Date of Award

1998

Degree Type

Thesis

Degree Name

Physical Therapy (M.S.)

Department

Physical Therapy

Abstract

The purpose of this descriptive study was to measure crosstalk when using surface electrodes over the peroneus brevis and peroneus longus muscles. EMG was recorded from the right lower extremity of 14 normal subjects, taken from a sample of convenience. Surface electrodes were applied over the peroneus brevis and peroneus longus muscles; fine wire electrodes were inserted into the peroneus longus, peroneus brevis, anterior tibialis and extensor digitorum longus muscles of each subject. During manual muscle tests for the peroneals, anterior tibialis, and extensor digitorum longus, data were recorded from all electrodes simultaneously over 5 trials of each. Pearson product-moment correlation and stepwise multiple regression were used to analyze the processed, normalized EMG data. Crosstalk was found in data collected by surface electrodes over the peroneus longus and brevis. Crosstalk was more evident from neighboring muscles when the peroneals contracting at submaximal levels. Futhermore, crosstalk was more evident form synergistic muscles than from antagonists when the targeted muscle was working near its maximum. Cocontraction of antagonistic muscles was found during maximal voluntary isometric muscle contractions. The results of this study suggest that when specific information regarding timing, onset, and/or duration of peroneus longus or peroneus brevis activity is desired, surface electrodes are likely to include unacceptable amounts of inaccurate data.

Comments

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