Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals
ObjectiveThis study was to investigate alterations in contractile properties of the ankle plantar- and dorsiflexors in post-stroke individuals. The correlation between muscle architecture parameters and contractile properties was also evaluated.MethodsEight post-stroke individuals and eight age-matc...
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Frontiers Media S.A.
2024-11-01
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| Series: | Frontiers in Bioengineering and Biotechnology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fbioe.2024.1453604/full |
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| author | Ruoli Wang Longbin Zhang Hoor Jalo Olga Tarassova Gaia Valentina Pennati Anton Arndt Anton Arndt |
| author_facet | Ruoli Wang Longbin Zhang Hoor Jalo Olga Tarassova Gaia Valentina Pennati Anton Arndt Anton Arndt |
| author_sort | Ruoli Wang |
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| description | ObjectiveThis study was to investigate alterations in contractile properties of the ankle plantar- and dorsiflexors in post-stroke individuals. The correlation between muscle architecture parameters and contractile properties was also evaluated.MethodsEight post-stroke individuals and eight age-matched healthy subjects participated in the study. Participants were instructed to perform maximal isometric contraction (MVC) of ankle plantar- and dorsiflexors at four ankle angles, and isokinetic concentric contraction at two angular velocities. B-mode ultrasound images of gastrocnemius medialis (GM) and tibialis anterior (TA) were collected simultaneously during the MVC and isokinetic measurements. Individualized torque-angle and torque-angular velocity relations were established by fitting the experimental data using a second-order polynomial and a rectangular hyperbola function, respectively. Muscle structure parameters, such as fascicle length, muscle thickness and pennation angle of the GM and TA muscles were quantified.ResultsPost-stroke subjects had significantly smaller ankle plantarflexor and dorsiflexor torques. The muscle structure parameters also showed a significant change in the stroke group, but no significant difference was observed in the TA muscle. A narrowed parabolic shape of the ankle PF torque-fiber length profile with a lower width span was also found in the stroke group.ConclusionThis study showed that the contractile properties and architecture of ankle muscles in post-stroke individuals undergo considerable changes that may directly contribute to muscle weakness, decreased range of motion, and impaired motion function in individuals after stroke. |
| format | Article |
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| issn | 2296-4185 |
| language | English |
| publishDate | 2024-11-01 |
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| spelling | doaj-art-d8ca8ff88e6247bca0dbcc08caebfd372025-08-20T02:22:40ZengFrontiers Media S.A.Frontiers in Bioengineering and Biotechnology2296-41852024-11-011210.3389/fbioe.2024.14536041453604Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individualsRuoli Wang0Longbin Zhang1Hoor Jalo2Olga Tarassova3Gaia Valentina Pennati4Anton Arndt5Anton Arndt6KTH MoveAbility Lab, Department of Engineering Mechanics, KTH Royal Institute of Technology, Stockholm, SwedenKTH MoveAbility Lab, Department of Engineering Mechanics, KTH Royal Institute of Technology, Stockholm, SwedenKTH MoveAbility Lab, Department of Engineering Mechanics, KTH Royal Institute of Technology, Stockholm, SwedenBiomechanics and Motor Control Laboratory, Swedish School of Sport and Health Sciences, Stockholm, SwedenDepartment of Clinical Sciences, Danderyd Hospital, Division of Rehabilitation Medicine, Karolinska Institutet, Stockholm, SwedenBiomechanics and Motor Control Laboratory, Swedish School of Sport and Health Sciences, Stockholm, SwedenDepartment CLINTEC, Karolinska Institute, Stockholm, SwedenObjectiveThis study was to investigate alterations in contractile properties of the ankle plantar- and dorsiflexors in post-stroke individuals. The correlation between muscle architecture parameters and contractile properties was also evaluated.MethodsEight post-stroke individuals and eight age-matched healthy subjects participated in the study. Participants were instructed to perform maximal isometric contraction (MVC) of ankle plantar- and dorsiflexors at four ankle angles, and isokinetic concentric contraction at two angular velocities. B-mode ultrasound images of gastrocnemius medialis (GM) and tibialis anterior (TA) were collected simultaneously during the MVC and isokinetic measurements. Individualized torque-angle and torque-angular velocity relations were established by fitting the experimental data using a second-order polynomial and a rectangular hyperbola function, respectively. Muscle structure parameters, such as fascicle length, muscle thickness and pennation angle of the GM and TA muscles were quantified.ResultsPost-stroke subjects had significantly smaller ankle plantarflexor and dorsiflexor torques. The muscle structure parameters also showed a significant change in the stroke group, but no significant difference was observed in the TA muscle. A narrowed parabolic shape of the ankle PF torque-fiber length profile with a lower width span was also found in the stroke group.ConclusionThis study showed that the contractile properties and architecture of ankle muscles in post-stroke individuals undergo considerable changes that may directly contribute to muscle weakness, decreased range of motion, and impaired motion function in individuals after stroke.https://www.frontiersin.org/articles/10.3389/fbioe.2024.1453604/fulltorque-angle relationshiptorque-angular velocity relationfascicle lengthmuscle thicknesspennation angleultrasound |
| spellingShingle | Ruoli Wang Longbin Zhang Hoor Jalo Olga Tarassova Gaia Valentina Pennati Anton Arndt Anton Arndt Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals Frontiers in Bioengineering and Biotechnology torque-angle relationship torque-angular velocity relation fascicle length muscle thickness pennation angle ultrasound |
| title | Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals |
| title_full | Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals |
| title_fullStr | Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals |
| title_full_unstemmed | Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals |
| title_short | Individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post-stroke individuals |
| title_sort | individualized muscle architecture and contractile properties of ankle plantarflexors and dorsiflexors in post stroke individuals |
| topic | torque-angle relationship torque-angular velocity relation fascicle length muscle thickness pennation angle ultrasound |
| url | https://www.frontiersin.org/articles/10.3389/fbioe.2024.1453604/full |
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