Neuromechanical Control Strategies of Frontal-Plane Angular Momentum of Human Upper Body During Locomotor Transitions

Li, Wentao; Fey, Nicholas P.

doi:10.1109/biorob.2018.8487920

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…This mechanism was similar to the previously reported control strategy of body COM in the initiation of walking direction change where the trunk was displaced to the opposite of new direction [41]. However, individuals in unanticipated sidestep transitions may easily swing the trailing leg and trunk [40] away from the leading leg direction with increased negative momentum. Thus, in response to unanticipated walking direction change crossover style may require rapid gait termination and inverted-pendulum-style trunk motion to initialize its direction change, while sidestep may take advantage of the momentum during leg swing to be a more effective maneuver for quicker changing of locomotion direction [12].…”

Section: Reactive Control Of Dynamic Balance Is Influenced By Cut Stylesupporting

confidence: 87%

“…Although these investigations did not compare different cut styles, their results support our findings that anticipatory change of dynamic balance is affected by cut style, but not the direction. Furthermore, these adjustments of whole-body angular momentum may partially result from preparatory control of trunk angular momentum that had the same modification strategy as H [40]. Previous study on sidestep cuts also reported that trunk swing is a strategy assisting in moving body COM toward new walking direction [41].…”

Section: Increased Task Complexity and Unanticipated State Pose Challmentioning

confidence: 94%

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Time evolution of frontal plane dynamic balance during locomotor transitions of altered anticipation and complexity

Pickle

Fey

2020

J NeuroEngineering Rehabil

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Background: Locomotor transitions between different ambulatory tasks are essential activities of daily life. During these transitions, biomechanics are affected by various factors such as anticipation, movement direction, and task complexity. These factors are thought to influence the neuromotor regulation of dynamic balance, which can be quantified using whole-body angular momentum (H). However, the specific effects of these factors on balance during transitions are not well understood. The ability to regulate dynamic balance in the presence of these contextual factors is especially important in the frontal plane, as it is usually challenging to maintain walking balance in the frontal plane for individuals with neuromuscular impairments. The purpose of this study was to apportion their effects on the time evolution of frontal plane dynamic balance during locomotor transitions of healthy, unimpaired individuals. Methods: Five healthy young subjects performed 10 separate types of transitions with discrete combinations of factors including complexity (straight walking, cuts, combined cut/stair ascent), cut style (crossover, sidestep), and anticipation (anticipated and unanticipated). A three-way analysis of variance (ANOVA) was used to compare the maxima, minima, and average rates of change of frontal-plane H among all transitions. Results: Before transition, within anticipated state peak value of H increased 307% in crossover style relative to sidestep style (p < 0.0001). During Transition Phase, within unanticipated state the magnitudes of average rate of change and peak value increased 70 and 46% in sidestep style compared to crossover style (p < 0.0001 and p = 0.0003). Within sidestep style, they increased in unanticipated state relative to anticipated state. Later in Correction Phase, within both anticipation states peak value of H increased 41 and 75% in cut/stairs transitions relative to cuts (p = 0.010 and p < 0.0001). For cut/stairs transitions, peak value of H increased 45% in unanticipated state compared to anticipated state (p = 0.0001).

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Section: Reactive Control Of Dynamic Balance Is Influenced By Cut Stylesupporting

confidence: 87%

Section: Increased Task Complexity and Unanticipated State Pose Challmentioning

confidence: 94%

Time evolution of frontal plane dynamic balance during locomotor transitions of altered anticipation and complexity

Pickle

Fey

2020

J NeuroEngineering Rehabil

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“…In the recovery step, the correlation strength between frontal iWBAM and step width went up for later onset times, though the correlation strengths were weaker than those seen for the perturbed step for earlier perturbation onset times. The weaker correlations across onset times in the recovery step could be due to the participant having ample time to employ other strategies in combination with step placement, such as lateral ankle strategy ( Hof et al, 2010 ) or using arm ( Collins et al, 2009 ; Gholizadeh et al, 2019 ) or torso counter-rotation ( Li and Fey, 2018 ) to induce momentum changes. However, this does not imply that those other strategies are not being used on the perturbed step; on the contrary, lateral ankle strategy is faster acting, as the participant does not have to wait until the subsequent heel contact to employ it ( Reimann et al, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

Linking whole-body angular momentum and step placement during perturbed human walking

Leestma

Golyski

Smith

et al. 2023

Journal of Experimental Biology

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Human locomotion is remarkably robust to environmental disturbances. Previous studies have thoroughly investigated how perturbations influence body dynamics and what recovery strategies are used to regain balance. Fewer studies have attempted to establish formal links between balance and the recovery strategies that are executed to regain stability. We hypothesized that there would be a strong relationship between magnitude of imbalance and recovery strategy during perturbed walking. To test this hypothesis, we applied transient ground surface translations that varied in magnitude, direction, and onset time while eight healthy participants walked on a treadmill. We measured stability using integrated whole-body angular momentum (iWBAM) and recovery strategy using step placement. We found the strongest relationships between iWBAM and step placement in the frontal plane for earlier perturbation onset times in the perturbed step (R2=0.52, 0.50) and later perturbation onset times in the recovery step (R2=0.18, 0.25), while correlations were very weak in the sagittal plane (all R2 <= 0.13). These findings suggest that iWBAM influences step placement, particularly in the frontal plane, and that this influence is sensitive to perturbation onset time. Lastly, this investigation is accompanied by an open-source data set to facilitate research on balance and recovery strategies in response to multifactorial ground surface perturbations, including 96 perturbation conditions spanning all combinations of three magnitudes, eight directions, and four gait cycle onset times.

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Body Segment Mechanical Signal Contributions to Continuous Prediction of Locomotor Transitions Performed under Varying Anticipation

Kazemimoghadam

Fey

2019

2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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Neuromechanical Control Strategies of Frontal-Plane Angular Momentum of Human Upper Body During Locomotor Transitions

Cited by 7 publications

References 23 publications

Time evolution of frontal plane dynamic balance during locomotor transitions of altered anticipation and complexity

Time evolution of frontal plane dynamic balance during locomotor transitions of altered anticipation and complexity

Linking whole-body angular momentum and step placement during perturbed human walking

Body Segment Mechanical Signal Contributions to Continuous Prediction of Locomotor Transitions Performed under Varying Anticipation

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