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Related Experiment Videos

Metabolite changes in aged muscle during stimulation.

G A Dudley, S J Fleck

    Journal of Gerontology
    |March 1, 1984
    PubMed
    Summary

    Aged rat muscles show impaired energy balance during contraction compared to adult muscles. Key metabolites like phosphocreatine and adenosine-5'-phosphate decrease more, indicating reduced muscle energy reserves with age.

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    Area of Science:

    • Muscle physiology
    • Aging research
    • Metabolomics

    Background:

    • Skeletal muscle function declines with age.
    • Age-related changes in muscle energy metabolism are not fully understood.

    Purpose of the Study:

    • To compare energy metabolite concentrations in adult and aged rat skeletal muscles during contraction.
    • To investigate the impact of age on muscle's ability to maintain energy balance.

    Main Methods:

    • In situ stimulation of rat soleus and gastrocnemius muscles (adult vs. aged).
    • Measurement of adenosine-5 -phosphate, phosphocreatine, and lactate concentrations.
    • Analysis of cytochrome-c concentration.

    Main Results:

    • Phosphocreatine decreased and lactate increased with higher contractile frequencies, more so in aged muscles.
    • Adenosine-5 -phosphate decreased more in aged muscles.
    • Aged muscles showed reduced cytochrome-c concentration.

    Conclusions:

    • Aged skeletal muscle has a diminished capacity to sustain energy production during contraction.
    • Age-related metabolic alterations contribute to reduced muscle function in older rats.

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