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Nitric oxide and skeletal muscle contractile function.

Ravi Kumar1, Andrew R Coggan2, Leonardo F Ferreira3

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|April 11, 2022
PubMed
Summary
This summary is machine-generated.

Nitric oxide (NO) plays a complex role in skeletal muscle function. While in vitro studies show NO diminishes force, in vivo studies suggest it enhances muscle power and speed, with potential therapeutic uses.

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Area of Science:

  • Muscle Physiology
  • Nitric Oxide Signaling
  • Skeletal Muscle Contractile Function

Background:

  • Nitric oxide (NO) is a multifaceted modulator of skeletal muscle contractile function.
  • Its effects on force and power output can vary based on numerous factors, including experimental conditions and administration methods.

Purpose of the Study:

  • To review the effects of nitric oxide (NO) on skeletal muscle contractile function.
  • To explore the potential mechanisms underlying NO's modulation of muscle force and power.
  • To examine NO's role from pharmacological interventions to dietary nitrate supplementation.

Main Methods:

  • Review of studies involving pharmacological NO manipulation in isolated muscle preparations.
  • Analysis of research on dietary nitrate supplementation in humans and animals.
  • Discussion of proposed mechanisms involving post-translational modifications of myofibrillar proteins.

Main Results:

  • In vitro NO signaling appears to diminish submaximal isometric force.
  • In vivo dietary NO manipulation suggests enhancement of submaximal force.
  • Maximal isometric force is generally unaffected by physiologically relevant NO levels.
  • Both pharmacological and dietary NO manipulation enhance maximal contraction rate, unloaded shortening velocity, and peak power.

Conclusions:

  • Nitric oxide (NO) exhibits complex, context-dependent effects on skeletal muscle contractile function.
  • Potential mechanisms involve post-translational modifications influencing myofibrillar protein regulation.
  • Further research using advanced assays is needed to elucidate NO's therapeutic and ergogenic potential in aging, disease, and athletic performance.