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Repeated isokinetic plantar flexions at different angular velocities.

B Gerdle, M Långström

    Acta Physiologica Scandinavica
    |July 1, 1987
    PubMed
    Summary

    Contraction work (CW) is more sensitive to fatigue than peak torque (PT) and mean power (CP) during repetitive plantar flexions. CW fatigue increases with angular velocity, unlike PT and CP.

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    Area of Science:

    • Exercise Physiology
    • Biomechanics
    • Muscle Physiology

    Background:

    • Repetitive muscle contractions lead to fatigue, affecting performance metrics like peak torque, contraction work, and mean power.
    • Understanding muscle fatigue mechanisms is crucial for optimizing training and rehabilitation strategies.
    • Isokinetic testing provides a standardized method to assess muscle strength and endurance.

    Purpose of the Study:

    • To investigate the fatigue characteristics of plantar flexor muscles during repetitive isokinetic contractions.
    • To compare the fatigue sensitivity of peak torque (PT), contraction work (CW), and mean power (CP).
    • To examine the influence of different angular velocities on muscle fatigue and electromyographic (iEMG) activity.

    Main Methods:

    • Eight healthy females performed 200 maximal voluntary isokinetic plantar flexions at four different angular velocities (30, 60, 120, 180 degrees/s).
    • Peak torque (PT), contraction work (CW), and mean power (CP) were recorded.
    • Simultaneous integrated electromyograms (iEMG) of the triceps surae muscle were obtained.

    Main Results:

    • CW, CP, and PT decreased significantly within the first ~70 contractions, reaching a steady state thereafter.
    • Relative decreases in CW were significantly greater than PT and CP and increased with angular velocity.
    • iEMG activity also decreased in two phases, with greater reductions at higher velocities, but normalized decreases were similar across velocities when accounting for range of motion changes.

    Conclusions:

    • Contraction work (CW) is more susceptible to fatigue than peak torque (PT) and mean power (CP) during repetitive plantar flexion.
    • CW fatigue is velocity-dependent, increasing with higher angular velocities.
    • Muscle fatigue involves complex neuromuscular adaptations, with varying sensitivity of different performance parameters to velocity and duration.

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