Filiz Ateş1,2, Ricardo J Andrade1,3, Sandro R Freitas3,4, François Hug1,5,6, Lilian Lacourpaille1, Raphael Gross1,7, Can A Yucesoy2, Antoine Nordez8,9. 1. Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, Université de Nantes, UFR STAPS, 25 bis Bd Guy Mollet, BP 72206, 44000, Nantes, France. 2. Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey. 3. Universidade de Lisboa, Faculdade de Motricidade Humana, Estrada da Costa, Cruz Quebrada-Dafundo, 1499-002, Lisbon, Portugal. 4. Benfica Lab, Sport Lisboa e Benfica, Lisbon, Portugal. 5. NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia. 6. Institut Universitaire de France (IUF), Paris, France. 7. Gait Analysis Laboratory, Physical and Rehabilitation Medicine Department, University Hospital of Nantes, Nantes, France. 8. Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, Université de Nantes, UFR STAPS, 25 bis Bd Guy Mollet, BP 72206, 44000, Nantes, France. antoine.nordez@univ-nantes.fr. 9. Health and Rehabilitation Research Institute, Faculty of Health and Environmental Sciences, Auckland University of Technology, Auckland, New Zealand. antoine.nordez@univ-nantes.fr.
Abstract
PURPOSE: While several studies demonstrated the occurrence of intermuscular mechanical interactions, the physiological significance of these interactions remains a matter of debate. The purpose of this study was to quantify the localized changes in the shear modulus of the gastrocnemius lateralis (GL), monoarticular dorsi- and plantar-flexor muscles induced by a change in knee angle. METHOD: Participants underwent slow passive ankle rotations at the following two knee positions: knee flexed at 90° and knee fully extended. Ultrasound shear wave elastography was used to assess the muscle shear modulus of the GL, soleus [both proximally (SOL-proximal) and distally (SOL distal)], peroneus longus (PERL), and tibialis anterior (TA). This was performed during two experimental sessions (experiment I: n = 11; experiment II: n = 10). The shear modulus of each muscle was compared between the two knee positions. RESULTS: The shear modulus was significantly higher when the knee was fully extended than when the knee was flexed (P < 0.001) for the GL (averaged increase on the whole range of motion: + 5.8 ± 1.3 kPa), SOL distal (+ 4.5 ± 1.5 kPa), PERL (+ 1.1 ± 0.7 kPa), and TA (+ 1.6 ± 1.0 kPa). In contrast, a lower SOL-proximal shear modulus (P < 0.001, - 5.9 ± 1.0 kPa) was observed. CONCLUSION: As the muscle shear modulus is linearly related to passive muscle force, these results provide evidence of a non-negligible intermuscular mechanical interaction between the human lower leg muscles during passive ankle rotations. The role of these interactions in the production of coordinated movements requires further investigation.
PURPOSE: While several studies demonstrated the occurrence of intermuscular mechanical interactions, the physiological significance of these interactions remains a matter of debate. The purpose of this study was to quantify the localized changes in the shear modulus of the gastrocnemius lateralis (GL), monoarticular dorsi- and plantar-flexor muscles induced by a change in knee angle. METHOD:Participants underwent slow passive ankle rotations at the following two knee positions: knee flexed at 90° and knee fully extended. Ultrasound shear wave elastography was used to assess the muscle shear modulus of the GL, soleus [both proximally (SOL-proximal) and distally (SOL distal)], peroneus longus (PERL), and tibialis anterior (TA). This was performed during two experimental sessions (experiment I: n = 11; experiment II: n = 10). The shear modulus of each muscle was compared between the two knee positions. RESULTS: The shear modulus was significantly higher when the knee was fully extended than when the knee was flexed (P < 0.001) for the GL (averaged increase on the whole range of motion: + 5.8 ± 1.3 kPa), SOL distal (+ 4.5 ± 1.5 kPa), PERL (+ 1.1 ± 0.7 kPa), and TA (+ 1.6 ± 1.0 kPa). In contrast, a lower SOL-proximal shear modulus (P < 0.001, - 5.9 ± 1.0 kPa) was observed. CONCLUSION: As the muscle shear modulus is linearly related to passive muscle force, these results provide evidence of a non-negligible intermuscular mechanical interaction between the human lower leg muscles during passive ankle rotations. The role of these interactions in the production of coordinated movements requires further investigation.
Authors: Can A Yucesoy; Huub Maas; Bart H F J M Koopman; Henk J Grootenboer; Peter A Huijing Journal: Med Eng Phys Date: 2005-08-15 Impact factor: 2.242
Authors: Can A Yucesoy; Eva Pontén; Francisco J Valero-Cuevas; Mark Smeulders; Ciaran Knut Simms Journal: Front Physiol Date: 2021-12-06 Impact factor: 4.566