Soleus muscle and Achilles tendon compressive stiffness is related to knee and ankle positioning |
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| Affiliation: | 1. Department of Physical Therapy, Laboratory of Clinical Biomechanics, Faculty of Medicine, University of Chile, Santiago, Chile;2. Division of Research, Devolvement and Innovation in Kinesiology, Kinesiology Unit, San José Hospital, Northern Metropolitan Health Service, Santiago, Chile;3. Carrera de Kinesiología, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Chile;4. School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Queensland, Australia;5. Department of Anatomy and Legal Medicine Faculty of Medicine, University of Chile, Chile;6. Facultad de Medicina y Ciencia, Universidad San Sebastián, Sede Los Leones, Chile;7. Exercise Intervention for Health Research Group (EXINH-RG), Department of Physiotherapy, University of Valencia, Spain;8. Escuela de Kinesiología, Facultad de Salud, Universidad Santo Tomás, Chile;1. Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada;2. Division of Research and Innovation, Canadian Memorial Chiropractic College, Toronto, ON, Canada;1. Department of Biomedical Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ, United States;2. Shirley Ryan AbilityLab (formerly the Rehabilitation Institute of Chicago), Chicago, IL, United States;3. Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States;1. Faculty of Kinesiology & Physical Education, University of Toronto, Toronto, ON, Canada;2. Department of Kinesiology & Health Sciences, University of Waterloo, Waterloo, ON, Canada;3. Division of Research and Innovation, Canadian Memorial Chiropractic College, Toronto, ON, Canada;1. Department of Electrical and Electronical Engineering, Public University of Navarra, Pamplona, Spain;2. TDN, Orthopedic Surgery and Advanced Rehabilitation Center, Clinical Research Department, Mutilva, Spain;1. Biomechanics and Movement Science, University of Delaware, Newark, DE, USA;2. Physical Therapy and Rehabilitation Department, Jouf University, Jouf, Saudi Arabia;3. Department of Mechanical Engineering, University of Delaware, Newark, DE, USA;4. Department of Mechanical Engineering, Northern Arizona University, Flagstaff, AZ, USA;5. Department of Biomedical Engineering, University of Delaware, Newark, DE, USA;6. Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA;7. Department of Physical Therapy, University of Delaware, Newark, DE, USA |
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| Abstract: | Changes in fascicle length and tension of the soleus (SOL) muscle have been observed in humans using B-mode ultrasound to examine the knee from different angles. An alternative technique of assessing muscle and tendon stiffness is myometry, which is non-invasive, accessible, and easy to use. This study aimed to estimate the compressive stiffness of the distal SOL and Achilles tendon (AT) using myometry in various knee and ankle joint positions. Twenty-six healthy young males were recruited. The Myoton-PRO device was used to measure the compressive stiffness of the distal SOL and AT in the dominant leg. The knee was measured in two positions (90° of flexion and 0° of flexion) and the ankle joint in three positions (10° of dorsiflexion, neutral position, and 30° of plantar flexion) in random order. A three-way repeated-measures ANOVA test was performed. Significant interactions were found for structure × ankle position, structure × knee position, and structure × ankle position × knee position (p < 0.05). The AT and SOL showed significant increases in compressive stiffness with knee extension over knee flexion for all tested ankle positions (p < 0.05). Changes in stiffness relating to knee positioning were larger in the SOL than in the AT (p < 0.05). These results indicate that knee extension increases the compressive stiffness of the distal SOL and AT under various ankle joint positions, with a greater degree of change observed for the SOL. This study highlights the relevance of knee position in passive stiffness of the SOL and AT. |
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| Keywords: | Myometer Myofascial force transmission Soleus Musculoskeletal Leg muscles |
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