Comparison of fascicle behaviors between superficial and deeper muscles of triceps brachii during isometric contractions |
| |
| Institution: | 1. National Health and Medical Research Council Centres for Clinical Research Excellence (Spinal Pain, Injury, and Health), The University of Queensland, Brisbane, Australia;2. School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia;3. Department of Physiotherapy, Royal Brisbane and Women''s Hospital, Queensland Health, Queensland, Australia;4. University of Queensland, School of Biomedical Sciences, University of Queensland, Australia;5. Clinical Informatics Directorate, Metro South Health, Brisbane, Australia;6. Australian Centre for Health Services Innovation and Centre for Healthcare Transformation, School of Public Health & Social Work, Queensland University of Technology, Brisbane, Australia;7. Department of Health, Medicine and Caring Sciences, Physiotherapy, Linköping University, Linköping, Sweden |
| |
| Abstract: | PurposeWe assessed fascicle behaviors of the upper extremities during isometric contractions at different joint angles in this study.MethodsThirteen healthy men and women performed isometric elbow extension tasks at 50% and 75% of maximal voluntary contraction (MVC) at 60°, 90°, and 120° of elbow extension (full extension = 180°). Extended field-of-view B-mode ultrasonography was used to obtain sagittal plane panoramic images of the long head (TB-Long) and medial head (TB-Med) of the triceps brachii at rest and during contraction; fascicle length and pennation angle were measured.ResultsIn the TB-Long, significant fascicle shortening from rest was found during 50% and 75%MVC at 60° and during 75%MVC at 90° of extension. There was no significant fascicle shortening in the TB-Med muscle under any conditions. There was no significant pennation angle change from rest in either muscle. The pennation angle of the TB-Long was significantly greater than that of the TB-Med under all conditions.ConclusionsThese results suggest that fascicle shortening in the TB-Long muscle occurs in flexion; however, no change was found in the TB-Med. In the upper extremity muscle–tendon complex, the superficial and deeper muscles may have different force-transmission efficiency at flexed joint angles. |
| |
| Keywords: | Fascicle behavior Triceps brachii Ultrasonography Panoramic imaging |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
