Reproducibility of electromyographic measures: a statistical analysis

Area of Science:

• Biomedical Engineering
• Neuroscience
• Dental Science

Background:

• Surface electromyography (sEMG) is a valuable tool for assessing muscle activity.
• Understanding the reliability of sEMG measurements in masticatory muscles is crucial for clinical diagnostics and research.

Purpose of the Study:

• To evaluate the reproducibility of surface electromyography measurements for the masseter, temporalis anterior, and digastric anterior muscles.
• To assess the impact of operator experience and intermaxillary relationship conditions on measurement variability.

Main Methods:

• Investigated five volunteers using surface electromyography (sEMG) with the BIO-PAK system.
• Tested three muscles (masseter, temporalis anterior, digastric anterior) under three intermaxillary conditions: resting, centric occlusion (C.O.), and maximum voluntary clench.
• Data analyzed using factorial variance analysis, comparing operator variability across two experimental trials with varying operator experience.

Main Results:

• Statistically significant differences in measurements were observed only in the initial trial, attributed to operator inexperience.
• No significant differences were found in the second trial after operators performed at least 30 measurements each.
• The electromyographic system and protocol demonstrated good measurement reproducibility.

Conclusions:

• The employed surface electromyography system and protocol ensure reliable and reproducible measurements of masticatory muscle activity.
• The findings support the potential clinical and research applications of this sEMG methodology.
• Operator training and experience significantly influence the reliability of sEMG data in dental and neurological assessments.