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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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  1. Home
  3. Immediate Effects Of Passive Stretching And/or Local Vibration On Ankle Range Of Motion, Calf Muscle Stiffness And Passive Torque: A Randomized Controlled Cross-over Trial.
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  3. Immediate Effects Of Passive Stretching And/or Local Vibration On Ankle Range Of Motion, Calf Muscle Stiffness And Passive Torque: A Randomized Controlled Cross-over Trial.

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Immediate effects of passive stretching and/or local vibration on ankle range of motion, calf muscle stiffness and

Daniel Jochum1, Andreas Konrad2, Josef Fischer2

  • 1Department of Health Science and Technology, ETH Zürich, Zurich, Switzerland. daniel.jochum@hest.ethz.ch.

European Journal of Applied Physiology
|June 12, 2025

View abstract on PubMed

Summary
This summary is machine-generated.
Keywords:
DynamometryFlexibilityUltrasoundVibratory stimulation

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Adding vibration to stretching does not further increase range of motion (ROM) compared to stretching alone. However, the combination of stretching and vibration significantly impacts passive torque and joint resistance, potentially improving exercise adherence.

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Vibrational stimulation is proposed to acutely enhance range of motion (ROM).
  • The specific benefits and underlying mechanisms of vibration-induced ROM increases remain unclear.
  • Understanding these effects is crucial for optimizing physical therapy and athletic training protocols.

Purpose of the Study:

  • To investigate the acute effects of superimposed vibration on range of motion (ROM).
  • To compare the efficacy of stretching plus vibration (STV) against stretching (ST) and vibration (V) alone.
  • To explore the underlying mechanical and sensory mechanisms influencing ROM changes.

Main Methods:

  • A randomized controlled cross-over trial involving 30 healthy participants.
  • Interventions included 2 minutes of STV, V, ST, and a passive control (CG).
  • Measurements comprised ankle dorsiflexion ROM, passive torque, and muscle stiffness using a dynamometer and shear wave elastography.

    • Main Results:

    • All interventions significantly improved ROM compared to the control group.
    • No additional ROM benefits were observed when vibration was combined with stretching compared to stretching or vibration alone.
    • STV demonstrated the most significant reductions in passive torque and affected torque at end-range and rest, suggesting additive effects.

    Conclusions:

    • Superimposed vibration does not offer additional acute ROM benefits beyond stretching alone.
    • The combination of stretching and vibration most effectively influences passive torque and joint resistance.
    • Vibration may enhance stretching pain tolerance, potentially improving exercise compliance and adherence.