Comparison of gait velocity and center of mass acceleration under conditions of disrupted somatosensory input from the feet during the navigation of obstacles in older adults with good and poor visual acuity

Shin, Seung-je; An, Duk-Hyun; Yoo, Won-gyu

doi:10.1016/j.eurger.2014.11.002

Cited by 7 publications

(15 citation statements)

References 29 publications

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“…Previous studies have shown that visual function deficits impact gait in older adults and PD (Spaulding et al ., ; Geldmacher, ; Hallemans et al ., ; Swigler et al ., ; Elliott, ; Shin et al ., ). However such studies tend to alter the visual environment (e.g.…”

Section: Discussionmentioning

confidence: 97%

“…Visual deficits are also common in PD and range from impaired visual functions such as visual acuity (VA) and contrast sensitivity (CS) to more complex processes such as depth or motion perception (Weil et al ., ). Emerging evidence has also shown that visual dysfunction is associated with gait impairment (Spaulding et al ., ; Swigler et al ., ; Shin et al ., ) and manipulation of vision through environmental changes negatively impacts gait in PD (Azulay et al ., ; Davidsdottir et al ., ; Cowie et al ., ; Lebold & Almeida, ).…”

Section: Introductionmentioning

confidence: 99%

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Direct and indirect effects of attention and visual function on gait impairment in Parkinson's disease: influence of task and turning

Stuart

Galna

Delicato

et al. 2017

Eur J of Neuroscience

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Gait impairment is a core feature of Parkinson's disease (PD) which has been linked to cognitive and visual deficits, but interactions between these features are poorly understood. Monitoring saccades allows investigation of real-time cognitive and visual processes and their impact on gait when walking. This study explored: (i) saccade frequency when walking under different attentional manipulations of turning and dual-task; and (ii) direct and indirect relationships between saccades, gait impairment, vision and attention. Saccade frequency (number of fast eye movements per-second) was measured during gait in 60 PD and 40 agematched control participants using a mobile eye-tracker. Saccade frequency was significantly reduced in PD compared to controls during all conditions. However, saccade frequency increased with a turn and decreased under dual-task for both groups. Poorer attention directly related to saccade frequency, visual function and gait impairment in PD, but not controls. Saccade frequency did not directly relate to gait in PD, but did in controls. Instead, saccade frequency and visual function deficit indirectly impacted gait impairment in PD, which was underpinned by their relationship with attention. In conclusion, our results suggest a vital role for attention with direct and indirect influences on gait impairment in PD. Attention directly impacted saccade frequency, visual function and gait impairment in PD, with connotations for falls. It also underpinned indirect impact of visual and saccadic impairment on gait. Attention therefore represents a key therapeutic target that should be considered in future research.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of attention and visual function on gait impairment in Parkinson's disease: influence of task and turning

Stuart

Galna

Delicato

et al. 2017

Eur J of Neuroscience

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“…The COM acceleration is a commonly-used parameter to indicate stability [22, 25], while step width is a controversial stability indicator which is discussed below. The proposed COM- FCP inclination angle was developed based on the COM-ankle inclination angle, so the COM-ankle inclination angle was analyzed as a contrast.…”

Section: Discussionmentioning

confidence: 99%

“…They have been reported to be indicative of the body’s balance alone [11, 25]. The COM-ankle inclination angle indicated the motion of COM relative to the ankle marker during single stance phase, which considered the COM and BOS together [21].…”

Section: Discussionmentioning

confidence: 99%

Comparison of the COM-FCP inclination angle and other mediolateral stability indicators for turning

Wang

Yang

et al. 2017

BioMed Eng OnLine

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BackgroundStudies have shown that turning is associated with more instability than straight walking and instability increases with turning angles. However, the precise relationship of changes in stability with the curvature and step length of turning is not clear. The traditional center of mass (COM)-center of pressure (COP) inclination angle requires the use of force plates. A COM-foot contact point (FCP) inclination angle derived from kinematic data is proposed in this study as a measure of the stability of turning.MethodsIn order to generate different degrees of stability, we designed an experiment of walking with different curvatures and step lengths. Simultaneously, a novel method was proposed to calculate the COM-FCP inclination angles of different walking trajectories with different step lengths for 10 healthy subjects. The COM-FCP inclination angle, the COM acceleration, the step width and the COM-ankle inclination angles were statistically analyzed.ResultsThe statistical results showed that the mediolateral (ML) COM-FCP inclination angles increased significantly as the curvature of the walking trajectories or the step length in circular walking increased. Changes in the ML COM acceleration, the step width and the ML COM-ankle inclination angle verified the feasibility and reliability of the proposed method. Additionally, the ML COM-FCP inclination angle was more sensitive to the ML stability than the ML COM-ankle inclination angle.ConclusionsThe work suggests that it is more difficult to keep balance when walking in a circular trajectory with a larger curvature or in a larger step length. Essentially, turning with a larger angle in one step leads to a lower ML stability. A novel COM-FCP inclination angle was validated to indicate ML stability. This method can be applied to complicated walking tasks, where the force plate is not applicable, and it accounts for the variability of the base of support (BOS) compared to the COM-ankle inclination angle.

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“…A sensor range of −2 to +2 g was applied for the present study. The accelerometer was attached over the L3 spinous process using double‐sided adhesive tape [28]. An additional accelerometer with a hand switch was used by the investigator to divide the path traveled into 3 stages (straight, turning, and return straight).…”

Section: Methodsmentioning

confidence: 99%

Effects of Balance Control Through Trunk Movement During Square and Semicircular Turns on Gait Velocity, Center of Mass Acceleration, and Energy Expenditure in Older Adults

Shin

Yoo

2016

PM&R

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Comparison of gait velocity and center of mass acceleration under conditions of disrupted somatosensory input from the feet during the navigation of obstacles in older adults with good and poor visual acuity

Cited by 7 publications

References 29 publications

Direct and indirect effects of attention and visual function on gait impairment in Parkinson's disease: influence of task and turning

Direct and indirect effects of attention and visual function on gait impairment in Parkinson's disease: influence of task and turning

Comparison of the COM-FCP inclination angle and other mediolateral stability indicators for turning

Effects of Balance Control Through Trunk Movement During Square and Semicircular Turns on Gait Velocity, Center of Mass Acceleration, and Energy Expenditure in Older Adults

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