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Related Experiment Videos

Thermal dependence of muscle function.

A F Bennett

    The American Journal of Physiology
    |August 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Muscle force generation is temperature-independent, but contraction speed is highly temperature-dependent. This impacts animal performance across different body temperatures, with no significant acclimation observed.

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    Area of Science:

    • Muscle physiology
    • Comparative physiology
    • Thermal biology

    Background:

    • Muscle force generation (twitch and tetanus) is generally temperature-independent in vertebrates.
    • Anuran muscles generate maximal force at lower temperatures than mammalian muscles.
    • Twitch tension, unlike tetanic tension, is often not maximal at normal body temperatures and varies with muscle fiber type.

    Purpose of the Study:

    • To investigate the thermal dependence of muscle force generation and contraction rates across vertebrate taxa.
    • To compare the thermal sensitivity of muscle function in ectothermic (anurans) and endothermic (mammals) animals.
    • To determine the impact of temperature on muscle performance in vivo versus in vitro.

    Main Methods:

    • Analysis of maximal isometric forces (twitch and tetanus) at various temperatures.

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  • Measurement of muscle contraction rates (time to peak tension, tetanic rise time).
  • Assessment of maximal shortening velocity and power output.
  • Comparison of Q10 values for rate processes in anuran and mammalian muscle.
  • Evaluation of in vivo versus isolated muscle performance.

    • Main Results:

    • Maximal isometric forces (twitch and tetanus) show low temperature dependence.
    • Contraction rates (tension development, shortening velocity, power output) are highly temperature dependent (Q10 ≈ 2.0-2.5).
    • Anuran muscle exhibits slightly lower Q10 values for rate processes than mammalian muscle.
    • High body temperatures enhance muscle contraction rates, but animals at low temperatures do not reach maximal performance.
    • Thermal acclimation or hibernation does not significantly alter force generation or rate processes.
    • In vivo dynamic muscle processes are temperature-dependent, but less so than in isolated muscle; static force is nearly temperature-independent.

    Conclusions:

    • Muscle force generation is largely insensitive to temperature, but contractile speed is significantly influenced by it.
    • Temperature directly impacts an animal's ability to perform dynamic movements, with optimal performance at higher body temperatures.
    • Despite thermal acclimation, intrinsic muscle properties related to speed and force do not appear to adjust to compensate for environmental temperature changes.