Summary
A surface electrode array has been used to investigate the relationship between muscle fibre conduction velocity and the frequency spectrum during sustained isometric contractions of the biceps brachii. Measurement of muscle fibre conduction velocity was made directly, using the zero-crossing time delay method with two pairs of bipolar electrodes. It was found that the average conduction velocity during an intense (12 kg) sustained contraction decreased by about 20% at the end of the contracting period. Except for peak frequency, changes in the spectral parameters decreased in a similar manner. These results indicate that, during fatiguing contraction, spectral modifications are partly due to reduction in the action potential conduction velocity along the muscle fibres.
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Sadoyama, T., Masuda, T. & Miyano, H. Relationships between muscle fibre conduction velocity and frequency parameters of surface EMG during sustained contraction. Europ. J. Appl. Physiol. 51, 247–256 (1983). https://doi.org/10.1007/BF00455188
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DOI: https://doi.org/10.1007/BF00455188