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Related Experiment Videos

Mounding phenomenon: an experimental study in vitro.

H Mizusawa, A Takagi, H Sugita

    Neurology
    |January 1, 1983
    PubMed
    Summary

    Percussion of skeletal muscle induces "mounding," a local contracture. This phenomenon is preserved after depolarization but disappears when the sarcoplasmic reticulum (SR) is destroyed, indicating SR calcium release is key.

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    Area of Science:

    • Muscle physiology
    • Skeletal muscle contracture
    • Cellular biomechanics

    Background:

    • "Mounding" is a localized skeletal muscle contracture triggered by direct tapping.
    • Understanding the underlying mechanisms of this phenomenon is crucial for muscle physiology research.

    Purpose of the Study:

    • To investigate the in vitro mechanism of skeletal muscle "mounding" induced by percussion.
    • To determine the role of intracellular calcium release in the mounding phenomenon.

    Main Methods:

    • In vitro study using rat skeletal muscles.
    • Percussion induced by a rotating hammer.
    • Assessment of sarcomere length changes in response to various solutions and agents.

    Main Results:

    • Mounding involves localized sarcomere shortening.
    • The phenomenon persists after muscle depolarization (KCl-Ringer or relaxing solution).
    • T-tubule and T-SR junction disruption did not affect mounding, but sarcoplasmic reticulum (SR) destruction abolished it.

    Conclusions:

    • Skeletal muscle mounding is a local contracture.
    • The phenomenon is likely caused by calcium ion release from the sarcoplasmic reticulum (SR) upon percussion.

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