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Temperature effects on mammalian muscle contraction.

K W Ranatunga1, S R Wylie

  • 1Department of Physiology, Medical School, University of Bristol, England.

Biomedica Biochimica Acta
|January 1, 1989
PubMed
Summary

Muscle temperature significantly impacts muscle tension. Cooling fast muscles initially boosts twitch tension, while both fast and slow muscles show reduced tetanic tension at lower temperatures, affecting muscle function.

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Area of Science:

  • Muscle Physiology
  • Mammalian Muscle Function

Background:

  • Temperature influences skeletal muscle performance.
  • Understanding temperature effects on muscle tension is crucial for physiological studies.

Purpose of the Study:

  • To re-examine the effects of temperature on isometric twitch and tetanic tensions in mammalian fast and slow muscles.
  • To investigate the developmental timeline of temperature-dependent muscle responses.

Main Methods:

  • Experiments were conducted on rat fast and slow muscles across a temperature range of 8°C to 37°C.
  • Isometric twitch and tetanic tensions were measured at various temperatures.
  • Developmental changes were assessed from one week to four weeks post-birth.

Main Results:

  • Fast muscle twitch tension increased upon cooling to 20°C, then decreased with further cooling; slow muscle twitch tension decreased monotonically with cooling.
  • Cooling-induced potentiation in fast muscle was observed within a week of birth, while depression in slow muscle developed by the fourth week.
  • Maximal tetanic tension decreased by 10-20% at 25°C and more significantly below 20°C, reaching 40-50% of 35°C levels at 10°C.

Conclusions:

  • Cooling depression of tetanic tension may result from direct effects on cross-bridges.
  • Twitch tension variations likely stem from a combination of cross-bridge effects and altered calcium sensitivity.
  • Temperature-dependent muscle responses exhibit developmental differences between fast and slow muscle types.

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