Model-based assessments of the effects of age and ankle fatigue on the control of upright posture in humans

Qu, Xingda; Nussbaum, Maury A.; Madigan, Michael L.

doi:10.1016/j.gaitpost.2009.07.127

Cited by 23 publications

(17 citation statements)

References 33 publications

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“…These results are in accordance with previous studies reporting impaired bipedal postural control following fatiguing exercise of the plantar-flexor muscle, with a similar order of magnitude (e.g. [6,[14][15][16][17][18][19]). …”

Section: Discussionsupporting

confidence: 93%

“…Generally, these studies reported a deterioration of bipedal postural control (e.g. [6,[13][14][15][16][17][18][19]), which has been suggested to stem from an alteration of ankle proprioceptive acuity [20,21] and an inability to produce or sustain required force output with the fatigued plantar-flexor muscle.…”

Section: Introductionmentioning

confidence: 99%

“…It was hypothesised that the destabilizing effect of plantar-flexor muscle fatigue (e.g. [13][14][15][16][17][18][19]) would be exacerbated under altered foot and ankle sensory conditions and mitigated under improved foot and ankle sensory conditions. The present study investigated the effects of somatosensory conditions at the foot and ankle on postural responses to plantar-flexor muscle fatigue during bipedal quiet stance.…”

Section: Introductionmentioning

confidence: 99%

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Do somatosensory conditions from the foot and ankle affect postural responses to plantar-flexor muscles fatigue during bipedal quiet stance?

Hlavackova

Vuillerme

2012

Gait & Posture

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Do somatosensory conditions from the foot and ankle affect postural responses to plantar-flexor muscles fatigue during bipedal quiet stance?

Hlavackova

Vuillerme

2012

Gait & Posture

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“…Model-based simulations to investigate how and why age and localised muscle fatigue affect postural control and fall risks 54 Industrial ergonomics "Application of ergonomics data and principles for improving safety, productivity and quality of work in industry"…”

Section: Fiction: Human Factors Is Focused Only On Individualsmentioning

confidence: 99%

The science of human factors: separating fact from fiction

et al. 2013

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BackgroundInterest in human factors has increased across healthcare communities and institutions as the value of human centred design in healthcare becomes increasingly clear. However, as human factors is becoming more prominent, there is growing evidence of confusion about human factors science, both anecdotally and in scientific literature. Some of the misconceptions about human factors may inadvertently create missed opportunities for healthcare improvement.MethodsThe objective of this article is to describe the scientific discipline of human factors and provide common ground for partnerships between healthcare and human factors communities.ResultsThe primary goal of human factors science is to promote efficiency, safety and effectiveness by improving the design of technologies, processes and work systems. As described in this article, human factors also provides insight on when training is likely (or unlikely) to be effective for improving patient safety. Finally, we outline human factors specialty areas that may be particularly relevant for improving healthcare delivery and provide examples to demonstrate their value.ConclusionsThe human factors concepts presented in this article may foster interdisciplinary collaborations to yield new, sustainable solutions for healthcare quality and patient safety.

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“…Expanding on our prior work (Qu et al 2007(Qu et al , 2009Qu andNussbaum 2009a, 2009b), we described human body dynamics in the model by a two-segment inverted pendulum in 3D space. Sensory systems were assumed to provide accurate ankle and hip angles to the neural controller but with an inherent time delay due to sensory processing, transduction and transmission (van der Kooij et al 1999).…”

Section: Methodsmentioning

confidence: 99%

Modelling 3D control of upright stance using an optimal control strategy

Nussbaum

2012

Computer Methods in Biomechanics and Biomedical Engineering

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A 3D balance control model of quiet upright stance is presented, based on an optimal control strategy, and evaluated in terms of its ability to simulate postural sway in both the anterior-posterior and medial-lateral directions. The human body was represented as a two-segment inverted pendulum. Several assumptions were made to linearise body dynamics, for example, that there was no transverse rotation during upright stance. The neural controller was presumed to be an optimal controller that generates ankle control torque and hip control torque according to certain performance criteria. An optimisation procedure was used to determine the values of unspecified model parameters including random disturbance gains and sensory delay times. This model was used to simulate postural sway behaviours characterised by centre-of-pressure (COP)-based measures. Confidence intervals for all normalised COP-based measures contained unity, indicating no significant differences between any of the simulated COP-based measures and corresponding experimental references. In addition, mean normalised errors for the traditional measures were < 8%, and those for most statistical mechanics measures were ∼3-66%. On the basis these results, the proposed 3D balance control model appears to have the ability to accurately simulate 3D postural sway behaviours.

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Model-based assessments of the effects of age and ankle fatigue on the control of upright posture in humans

Cited by 23 publications

References 33 publications

Do somatosensory conditions from the foot and ankle affect postural responses to plantar-flexor muscles fatigue during bipedal quiet stance?

Do somatosensory conditions from the foot and ankle affect postural responses to plantar-flexor muscles fatigue during bipedal quiet stance?

The science of human factors: separating fact from fiction

Modelling 3D control of upright stance using an optimal control strategy

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