Kinematic analysis of step ascent among patients with central visual field loss

Timmis, Matthew A.; Scarfe, Amy C.; Tabrett, Daryl R.; Pardhan, Shahina

doi:10.1016/j.gaitpost.2013.07.115

Cited by 17 publications

(16 citation statements)

References 22 publications

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“…Cuando las PDV se enfrentaron a situaciones como subir gradas o realizar cambios de dirección, propiciaron adaptaciones a la caminata como mayor duración en el apoyo de doble soporte, es decir, más tiempo con los pies juntos; una rotación externa del pie, lo que brinda un apoyo más amplio; un control anticipatorio, referente a la exploración o adelantamiento del pie para saber que hay adelante en su recorrido (aumentando, el ángulo de extensión del tobillo), logrando así, protección a la integridad física. También, se puede mencionar que, al aumentar la dificultad de la caminata, ya sea con sonidos ambientales o con la resolución de tareas, el ritmo disminuye al compararlo con un traslado en línea recta y sin obstáculos (Larsson & Frändin 2006;Timmis et al, 2014).…”

Section: Discussionunclassified

“…Se concluye que existe poca evidencia de estudios experimentales que incluyan caminar como variable; por otro lado, se muestra que las PDV, presentan diferencias significativas al compararlos con personas con visión normal. En donde se detectaron marchas atípicas en PDV, en algunos casos mostraron grandes rangos de movimientos articular, como el tobillo, o por el contrario, movimientos pequeños cómo en la cabeza y la pelvis, también, mayor flexión de tronco y cabeza, indicando poca economía y técnica en los movimientos, por lo que se realizan de forma forzada, ejerciendo mayor estrés muscular y óseo (Gazzellini et al, 2016;Patla, 1997;Timmis et al, 2014). Otros aspectos como el frenado, la propulsión, la fuerza de reacción en el suelo de las PDV no son congruentes en los estudios (Mason et al, 2005.;Ray et al, 2007;Timmis et al, 2014), por lo que se sugiere como variables en estudios futuros.…”

Section: Conclusiónunclassified

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Marcha en personas con discapacidad visual: Revisión de literatura

Ramírez¹

2019

MHSalud

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Caminar para las personas con discapacidad visual (PDV) presenta diversas variaciones que afectan su funcionalidad y su salud, especialmente, porque afecta al sistema músculo esquelético. Propósito: realizar una revisión de literatura para analizar el patrón de la caminata, así como las implicaciones que esta tiene en individuos de baja visión y ceguera. Método: para la obtención de información de la revisión de literatura sistemática, se buscaron artículos científicos en las bases de datos que a continuación se mencionan: SportDiscus con texto completo, psycINFO, Psychology and Behavioral Sciences Collection, Rehabilitation & Sports Medicine Source, google académico, Research Gate, PubMed. Resultados: las PDV, muestran una caminata cautelosa, probablemente para protegerse de las barreras arquitectónicas a las que podrían enfrentarse. Conclusiones: las PDV, presentan movimientos más cortos, lentos, lo que indica menores rangos de movimiento, afectando su funcionalidad, y generando un estrés muscular. Es muy importante la valoración de la caminata en las PDV, para que se desarrollen patrones adecuados y no presenten desbalances o acortamientos musculares. Logrando una mejora de su locomoción y con esta una mayor independencia.

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Section: Discussionunclassified

Section: Conclusiónunclassified

Marcha en personas con discapacidad visual: Revisión de literatura

Ramírez¹

2019

MHSalud

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“…To date, only two studies have investigated the movement mechanics in individuals with AMD when stepping up or down to a new level ( Alexander et al, 2014 ; Timmis et al, 2014 ). These studies demonstrated that when stepping up to a new level, individuals with AMD adopted a slower (and by implication more cautious) gait speed compared to those with normal vision.…”

Section: Introductionmentioning

confidence: 99%

The effects of age and central field loss on maintaining balance control when stepping up to a new level under time-pressure

