Strategies used to walk through a moving aperture

Cinelli, Michael E.; Patla, Aftab E.; Allard, Fran

doi:10.1016/j.gaitpost.2007.08.002

Cited by 26 publications

(26 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Perhaps 1.71 m/s was not fast enough to afford the expected locomotor adjustments. The locomotor adjustments observed in each speed condition confirm the attempt to reduce the complexity of the proposed task (Cinelli, Patla & Allard, 2008).…”

Section: Discussionsupporting

confidence: 64%

See 1 more Smart Citation

Adaptive Locomotion for Crossing a Moving Obstacle

Silva¹,

Barbieri²,

Gobbi³

2011

Motor Control

View full text Add to dashboard Cite

Crossing moving obstacles requires different space-time adjustments compared with stationary obstacles. Our aim was to investigate gait spatial and temporal parameters in the approach and crossing phases of a moving obstacle. We hypothesized that obstacle speed affects gait parameters, which allow us to distinguish locomotor strategies. Ten young adults walked and stepped over an obstacle that crossed their way perpendicularly, under three obstacle conditions: control-stationary obstacle, slow (1.07m/s) and fast speed (1.71m/s) moving obstacles. Gait parameters were different between obstacle conditions, especially on the slow speed. In the fast condition, the participants adopted predictive strategies during the approach and crossing phases. In the slow condition, they used an anticipatory strategy in both phases. We conclude that obstacle speed affects the locomotor behavior and strategies were distinct in the obstacle avoidance phases.

show abstract

Section: Discussionsupporting

confidence: 64%

“…On crossing a moving obstacle, individuals attempt to simplify the task to attain the obstacle direction (Cinelli, Patla & Allard, 2008). This task requires more sensory attention and results in decreased motor performance according to obstacle position (Gérin-Lajoie, Richards & McFadyen, 2006).…”

mentioning

confidence: 99%

Adaptive Locomotion for Crossing a Moving Obstacle

Silva¹,

Barbieri²,

Gobbi³

2011

Motor Control

View full text Add to dashboard Cite

show abstract

“…Such a functional relationship was observed even when participants were tested in a virtual reality [8], when running through apertures [4], or when older adults were tested [11]. Furthermore, other gait and posture modifications when navigating through apertures, such as changes in speed [2], [12], [13], [14] or the magnitude of deviation of the body-midline from the center of the apertures [2], [15], [16], were also well proportioned to the ratio value. These findings lead researchers to a general understanding that the perception of the ratio value be important to control gait and posture for navigating through apertures [1], [2], [6], [12].…”

Section: Introductionmentioning

confidence: 86%

Rule for Scaling Shoulder Rotation Angles while Walking through Apertures

2012

View full text Add to dashboard Cite

BackgroundWhen an individual is trying to fit into a narrow aperture, the amplitude of shoulder rotations in the yaw dimension is well proportioned to the relative aperture width to body width (referred to as the critical ratio value). Based on this fact, it is generally considered that the central nervous system (CNS) determines the amplitudes of shoulder rotations in response to the ratio value. The present study was designed to determine whether the CNS follows another rule in which a minimal spatial margin is created at the aperture passage; this rule is beneficial particularly when spatial requirements for passage (i.e., the minimum passable width) become wider than the body with an external object.Methodology/Principal FindingsEight young participants walked through narrow apertures of three widths (ratio value = 0.9, 1.0, and 1.1) while holding one of three horizontal bars (short, 1.5 and 2.5 times the body width). The results showed that the amplitude of rotation angles became smaller for the respective ratio value as the bar increased in length. This was clearly inconsistent with the general hypothesis that predicted the same rotation angles for the same ratio value. Instead, the results were better explained with a new hypothesis which predicted that a smaller rotation angle was sufficient to produce a constant spatial margin as the bar-length increased in length.ConclusionThe results show that, at least under safe circumstances, the CNS is likely to determine the amplitudes of shoulder rotations to ensure the minimal spatial margin being created at one side of the body at the time of crossing. This was new in that the aperture width subtracted from the width of the body (plus object) was taken into account for the visuomotor control of locomotion through apertures.

show abstract

“…Accidental contact in previous studies was considered to occur when fine-tuning of the walking path toward the center of an aperture was not successful [15,16]. In fact, the analysis of the deviation of the body’s midpoint from the center of an aperture showed that the deviation became larger for the 1.3 apertures for stroke fallers than for the other participant groups.…”

Section: Discussionmentioning

confidence: 99%

“…The uniqueness of this study was to test their ability to safely walk through apertures. Adaptive modification of walking through a narrow aperture includes fine-tuning the walking direction toward the center of the aperture [15,16], decrease in movement speed [17,18], and changes in body configuration such as (upper-) body rotation in the yaw dimension [17–26]. The most powerful means to avoid accidental contact is the body rotation because it effectively reduces horizontal space required for crossing.…”

Section: Introductionmentioning

confidence: 99%

Walking through Apertures in Individuals with Stroke

et al. 2017

View full text Add to dashboard Cite

ObjectiveWalking through a narrow aperture requires unique postural configurations, i.e., body rotation in the yaw dimension. Stroke individuals may have difficulty performing the body rotations due to motor paralysis on one side of their body. The present study was therefore designed to investigate how successfully such individuals walk through apertures and how they perform body rotation behavior.MethodStroke fallers (n = 10), stroke non-fallers (n = 13), and healthy controls (n = 23) participated. In the main task, participants walked for 4 m and passed through apertures of various widths (0.9–1.3 times the participant’s shoulder width). Accidental contact with the frame of an aperture and kinematic characteristics at the moment of aperture crossing were measured. Participants also performed a perceptual judgment task to measure the accuracy of their perceived aperture passability.Results and DiscussionStroke fallers made frequent contacts on their paretic side; however, the contacts were not frequent when they penetrated apertures from their paretic side. Stroke fallers and non-fallers rotated their body with multiple steps, rather than a single step, to deal with their motor paralysis. Although the minimum passable width was greater for stroke fallers, the body rotation angle was comparable among groups. This suggests that frequent contact in stroke fallers was due to insufficient body rotation. The fact that there was no significant group difference in the perceived aperture passability suggested that contact occurred mainly due to locomotor factors rather than perceptual factors. Two possible explanations (availability of vision and/or attention) were provided as to why accidental contact on the paretic side did not occur frequently when stroke fallers penetrated the apertures from their paretic side.

show abstract

Strategies used to walk through a moving aperture

Cited by 26 publications

References 17 publications

Adaptive Locomotion for Crossing a Moving Obstacle

Adaptive Locomotion for Crossing a Moving Obstacle

Rule for Scaling Shoulder Rotation Angles while Walking through Apertures

Walking through Apertures in Individuals with Stroke

Contact Info

Product

Resources

About