A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions

Abstract A new bio-mechanical model for elbow flexions is proposed to quantify the elbow torque generated as a function of the upper-arm circumferential strain and influencing factors of elbow angle and angular velocity. The upper-arm circumferential strain is used to represent the contractile inten...

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Autores principales:	Xi Wang, Xiaoming Tao, Raymond C. H. So
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ed634b43ab3e49708289c09002264e78
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spelling	oai:doaj.org-article:ed634b43ab3e49708289c09002264e782021-12-02T15:05:54ZA Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions10.1038/s41598-017-09071-x2045-2322https://doaj.org/article/ed634b43ab3e49708289c09002264e782017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09071-xhttps://doaj.org/toc/2045-2322Abstract A new bio-mechanical model for elbow flexions is proposed to quantify the elbow torque generated as a function of the upper-arm circumferential strain and influencing factors of elbow angle and angular velocity. The upper-arm circumferential strain is used to represent the contractile intensity of the dominant flexor, biceps brachii, whose behavior is described by Hill’s theory. Experiments with thirteen healthy subjects were conducted to determine the influencing factors. The temporal distributions of torque and elbow angle were measured by Biodex ®3 simultaneously, while the upper-arm circumference was obtained by a wearable anthropometric measurement device. Within the experimental range, the change of angular velocity has been found to have no effect on the torque generated. The new model was further verified experimentally with reasonable agreements obtained. The mean relative error of the torque estimated from the model is 15% and 22%, for isokinetic and isotonic flexions, respectively. The verified model establishes the relationship between the torque generated and circumference strain of the upper arm, for the first time, thus provide a scientific foundation for the anthropometric measurement technology as an alternative to sEMG for monitoring force/torque generation during elbow flexions.Xi WangXiaoming TaoRaymond C. H. SoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xi Wang Xiaoming Tao Raymond C. H. So A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions
description	Abstract A new bio-mechanical model for elbow flexions is proposed to quantify the elbow torque generated as a function of the upper-arm circumferential strain and influencing factors of elbow angle and angular velocity. The upper-arm circumferential strain is used to represent the contractile intensity of the dominant flexor, biceps brachii, whose behavior is described by Hill’s theory. Experiments with thirteen healthy subjects were conducted to determine the influencing factors. The temporal distributions of torque and elbow angle were measured by Biodex ®3 simultaneously, while the upper-arm circumference was obtained by a wearable anthropometric measurement device. Within the experimental range, the change of angular velocity has been found to have no effect on the torque generated. The new model was further verified experimentally with reasonable agreements obtained. The mean relative error of the torque estimated from the model is 15% and 22%, for isokinetic and isotonic flexions, respectively. The verified model establishes the relationship between the torque generated and circumference strain of the upper arm, for the first time, thus provide a scientific foundation for the anthropometric measurement technology as an alternative to sEMG for monitoring force/torque generation during elbow flexions.
format	article
author	Xi Wang Xiaoming Tao Raymond C. H. So
author_facet	Xi Wang Xiaoming Tao Raymond C. H. So
author_sort	Xi Wang
title	A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions
title_short	A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions
title_full	A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions
title_fullStr	A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions
title_full_unstemmed	A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions
title_sort	bio-mechanical model for elbow isokinetic and isotonic flexions
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ed634b43ab3e49708289c09002264e78
work_keys_str_mv	AT xiwang abiomechanicalmodelforelbowisokineticandisotonicflexions AT xiaomingtao abiomechanicalmodelforelbowisokineticandisotonicflexions AT raymondchso abiomechanicalmodelforelbowisokineticandisotonicflexions AT xiwang biomechanicalmodelforelbowisokineticandisotonicflexions AT xiaomingtao biomechanicalmodelforelbowisokineticandisotonicflexions AT raymondchso biomechanicalmodelforelbowisokineticandisotonicflexions
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A Bio-mechanical Model for Elbow Isokinetic and Isotonic Flexions

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