Zult

Timmis

Pardhan

2023

PeerJ

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Objective To investigate the effects of age and central field loss on the landing mechanics and balance control when stepping up to a new level under time-pressure. Methods Eight older individuals with age-related macular degeneration (AMD), eight visually normal older and eight visually normal younger individuals negotiated a floor-based obstacle followed by a ‘step-up to a new level’ task. The task was performed under (1) no-pressure; (2) time-pressure: an intermittent tone was played that increased in frequency and participants had to complete the task before the tone ceased. Landing mechanics and balance control for the step-up task was assessed with a floor-mounted force plate on the step. Results Increased ground reaction forces and loading rates were observed under time-pressure for young and older visual normals but not for AMD participants. Across conditions, loading rates and ground reaction forces were higher in young normals compared to older normals and AMD participants. Young visual normals also demonstrated 35–39% shorter double support times prior to and during the step-up compared to older normals and AMD participants. All groups shortened their double support times (31–40%) and single support times (7–9%) in the time-pressure compared to no-pressure condition. Regarding balance control, the centre-of-pressure displacement and velocity in the anterior-poster direction were increased under time-pressure for young and older visual normals but not for AMD participants. The centre-of-pressure displacement and velocity in the medial-lateral direction were decreased for the AMD participants under time-pressure but not for young and older visual normals. Conclusions Despite walking faster, AMD participants did not adapt their landing mechanics under time-pressure (i.e., they remained more cautious), whilst older and young adults with normal vision demonstrated more forceful landing mechanics with the young being most forceful. A more controlled landing might be a safety strategy to maintain balance control during the step-up, especially in time-pressure conditions when balance control in the anterior-posterior direction is more challenged.

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“…The effect of vision impairment on obstacle negotiation and step ascent has also been widely studied 16–18 . Compared to age-matched controls, subjects with central vision loss due to age-related macular degeneration (AMD) lifted both feet higher and slower over the obstacle 17 and exhibited a slower lead foot crossing velocity and swing time during step ascent 18 . Thus, the kinematic assessment of obstacle crossing and step ascent can help to detect changes in adaptive gait that are related to deficits in sensorimotor integration.…”

Section: Introductionmentioning

confidence: 99%

A low-cost 2-D video system can accurately and reliably assess adaptive gait kinematics in healthy and low vision subjects

Zult

Allsop

Tabernero

et al. 2019

Sci Rep

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3-D gait analysis is the gold standard but many healthcare clinics and research institutes would benefit from a system that is inexpensive and simple but just as accurate. The present study examines whether a low-cost 2-D motion capture system can accurately and reliably assess adaptive gait kinematics in subjects with central vision loss, older controls, and younger controls. Subjects were requested to walk up and step over a 10 cm high obstacle that was positioned in the middle of a 4.5 m walkway. Four trials were simultaneously recorded with the Vicon motion capture system (3-D system) and a video camera that was positioned perpendicular to the obstacle (2-D system). The kinematic parameters (crossing height, crossing velocity, foot placement, single support time) were calculated offline. Strong Pearson’s correlations were found between the two systems for all parameters (average r = 0.944, all p < 0.001). Bland-Altman analysis showed that the agreement between the two systems was good in all three groups after correcting for systematic biases related to the 2-D marker positions. The test-retest reliability for both systems was high (average ICC = 0.959). These results show that a low-cost 2-D video system can reliably and accurately assess adaptive gait kinematics in healthy and low vision subjects.

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Kinematic analysis of step ascent among patients with central visual field loss

Cited by 17 publications

References 22 publications

Marcha en personas con discapacidad visual: Revisión de literatura

Marcha en personas con discapacidad visual: Revisión de literatura

The effects of age and central field loss on maintaining balance control when stepping up to a new level under time-pressure

A low-cost 2-D video system can accurately and reliably assess adaptive gait kinematics in healthy and low vision subjects

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