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Interaction of glucocorticoids and activity patterns affect muscle function

S L Dodd1, S K Powers, I S Vrabas

  • 1Department of Exercise and Sports Sciences, University of Florida, Gainesville 32611.

Muscle & Nerve
|February 1, 1995
PubMed
Summary
This summary is machine-generated.

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Glucocorticoids reduce muscle mass and increase fatigue in limb muscles, but may preserve force in some. Diaphragm muscle shows reduced mass and force but not increased fatigability.

Area of Science:

  • Physiology
  • Pharmacology
  • Muscle Biology

Background:

  • Glucocorticoids are potent regulators of muscle metabolism.
  • Their effects on muscle mass and function can vary based on muscle type and activity patterns.

Purpose of the Study:

  • To investigate the impact of glucocorticoids on muscle mass and contractile properties.
  • To compare effects on muscles with similar fiber composition but different activity levels (limb vs. diaphragm).

Main Methods:

  • Rats were treated with prednisolone or a placebo for 10 days.
  • Muscle mass and contractile properties (specific tension, maximal shortening velocity) were measured.
  • Fatigue index was assessed in gastrocnemius-plantaris-soleus (GPS) and diaphragm (D) muscles.

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Main Results:

  • Prednisolone treatment significantly decreased whole-body, GPS, and D weights.
  • Specific tension increased in GPS but decreased in diaphragm muscles.
  • Diaphragm fatigue was not affected, while GPS muscle showed increased fatigability.

Conclusions:

  • Glucocorticoids induce muscle atrophy in both limb and diaphragm muscles.
  • Altered muscle architecture may maintain force-generating capacity in some limb muscles.
  • Glucocorticoids do not increase diaphragm fatigability, unlike limb muscles.