Abstract
Objectives Purpose is to compare the properties of motor unit potentials (MUP) voluntarily recorded from neuromuscular junction (NMJ) and 5 cm distally from NMJ (near tendon) of the biceps muscle. Methods We recorded MUPs in voluntarily activated biceps muscle from 5 healthy controls and 6 patients with motor neuron disease (MND), 7 patients with myopathy. We evaluated amplitudes and durations from neuromuscular junction and near tendon with concentric needle electrodes. Results The mean duration from NMJ and tendon were 6.37 and 7.4 ms in healthy controls; 4.94 and 4.35 ms in patients with myopathy; 8.52 and 11.2 ms in patients with MND respectively. The mean amplitudes from NMJ and tendon were 456 and 474 μV in healthy controls, 508 and 421 μV in patients with myopathy; 1169 and 1032 μV in patients with MND respectively. Conclusions Amplitudes of MUPs decrease with recording from near tendon in myopathy and neuropathy. Duration of MUPs do not change significantly in myopathy and healthy controls, but increase in neuropathy.
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