Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment

Several previous studies investigated comfort while soaking in hot bathwater from the perspective of thermal effects or physiology. However, few studies investigated bathing comfort from the perspective of biomechanics, although the biomechanical state in bathing, such as buoyancy on a human and the...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Ryota NAKAMURA, Tomohisa KATO, Minoru SATO, Takanao FUJII, Motomu NAKASHIMA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	biomechanics soaking posture joint torque passive elastic joint moment bathtub buoyancy Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/830c4a390b84467bbf2a1ae26730dd50
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:830c4a390b84467bbf2a1ae26730dd50
record_format	dspace
spelling	oai:doaj.org-article:830c4a390b84467bbf2a1ae26730dd502021-11-26T07:20:09ZEvaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment2187-974510.1299/mej.18-00006https://doaj.org/article/830c4a390b84467bbf2a1ae26730dd502018-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/3/5_18-00006/_pdf/-char/enhttps://doaj.org/toc/2187-9745Several previous studies investigated comfort while soaking in hot bathwater from the perspective of thermal effects or physiology. However, few studies investigated bathing comfort from the perspective of biomechanics, although the biomechanical state in bathing, such as buoyancy on a human and the degree of muscle contraction is expected to be changed according to soaking postures. Indeed, only a few studies from the biomechanical viewpoint provided biomechanical models. In addition, the provide models were insufficient to discuss biomechanical loads in detail. The objective of this study was to evaluate soaking postures considering the effects of buoyancy, muscle contraction and passive elastic joint moment from the perspective of biomechanics and to evaluate biomechanical loads in detail. Soaking postures and reaction forces from the bathtub to a human were measured for ten healthy male participants and under two bathtub conditions (recent bathtub and conventional one). A three-dimensional motion analysis system and waterproofed three-dimensional force plates were used to measure the experimental data. A biomechanical model in which a human body was represented as a link of body segments was constructed. The torque due to buoyancy and passive elastic joint moment were considered in the model. The result showed that all the torque components due to buoyancy, gravity, reaction forces, and passive elastic joint moment contributed to the joint torques and each torque component was changed between bathtub conditions. In addition, joint torques on the ankle and knee joints in the recent bathtub were significantly smaller than those in the conventional bathtub. These results suggested that the bathing posture in the recent bathtub was more comfortable than that in the conventional one. Furthermore, the difference in joint torques between bathtub conditions suggested a potential benefit for designing bathtub shape, in which know-how of developers or subjective assessment is relied previously, with quantifying from biomechanical viewpoint.Ryota NAKAMURATomohisa KATOMinoru SATOTakanao FUJIIMotomu NAKASHIMAThe Japan Society of Mechanical Engineersarticlebiomechanicssoaking posturejoint torquepassive elastic joint momentbathtubbuoyancyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 3, Pp 18-00006-18-00006 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	biomechanics soaking posture joint torque passive elastic joint moment bathtub buoyancy Mechanical engineering and machinery TJ1-1570
spellingShingle	biomechanics soaking posture joint torque passive elastic joint moment bathtub buoyancy Mechanical engineering and machinery TJ1-1570 Ryota NAKAMURA Tomohisa KATO Minoru SATO Takanao FUJII Motomu NAKASHIMA Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
description	Several previous studies investigated comfort while soaking in hot bathwater from the perspective of thermal effects or physiology. However, few studies investigated bathing comfort from the perspective of biomechanics, although the biomechanical state in bathing, such as buoyancy on a human and the degree of muscle contraction is expected to be changed according to soaking postures. Indeed, only a few studies from the biomechanical viewpoint provided biomechanical models. In addition, the provide models were insufficient to discuss biomechanical loads in detail. The objective of this study was to evaluate soaking postures considering the effects of buoyancy, muscle contraction and passive elastic joint moment from the perspective of biomechanics and to evaluate biomechanical loads in detail. Soaking postures and reaction forces from the bathtub to a human were measured for ten healthy male participants and under two bathtub conditions (recent bathtub and conventional one). A three-dimensional motion analysis system and waterproofed three-dimensional force plates were used to measure the experimental data. A biomechanical model in which a human body was represented as a link of body segments was constructed. The torque due to buoyancy and passive elastic joint moment were considered in the model. The result showed that all the torque components due to buoyancy, gravity, reaction forces, and passive elastic joint moment contributed to the joint torques and each torque component was changed between bathtub conditions. In addition, joint torques on the ankle and knee joints in the recent bathtub were significantly smaller than those in the conventional bathtub. These results suggested that the bathing posture in the recent bathtub was more comfortable than that in the conventional one. Furthermore, the difference in joint torques between bathtub conditions suggested a potential benefit for designing bathtub shape, in which know-how of developers or subjective assessment is relied previously, with quantifying from biomechanical viewpoint.
format	article
author	Ryota NAKAMURA Tomohisa KATO Minoru SATO Takanao FUJII Motomu NAKASHIMA
author_facet	Ryota NAKAMURA Tomohisa KATO Minoru SATO Takanao FUJII Motomu NAKASHIMA
author_sort	Ryota NAKAMURA
title	Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
title_short	Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
title_full	Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
title_fullStr	Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
title_full_unstemmed	Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
title_sort	evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/830c4a390b84467bbf2a1ae26730dd50
work_keys_str_mv	AT ryotanakamura evaluationofsoakingposturesinbathwaterusingabiomechanicalmodelconsideringbuoyancyandpassiveelasticjointmoment AT tomohisakato evaluationofsoakingposturesinbathwaterusingabiomechanicalmodelconsideringbuoyancyandpassiveelasticjointmoment AT minorusato evaluationofsoakingposturesinbathwaterusingabiomechanicalmodelconsideringbuoyancyandpassiveelasticjointmoment AT takanaofujii evaluationofsoakingposturesinbathwaterusingabiomechanicalmodelconsideringbuoyancyandpassiveelasticjointmoment AT motomunakashima evaluationofsoakingposturesinbathwaterusingabiomechanicalmodelconsideringbuoyancyandpassiveelasticjointmoment
_version_	1718409667611197440

Evaluation of soaking postures in bathwater using a biomechanical model considering buoyancy and passive elastic joint moment

Ejemplares similares