Background: Somatosensory evoked potentials (SEPs) are used extensively to quantify cortical activity in response to noxious and/or non-noxious sensory stimuli. However, data demonstrating the reliability of SEP measures in response to non-noxious stimulation over time are scarce.
Aim: We investigated the relative and absolute reliability, and the smallest detectable change at 95% confidence (SDC) for SEPs evoked by non-noxious electrical stimulation of the paraspinal muscles in thirty-nine healthy participants at a 3-month interval.
Methods: SEPs were evoked at an intensity three-times that of each participant's perceptual threshold and recorded from a single electrode placed over the primary somatosensory cortex (S1).
Results: Our analyses reveal that i) latency, as a measure of activity onset, has poor relative reliability but good absolute reliability; ii) area, as a measure of cortical activity, has good relative and absolute reliability (except for the N component) and iii) perceptual threshold and stimulation intensity was not reliable over time.
Conclusion: These findings suggest that the area of the N and P SEP components, and the area of the N-N-P SEP complex, can be utilised in future studies as reliable markers of cortical activity.
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