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Related Experiment Videos

Decrease in force potentiation and appearance of alpha-adrenergic mediated contracture in aging rat skeletal muscle.

R C Carlsen, D A Walsh

    Pflugers Archiv : European Journal of Physiology
    |March 1, 1987
    PubMed
    Summary
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    Aging reduces muscle contractile function and alters receptor activity in rat hindfoot muscles. Older rats showed impaired potentiation, increased fatigue, and developed novel catecholamine-induced contractures, suggesting age-related changes in muscle physiology.

    Area of Science:

    • Physiology
    • Gerontology
    • Muscle Biology

    Background:

    • Skeletal muscle function declines with age, impacting mobility and health.
    • Understanding age-related changes in specific muscle types, like the fast-twitch oxidative glycolytic (FOG) flexor digitorum brevis (FDB), is crucial.

    Purpose of the Study:

    • To investigate the effects of aging on the contractile performance and catecholamine receptor activity of the rat FDB muscle.
    • To characterize age-dependent alterations in muscle potentiation, fatigue resistance, and responses to adrenergic stimulation.

    Main Methods:

    • Isolated rat FDB muscles from young and aged animals were studied in vitro.
    • Muscle contractile properties, including post-tetanic potentiation, staircase response, and fatigue, were assessed.
    • Responses to epinephrine and the role of alpha-adrenergic receptors and calcium were examined.

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    Main Results:

    • Contractile performance, including post-tetanic potentiation and staircase response, significantly declined with age.
    • Aging muscles exhibited increased fatigue rates during sustained stimulation.
    • Aged FDB muscles developed prolonged contractures in response to epinephrine, mediated by alpha-adrenergic receptors and calcium.

    Conclusions:

    • Increasing age impairs the contractile capacity and alters catecholamine receptor signaling in rat FDB muscles.
    • Age-associated changes include reduced potentiation, increased fatigue, and the emergence of alpha-adrenergic receptor-dependent contractures.
    • These findings suggest that altered adrenergic receptor activity contributes to age-related muscle dysfunction.