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Physical activity: its influence on nerve conduction velocity.

E M Halar, M C Hammond, S Dirks

    Archives of Physical Medicine and Rehabilitation
    |September 1, 1985
    PubMed
    Summary

    Physical activity significantly alters nerve conduction test results by changing skin temperature. Post-exercise rest periods may not be sufficient for lower extremity temperatures to stabilize, impacting nerve latency measurements.

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    Area of Science:

    • Neuroscience
    • Physiology
    • Electromyography

    Background:

    • Nerve conduction studies (NCS) are crucial for diagnosing neurological disorders.
    • Skin temperature significantly influences nerve conduction velocities and latencies.
    • The impact of acute physical activity on peripheral nerve temperature and NCS parameters requires further investigation.

    Purpose of the Study:

    • To investigate the effects of walking and bicycling on skin temperature and nerve conduction parameters in healthy subjects.
    • To determine the influence of physical activity-induced temperature changes on distal and proximal latencies of various peripheral nerves.
    • To assess the adequacy of post-exercise rest periods for temperature stabilization in lower and upper extremities.

    Main Methods:

    • Measurements of skin temperature (Tsk) and nerve conduction parameters (distal and proximal latencies) for median, tibial, peroneal, and sural nerves.

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  • Baseline NCS performed after 30 minutes of rest in a controlled 24°C room.
  • Subjects underwent 30 minutes of either walking or bicycling, with NCS performed at multiple time points post-activity (within 30 min, 45-60 min, and 75-90 min for bicycling).

    • Main Results:

    • Walking significantly increased Tsk and accelerated distal/proximal latencies in lower extremity nerves.
    • Bicycling led to reduced lower extremity Tsk and prolonged sural nerve latencies, while median nerve Tsk increased and distal latency accelerated in upper extremities.
    • Observed changes suggest activity-induced temperature alterations significantly impact NCS findings, with 30 minutes of rest potentially insufficient for lower extremity temperature normalization.

    Conclusions:

    • Acute physical activity, such as walking and bicycling, significantly affects peripheral nerve skin temperature.
    • These temperature fluctuations directly influence nerve conduction latency measurements, potentially mimicking or masking pathological conditions.
    • Current post-exercise rest protocols may be inadequate for stabilizing lower extremity temperatures, necessitating careful consideration during NCS interpretation.