended velocity (MIV) leg extension task on the performance and neuromuscular outcomes of both the working and nonworking limbs.
  • To determine if peripheral fatigue induced by unilateral exercise affects the contralateral limb's force production, velocity, and power output.
  • To analyze muscle-specific fatigue patterns within the working limb.

Main Methods:

  • Twelve recreationally active men performed unilateral MIV leg extensions to failure at 40% of their 1-repetition maximum.
  • Performance (force, velocity, power) and neuromuscular (electromyographic amplitude, mean power frequency) data were collected for both limbs before and after the fatiguing task.
  • Statistical analysis involved separate 2-way and 3-way repeated-measures ANOVAs to assess performance and neuromuscular outcomes, respectively.

Main Results:

  • The working limb exhibited significant decreases in all performance outcomes (force, velocity, power) from pre- to post-task.
  • The nonworking limb showed no significant changes in performance outcomes.
  • Electromyographic amplitude increased in the working limb, indicating greater neural drive, while mean power frequency decreased, suggesting peripheral fatigue, particularly in the rectus femoris muscle.

Conclusions:

  • Fatiguing, unilateral, maximal intended velocity leg extensions lead to peripheral, muscle-specific fatigue in the working limb.
  • No significant cross-transfer of fatigue or performance decrements were observed in the contralateral limb.
  • These findings suggest that unilateral training interventions primarily induce localized fatigue without affecting the performance capacity of the non-exercised limb.