Muscle contractile properties by surface electrodes compared with those by needle electrodes

T. Fujimoto, H. Nishizono

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We measured the contractile properties of the first dorsal interosseous muscle by surface electrodes and needle electrodes during submaximal voluntary contraction. Twenty-seven single motor units were recorded from 5 volunteers by surface electrodes, which were confirmed by subsequent needle electrode recordings. Twitch tension ranged from 0.6 to 10.0 g with a mean of 3.7 g based on an averaging method triggered by surface myoelectric signals, and the tension calculated from the needle myoelectric signals ranged from 0.8 to 11.7 g with a mean of 3.6 g. Rise time ranged from 33.9 to 81.6 msec with a mean of 49.4 msec for the surface electrode recordings, and from 33.0 to 73.2 msec with a mean of 50.8 msec for the needle electrode recordings. The obtained data of surface electrode recordings indicated a high correlation with that of the needle electrode recordings, r = 0.92 (P < 0.001) for twitch tension and r = 0.91 (P < 0.001) for rise time. We also found a positive correlation between threshold force and twitch tension (by surface electrodes: r = 0.71, P < 0.05; by needle electrodes: r = 0.77, P < 0.05). Our studies indicate that it is possible to record single motor units by non-invasive surface electrodes provided that the unit has a threshold force of less than 2 kg.

Original languageEnglish
Pages (from-to)247-251
Number of pages5
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Issue number4
Publication statusPublished - 1993 Aug


Dive into the research topics of 'Muscle contractile properties by surface electrodes compared with those by needle electrodes'. Together they form a unique fingerprint.

Cite this