Specificity of surface-EMG on the intrinsic lumbar back muscles

P. Vink*, H. A M Daanen, A.J. Verbout

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


The cross-correlation coefficient functions (CCCFs) between twelve bipolar surface electrodes, placed symmetrically on the intrinsic lumbar back muscles (ILBM) were computed in order to estimate the amount of cross-talk. It was found that the CCCF values were mainly influenced by the distance between the electrodes. Other factors, such as static versus dynamic experimental conditions, the activity level, the angle between the dipole axis and the muscle fibres, the ECG, noise, power-line-induced-a.c.-components and resistance of biological material, have less influence, but nevertheless they do change the CCCF values. The absolute maximum in the CCCF can be used to validate EMG-signals. Absolute maxima in the CCCF within the range from 0 to 0.30 are considered as sufficient specific EMG-signals. The technique can be used to optimise the location of electrodes for the selective recording of localised muscle activity.

Original languageEnglish
Pages (from-to)67-78
Number of pages12
JournalHuman Movement Science
Issue number1
Publication statusPublished - 1989


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