External abdominal oblique muscle ultrasonographic thickness changes is not an appropriate surrogate measure of electromyographic activity during isometric trunk contractions
| Autor: | Rubens Alexandre da Silva, Dany H. Gagnon, Christian Larivière, Philippe Paquette, Lucas Maciel Rabello |
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| Rok vydání: | 2015 |
| Předmět: |
Adult
Male medicine.medical_specialty Lateral flexion Surrogate measure Physical Therapy Sports Therapy and Rehabilitation Muscle Strength Dynamometer Electromyography Isometric exercise Sitting Physical medicine and rehabilitation Isometric Contraction medicine Humans Orthopedics and Sports Medicine Abdominal Muscles Ultrasonography medicine.diagnostic_test business.industry Rehabilitation Biomechanics Oblique case musculoskeletal system Trunk body regions business |
| Zdroj: | Journal of Back and Musculoskeletal Rehabilitation. 28:229-238 |
| ISSN: | 1878-6324 1053-8127 |
| DOI: | 10.3233/bmr-140508 |
| Popis: | BACKGROUND The function of specific abdominal muscles can be assessed using both electromyography (EMG) and ultrasound imaging (USI) thickness measures. However, the relationship between these two measurements is not conclusive during sitting isometric trunk efforts. OBJECTIVE This study was conducted to assess the relationship between USI thickness and EMG amplitude measures of the right external oblique (EO) muscle during isometric efforts in the sitting position. METHOD Eighteen subjects performed ramp isometric efforts progressing from 0 to 50% of their maximal voluntary contraction (MVC) in three trunk directions on a dynamometer: (1) forward flexion; (2) right lateral flexion; and (3) left axial rotation. USI and surface EMG amplitude measures of the EO muscle were recorded concomitantly and both normalized against rest values and maximal EMG, respectively. RESULTS EO muscle was significantly more activated (p < 0.001) during forward flexion (42% on average) and axial rotation (35%) than during lateral flexion (24%). Non-significant (r=0.01; P=0.979) to highly significant (r=0.98; P < 0.0001) and negative and positive Pearson correlations were observed between EMG and EO thickness measures for both flexion and rotation directions. CONCLUSION The negative correlations between EMG and USI measures as well as the great variability of these correlations across individuals suggest that USI is not a valid measures of EO muscle activity. USI thickness measures should be interpreted with great caution in research and clinical settings. |
| Databáze: | OpenAIRE |
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