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Related Experiment Videos

Effects of temperature on electromyogram and muscle function.

M Holewijn1, R Heus

  • 1NLRGC, Netherlands Aerospace Medical Centre, Department of Research and Development, Soesterberg.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1992
PubMed
Summary
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Cold water immersion significantly impairs arm muscle function, reducing maximal grip force and force development speed. Warming had no significant effect on these parameters, highlighting the detrimental impact of cooling on muscle performance.

Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Environmental Extremes

Background:

  • Muscle function is sensitive to temperature changes.
  • Understanding thermal effects on muscle performance is crucial for athletes and occupational safety.

Purpose of the Study:

  • To investigate the effects of localized cooling and warming on human arm muscle function.
  • To analyze changes in maximal grip force, force development rate, and rhythmic grip frequency.
  • To assess electromyographic (EMG) activity during different temperature conditions.

Main Methods:

  • Nine healthy young males were exposed to 30 minutes of cooling (15°C water), warming (40°C water), or a reference condition (24°C air).
  • Maximal grip force (Fmax), rate of force buildup, and maximal rhythmic grip frequency were measured.

Related Experiment Videos

  • Surface EMG, including root mean square (rms) and median power frequency (MPF), was recorded from the flexor digitorum superficialis.

    • Main Results:

    • Cooling significantly decreased Fmax by 20%, force buildup time by 50%, and maximal rhythmic grip frequency by 50%.
    • Warming did not significantly alter these parameters.
    • EMG-force relationship (rms) remained stable, but cooling reduced MPF by 50% and altered force-related EMG changes during sustained contractions.

    Conclusions:

    • Localized cooling significantly impairs key aspects of arm muscle function, including maximal strength and rapid force production.
    • Muscle fatigue characteristics, as indicated by EMG changes, are altered by cold exposure.
    • Warming does not appear to negatively impact these specific measures of arm muscle function.