Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.

The purpose of this study was to investigate the effects of different vertical positions of an asymmetrical load on the anticipatory postural adjustments phase of gait initiation. Sixty-eight college students (32 males, 36 females; age: 23.65 ± 3.21 years old; weight: 69.98 ± 8.15 kg; height: 1.74 ±...

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Autores principales:	Marcus Fraga Vieira, Fábio Barbosa Rodrigues, Alfredo de Oliveira Assis, Eduardo de Mendonça Mesquita, Thiago Santana Lemes, Guilherme Augusto Gomes De Villa, Rafael Reimann Baptista, Adriano de Oliveira Andrade, Paula Hentschel Lobo da Costa
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/61927d0a778a41e281118ee653782996
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spelling	oai:doaj.org-article:61927d0a778a41e281118ee6537829962021-11-25T06:23:34ZEffects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.1932-620310.1371/journal.pone.0242892https://doaj.org/article/61927d0a778a41e281118ee6537829962021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0242892https://doaj.org/toc/1932-6203The purpose of this study was to investigate the effects of different vertical positions of an asymmetrical load on the anticipatory postural adjustments phase of gait initiation. Sixty-eight college students (32 males, 36 females; age: 23.65 ± 3.21 years old; weight: 69.98 ± 8.15 kg; height: 1.74 ± 0.08 m) were enrolled in the study. Ground reaction forces and moments were collected using two force platforms. The participants completed three trials under each of the following random conditions: no-load (NL), waist uniformly distributed load (WUD), shoulder uniformly distributed load (SUD), waist stance foot load (WST), shoulder stance foot load (SST), waist swing foot load (WSW), and shoulder swing foot load (SSW). The paired Hotelling's T-square test was used to compare the experimental conditions. The center of pressure (COP) time series were significantly different for the SUD vs. NL, SST vs. NL, WST vs. NL, and WSW vs. NL comparisons. Significant differences in COP time series were observed for all comparisons between waist vs. shoulder conditions. Overall, these differences were greater when the load was positioned at the shoulders. For the center of mass (COM) time series, significant differences were found for the WUD vs. NL and WSW vs. NL conditions. However, no differences were observed with the load positioned at the shoulders. In conclusion, only asymmetrical loading at the waist produced significant differences, and the higher the extra load, the greater the effects on COP behavior. By contrast, only minor changes were observed in COM behavior, suggesting that the changes in COP (the controller) behavior are adjustments to maintain the COM (controlled object) unaltered.Marcus Fraga VieiraFábio Barbosa RodriguesAlfredo de Oliveira AssisEduardo de Mendonça MesquitaThiago Santana LemesGuilherme Augusto Gomes De VillaRafael Reimann BaptistaAdriano de Oliveira AndradePaula Hentschel Lobo da CostaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0242892 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marcus Fraga Vieira Fábio Barbosa Rodrigues Alfredo de Oliveira Assis Eduardo de Mendonça Mesquita Thiago Santana Lemes Guilherme Augusto Gomes De Villa Rafael Reimann Baptista Adriano de Oliveira Andrade Paula Hentschel Lobo da Costa Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.
description	The purpose of this study was to investigate the effects of different vertical positions of an asymmetrical load on the anticipatory postural adjustments phase of gait initiation. Sixty-eight college students (32 males, 36 females; age: 23.65 ± 3.21 years old; weight: 69.98 ± 8.15 kg; height: 1.74 ± 0.08 m) were enrolled in the study. Ground reaction forces and moments were collected using two force platforms. The participants completed three trials under each of the following random conditions: no-load (NL), waist uniformly distributed load (WUD), shoulder uniformly distributed load (SUD), waist stance foot load (WST), shoulder stance foot load (SST), waist swing foot load (WSW), and shoulder swing foot load (SSW). The paired Hotelling's T-square test was used to compare the experimental conditions. The center of pressure (COP) time series were significantly different for the SUD vs. NL, SST vs. NL, WST vs. NL, and WSW vs. NL comparisons. Significant differences in COP time series were observed for all comparisons between waist vs. shoulder conditions. Overall, these differences were greater when the load was positioned at the shoulders. For the center of mass (COM) time series, significant differences were found for the WUD vs. NL and WSW vs. NL conditions. However, no differences were observed with the load positioned at the shoulders. In conclusion, only asymmetrical loading at the waist produced significant differences, and the higher the extra load, the greater the effects on COP behavior. By contrast, only minor changes were observed in COM behavior, suggesting that the changes in COP (the controller) behavior are adjustments to maintain the COM (controlled object) unaltered.
format	article
author	Marcus Fraga Vieira Fábio Barbosa Rodrigues Alfredo de Oliveira Assis Eduardo de Mendonça Mesquita Thiago Santana Lemes Guilherme Augusto Gomes De Villa Rafael Reimann Baptista Adriano de Oliveira Andrade Paula Hentschel Lobo da Costa
author_facet	Marcus Fraga Vieira Fábio Barbosa Rodrigues Alfredo de Oliveira Assis Eduardo de Mendonça Mesquita Thiago Santana Lemes Guilherme Augusto Gomes De Villa Rafael Reimann Baptista Adriano de Oliveira Andrade Paula Hentschel Lobo da Costa
author_sort	Marcus Fraga Vieira
title	Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.
title_short	Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.
title_full	Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.
title_fullStr	Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.
title_full_unstemmed	Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.
title_sort	effects of additional load at different heights on gait initiation: a statistical parametric mapping of center of pressure and center of mass behavior.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/61927d0a778a41e281118ee653782996
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Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior.

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