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Involuntary ankle oscillations from normal subjects

R N Stiles, R R Rietz

    The American Journal of Physiology
    |July 1, 1977
    PubMed
    Summary
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    Ankle tremor amplitude increases significantly with sustained heel elevation, while its frequency decreases. This postural ankle tremor

    Area of Science:

    • Neuroscience
    • Biomechanics
    • Human Physiology

    Background:

    • Postural tremors are involuntary oscillations of body parts during posture maintenance.
    • Ankle tremor characteristics, particularly during sustained muscle activity, require further investigation.
    • Understanding tremor dynamics can inform neurological and musculoskeletal disorder assessments.

    Purpose of the Study:

    • To analyze the spectral characteristics of ankle tremor during prolonged heel elevation.
    • To investigate the relationship between ankle tremor amplitude, frequency, and soleus muscle electromyography (EMG) activity.
    • To compare postural ankle tremor dynamics with previously observed hand tremor patterns.

    Main Methods:

    • Spectral analysis of ankle tremor displacement in seated subjects undergoing continuous heel elevation (10-45 min).

    Related Experiment Videos

  • Measurement of root-mean-square (rms) displacement amplitude and tremor frequency.
  • Spectral analysis of demodulated soleus EMG signals, correlating EMG rms values with tremor displacement.

    • Main Results:

    • Ankle tremor amplitude (rms displacement) increased from ~4 to ~4,000 micronm.
    • Tremor frequency systematically decreased from 7-8 Hz to 5-6 Hz as amplitude increased.
    • A power function relationship was observed between soleus EMG rms values and tremor displacement.

    Conclusions:

    • Sustained postural effort significantly alters ankle tremor characteristics, increasing amplitude and decreasing frequency.
    • Soleus muscle activity is directly related to ankle tremor magnitude, suggesting a neuromuscular control involvement.
    • The observed inverse relationship between frequency and amplitude in ankle tremor mirrors findings in hand tremor.