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Related Experiment Videos

Metabolic fluctuation during a muscle contraction cycle

Y Chung1, R Sharman, R Carlsen

  • 1Department of Biological Chemistry, University of California, Davis 95616-8635, USA.

The American Journal of Physiology
|April 8, 1998
PubMed
Summary

Muscle contraction involves rapid energy fluctuations. Phosphocreatine (PCr) hydrolysis during a single muscle twitch yields significantly more ATP than previously estimated, indicating dynamic energy shifts.

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Area of Science:

  • Physiology
  • Biochemistry
  • Biophysics

Background:

  • Muscle contraction relies on immediate energy supply.
  • Phosphocreatine (PCr) serves as a rapid ATP buffer in muscle.
  • Previous estimates of ATP production during muscle twitches may be underestimated.

Purpose of the Study:

  • To investigate metabolic fluctuations during a single muscle contraction cycle.
  • To quantify ATP production from PCr hydrolysis during a twitch.
  • To compare dynamic ATP production with steady-state estimates.

Main Methods:

  • Utilized gated 31P-nuclear magnetic resonance (NMR) spectroscopy.
  • Monitored metabolic changes in rat gastrocnemius muscle during contraction.
  • Measured phosphocreatine (PCr), inorganic phosphate (Pi), and adenosine triphosphate (ATP) levels.

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Main Results:

  • Phosphocreatine (PCr) levels dropped by 11.3% within 16 ms of stimulation.
  • PCr depletion coincided with peak muscle force.
  • Inorganic phosphate (Pi) increased stoichiometrically, while ATP remained constant.
  • PCr hydrolysis yielded 3.1 µmol ATP/g tissue per twitch, exceeding prior steady-state values.

Conclusions:

  • Muscle twitches exhibit significant metabolic energy fluctuations.
  • Dynamic ATP production from PCr hydrolysis is substantially higher than previously reported.
  • Steady-state measurements may not fully capture the rapid energy dynamics of muscle contraction.