Gait stability, variability and complexity on inclined surfaces

Marcus Fraga Vieira; Fábio Barbosa Rodrigues; Gustavo Souto de Sá e Souza; R.M. Magnani; Georgia Cristina Lehnen; Natalia  Guimarães Campos; Adriano O.  Andrade

doi:10.1016/j.jbiomech.2017.01.045

Gait stability, variability and complexity on inclined surfaces

Marcus Fraga Vieira, Fábio Barbosa Rodrigues, Gustavo Souto de Sá e Souza, R.M. Magnani, Georgia Cristina Lehnen, Natalia Guimarães Campos, Adriano O. Andrade

Biomechanics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

This study evaluated the gait stability, variability, and complexity of healthy young adults on inclined surfaces. A total of 49 individuals walked on a treadmill at their preferred speed for 4min at inclinations of 6%, 8%, and 10% in upward (UP) and downward (DOWN) conditions, and in horizontal (0%) condition. Gait variability was assessed using average standard deviation trunk acceleration between strides (VAR), gait stability was assessed using margin of stability (MoS) and maximum Lyapunov exponent (λs), and gait complexity was assessed using sample entropy (SEn). Trunk variability (VAR) increased in the medial-lateral (ML), anterior-posterior, and vertical directions for all inclined conditions. The SEn values indicated that movement complexity decreased almost linearly from DOWN to UP conditions, reflecting changes in gait pattern with longer and slower steps as inclination increased. The DOWN conditions were associated with the highest variability and lowest stability in the MoS ML, but not in λs. Stability was lower in UP conditions, which exhibited the largest λs values. The overall results support the hypothesis that inclined surfaces decrease gait stability and alter gait variability, particularly in UP conditions.

Original language	English
Article number	0.1016/j.jbiomech.2017.01.045
Pages (from-to)	73-79
Number of pages	7
Journal	Journal of Biomechanics
Volume	54
DOIs	https://doi.org/10.1016/j.jbiomech.2017.01.045
Publication status	Published - 21 Mar 2017

Funding

The authors are thankful to brazilian governmental agencies CAPES, CNPq, FAPEG, and FAPEMIG for supporting this study.

Funders	Funder number
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Fundação de Amparo à Pesquisa do Estado de Goiás

Access to Document

10.1016/j.jbiomech.2017.01.045

Persistent URL (handle)

Copy link address

Cite this

@article{ef0b818fb4de4220a1b55a4c2748aa81,

title = "Gait stability, variability and complexity on inclined surfaces",

abstract = "This study evaluated the gait stability, variability, and complexity of healthy young adults on inclined surfaces. A total of 49 individuals walked on a treadmill at their preferred speed for 4min at inclinations of 6%, 8%, and 10% in upward (UP) and downward (DOWN) conditions, and in horizontal (0%) condition. Gait variability was assessed using average standard deviation trunk acceleration between strides (VAR), gait stability was assessed using margin of stability (MoS) and maximum Lyapunov exponent (λs), and gait complexity was assessed using sample entropy (SEn). Trunk variability (VAR) increased in the medial-lateral (ML), anterior-posterior, and vertical directions for all inclined conditions. The SEn values indicated that movement complexity decreased almost linearly from DOWN to UP conditions, reflecting changes in gait pattern with longer and slower steps as inclination increased. The DOWN conditions were associated with the highest variability and lowest stability in the MoS ML, but not in λs. Stability was lower in UP conditions, which exhibited the largest λs values. The overall results support the hypothesis that inclined surfaces decrease gait stability and alter gait variability, particularly in UP conditions.",

author = "{Fraga Vieira}, Marcus and {Barbosa Rodrigues}, F{\'a}bio and {Souto de S{\'a} e Souza}, Gustavo and R.M. Magnani and Lehnen, {Georgia Cristina} and {Guimar{\~a}es Campos}, Natalia and Andrade, {Adriano O.}",

year = "2017",

month = mar,

day = "21",

doi = "10.1016/j.jbiomech.2017.01.045",

language = "English",

volume = "54",

pages = "73--79",

journal = "Journal of Biomechanics",

issn = "0021-9290",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Gait stability, variability and complexity on inclined surfaces

AU - Fraga Vieira, Marcus

AU - Barbosa Rodrigues, Fábio

AU - Souto de Sá e Souza, Gustavo

AU - Magnani, R.M.

AU - Lehnen, Georgia Cristina

AU - Guimarães Campos, Natalia

AU - Andrade, Adriano O.

PY - 2017/3/21

Y1 - 2017/3/21

N2 - This study evaluated the gait stability, variability, and complexity of healthy young adults on inclined surfaces. A total of 49 individuals walked on a treadmill at their preferred speed for 4min at inclinations of 6%, 8%, and 10% in upward (UP) and downward (DOWN) conditions, and in horizontal (0%) condition. Gait variability was assessed using average standard deviation trunk acceleration between strides (VAR), gait stability was assessed using margin of stability (MoS) and maximum Lyapunov exponent (λs), and gait complexity was assessed using sample entropy (SEn). Trunk variability (VAR) increased in the medial-lateral (ML), anterior-posterior, and vertical directions for all inclined conditions. The SEn values indicated that movement complexity decreased almost linearly from DOWN to UP conditions, reflecting changes in gait pattern with longer and slower steps as inclination increased. The DOWN conditions were associated with the highest variability and lowest stability in the MoS ML, but not in λs. Stability was lower in UP conditions, which exhibited the largest λs values. The overall results support the hypothesis that inclined surfaces decrease gait stability and alter gait variability, particularly in UP conditions.

AB - This study evaluated the gait stability, variability, and complexity of healthy young adults on inclined surfaces. A total of 49 individuals walked on a treadmill at their preferred speed for 4min at inclinations of 6%, 8%, and 10% in upward (UP) and downward (DOWN) conditions, and in horizontal (0%) condition. Gait variability was assessed using average standard deviation trunk acceleration between strides (VAR), gait stability was assessed using margin of stability (MoS) and maximum Lyapunov exponent (λs), and gait complexity was assessed using sample entropy (SEn). Trunk variability (VAR) increased in the medial-lateral (ML), anterior-posterior, and vertical directions for all inclined conditions. The SEn values indicated that movement complexity decreased almost linearly from DOWN to UP conditions, reflecting changes in gait pattern with longer and slower steps as inclination increased. The DOWN conditions were associated with the highest variability and lowest stability in the MoS ML, but not in λs. Stability was lower in UP conditions, which exhibited the largest λs values. The overall results support the hypothesis that inclined surfaces decrease gait stability and alter gait variability, particularly in UP conditions.

UR - http://www.scopus.com/inward/record.url?scp=85013655722&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85013655722&partnerID=8YFLogxK

U2 - 10.1016/j.jbiomech.2017.01.045

DO - 10.1016/j.jbiomech.2017.01.045

M3 - Article

SN - 0021-9290

VL - 54

SP - 73

EP - 79

JO - Journal of Biomechanics

JF - Journal of Biomechanics

M1 - 0.1016/j.jbiomech.2017.01.045

ER -

Gait stability, variability and complexity on inclined surfaces

Abstract

Funding

Access to Document

Persistent URL (handle)

Other files and links

Fingerprint

Cite this