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Age-related changes in monosynaptic reflex excitability

M A Sabbahi, E M Sedgwick

    Journal of Gerontology
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Older adults exhibit reduced H-reflex excitability, characterized by higher thresholds and longer latencies. These age-related changes in the Hoffmann reflex (H-reflex) are crucial for clinical interpretations.

    Area of Science:

    • Neuroscience
    • Physiology
    • Gerontology

    Background:

    • The Hoffmann reflex (H-reflex) is a valuable tool for assessing neural excitability.
    • Age-related changes in the nervous system can impact reflex responses.
    • Understanding these changes is vital for accurate clinical assessment in older populations.

    Purpose of the Study:

    • To compare the H-reflex excitability between younger and older adult groups.
    • To identify age-dependent alterations in H-reflex parameters.
    • To inform the clinical application of H-reflex testing in elderly individuals.

    Main Methods:

    • Electromyography was used to record the H-reflex and M-response.
    • H-reflex excitability was assessed by measuring threshold, latency, amplitude, and duration.

    Related Experiment Videos

  • H-reflex recovery curves were analyzed to evaluate central inhibitory processes.
  • Participants were divided into two age groups: younger (19-31 years) and older (60-72 years).

    • Main Results:

    • Older adults had a higher H-reflex threshold and significantly longer reflex latency (7 msec).
    • H-reflex amplitude was smaller, duration longer, and waveform more polyphasic in older subjects.
    • Central latency (M-response to H-reflex delay) was longer by 5 msec in the older group.
    • Older subjects showed a prolonged primary inhibition period (94 msec vs. 44 msec) and slower H-reflex recovery.

    Conclusions:

    • Age-related declines in H-reflex excitability are evident, likely due to central and peripheral neural changes.
    • These neurophysiological alterations in older adults necessitate adjustments in H-reflex interpretation.
    • Clinical use of H-reflex testing requires consideration of age-specific normative data.