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Ischemia causes muscle fatigue.

G Murthy1, A R Hargens, S Lehman

  • 1Department of Bioengineering. University of California, Berkeley, USA.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|June 12, 2001
PubMed
Summary

Reduced muscle oxygenation from ischemia significantly lowers forearm extensor muscle force. This study links decreased tissue oxygenation to muscle fatigue, highlighting the impact of ischemia on muscle performance.

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Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Biomedical Engineering

Background:

  • Ischemia, a condition of reduced oxygen supply, can affect muscle function.
  • Understanding the relationship between oxygenation and muscle force is crucial for sports science and rehabilitation.

Purpose of the Study:

  • To investigate if ischemia-induced reduction in extensor carpi radialis (ECR) muscle oxygenation leads to decreased muscle force production.
  • To quantify the relationship between muscle oxygenation levels and force output during induced ischemia.

Main Methods:

  • Noninvasive continuous monitoring of muscle oxygenation (TO2) using near-infrared spectroscopy (NIRS) in the ECR muscle.
  • Transcutaneous electrical stimulation (1 Hz, 0.1 ms) to elicit muscle twitch force.
  • Gradual induction of ischemia using upper arm tourniquet inflation to various pressure levels, including diastolic and systolic blood pressures.
Keywords:
NASA Discipline CardiopulmonaryNon-NASA Center

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Main Results:

  • Mean TO2 decreased significantly with increasing tourniquet pressure, reaching 86 +/- 2.7% at systolic pressure.
  • Mean twitch force also decreased significantly, correlating with reduced muscle oxygenation (r = 0.78, P < 0.001).
  • A reduction of 7% or more in muscle oxygenation was associated with a significant decrease in muscle force.

Conclusions:

  • Ischemia, even with a modest decline in tissue oxygenation (TO2), causes a reduction in forearm extensor muscle force production.
  • The findings indicate that reduced muscle oxygenation is a significant factor contributing to muscle fatigue.
  • This study provides evidence for a dose-dependent relationship between ischemia, muscle oxygenation, and force generation.