Maarten Afschrift
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View article: Benchmarking the predictive capability of human gait simulations
Benchmarking the predictive capability of human gait simulations Open
Physics-based simulation generate movement patterns based on a neuro-musculoskeletal model without relying on experimental movement data, offering a powerful approach to study how neuro-musculoskeletal properties shape locomotion. Yet, sim…
View article: Transtibial amputation increases the metabolic energy needed for stabilizing walking in the sagittal plane
Transtibial amputation increases the metabolic energy needed for stabilizing walking in the sagittal plane Open
Walking energy consumption is higher in people with versus without a transtibial amputation, but the underlying reasons are poorly understood. Active prostheses that restore ankle power fail to decrease walking energy consumption, suggesti…
View article: Feasibility and safety of automated multi-channel FES-assisted gait training in incomplete spinal cord injury
Feasibility and safety of automated multi-channel FES-assisted gait training in incomplete spinal cord injury Open
Objective: The feasibility, safety, and efficacy of automated multi-channel functional electrical stimulation-assisted gait training was assessed in individuals with chronic incomplete spinal cord injury, using an electrical stimulation su…
View article: Speeding up, not slowing down, decreases the energy needed to control walking balance
Speeding up, not slowing down, decreases the energy needed to control walking balance Open
There is a metabolic cost associated with controlling walking balance but it remains unclear to what extent sagittal plane balance control contributes to this cost. Furthermore, sagittal plane balance control strategies vary with speed but…
View article: Optimal Lower Limb Exoskeleton Assistance in Walking Predicted by Musculoskeletal Simulation
Optimal Lower Limb Exoskeleton Assistance in Walking Predicted by Musculoskeletal Simulation Open
View article: Benchmarking the predictive capability of human gait simulations
Benchmarking the predictive capability of human gait simulations Open
Physics-based simulation generate movement patterns based on a neuro-musculoskeletal model without relying on experimental movement data, offering a powerful approach to study how neuro-musculoskeletal properties shape locomotion. Yet, sim…
View article: Insights into muscle metabolic energetics: Modelling muscle-tendon mechanics and metabolic rates during walking across speeds
Insights into muscle metabolic energetics: Modelling muscle-tendon mechanics and metabolic rates during walking across speeds Open
The metabolic energy rate of individual muscles is impossible to measure without invasive procedures. Prior studies have produced models to predict metabolic rates based on experimental observations of isolated muscle contraction from vari…
View article: Springs vs. motors: Ideal assistance in the lower limbs during walking at different speeds
Springs vs. motors: Ideal assistance in the lower limbs during walking at different speeds Open
Recent years have witnessed breakthroughs in assistive exoskeletons; both passive and active devices have reduced metabolic costs near preferred walking speed by assisting muscle actions. Metabolic reductions at multiple speeds should thus…
View article: PredSim: A Framework for Rapid Predictive Simulations of Locomotion
PredSim: A Framework for Rapid Predictive Simulations of Locomotion Open
Predictive simulations are a powerful tool for advancing our understanding of the neuromechanics of movement. By generating gait patterns using a (neuro-) musculoskeletal model, without relying on motion capture data, we can study the infl…
View article: Assisting Global Balance Recovery Responses During Perturbed Walking with Ankle Exoskeletons
Assisting Global Balance Recovery Responses During Perturbed Walking with Ankle Exoskeletons Open
While ankle exoskeleton research has mainly focused on reducing metabolic energy consumption, recent studies also aimed to support walking balance which is also important for individuals with mobility impairments that typically have an inc…
View article: Experiment-guided tuning of muscle–tendon parameters to estimate muscle fiber lengths and passive forces
Experiment-guided tuning of muscle–tendon parameters to estimate muscle fiber lengths and passive forces Open
View article: Assessment of stabilizing feedback control of walking: A tutorial
Assessment of stabilizing feedback control of walking: A tutorial Open
Walking without falling requires stabilization of the trajectory of the body center of mass relative to the base of support. Model studies suggest that this requires active, feedback control, i.e., the nervous system must process sensory i…
View article: A dynamic foot model for predictive simulations of human gait reveals causal relations between foot structure and whole-body mechanics
A dynamic foot model for predictive simulations of human gait reveals causal relations between foot structure and whole-body mechanics Open
The unique structure of the human foot is seen as a crucial adaptation for bipedalism. The foot’s arched shape enables stiffening the foot to withstand high loads when pushing off, without compromising foot flexibility. Experimental studie…
View article: Springs vs. motors: Ideal assistance in the lower limbs during walking at different speeds
Springs vs. motors: Ideal assistance in the lower limbs during walking at different speeds Open
Recent years have witnessed breakthroughs in assistive exoskeletons; both passive and active devices have reduced metabolic costs near preferred walking speed by assisting muscle actions. Metabolic reductions at multiple speeds should thus…
View article: Insights into muscle metabolic energetics: Modelling muscle-tendon mechanics and metabolic rates during walking across speeds
Insights into muscle metabolic energetics: Modelling muscle-tendon mechanics and metabolic rates during walking across speeds Open
Prior studies have produced models to predict metabolic rates based on experimental observations of isolated muscle contraction from various species. Such models can provide reliable predictions of metabolic rates in humans if muscle prope…
View article: ASSESSMENT OF STABILIZING FEEDBACK CONTROL OF WALKING, A TUTORIAL
ASSESSMENT OF STABILIZING FEEDBACK CONTROL OF WALKING, A TUTORIAL Open
Walking without falling requires stabilization of the trajectory of the body center of mass relative to the base of support. Model studies suggest that this requires active, feedback control, i.e., the nervous system must process sensory i…
View article: Assisting walking balance using a bio-inspired exoskeleton controller
Assisting walking balance using a bio-inspired exoskeleton controller Open
View article: A dynamic foot model for predictive simulations of gait reveals causal relations between foot structure and whole body mechanics
A dynamic foot model for predictive simulations of gait reveals causal relations between foot structure and whole body mechanics Open
The unique structure of the human foot is seen as a crucial adaptation for bipedalism. Its arched shape makes it possible to stiffen the foot to withstand high loads when pushing off, without compromising the range of motion. Experimental …
View article: Accuracy-speed-stability trade-offs in a targeted stepping task are similar in young and older adults
Accuracy-speed-stability trade-offs in a targeted stepping task are similar in young and older adults Open
Introduction Stepping accuracy, speed, and stability are lower in older compared to young adults. Lower stepping performance in older adults may be due to larger accuracy-speed-stability trade-offs because of reduced ability to simultaneou…
View article: Experiment-Guided Calibration of Muscle Fiber Lengths and Passive Forces
Experiment-Guided Calibration of Muscle Fiber Lengths and Passive Forces Open
View article: Accuracy-speed-stability trade-offs in a targeted stepping task are similar in young and older adults
Accuracy-speed-stability trade-offs in a targeted stepping task are similar in young and older adults Open
Background Stepping accuracy, speed, and stability are lower in older compared to young adults. Lower stepping performance in older adults may be due to larger accuracy-speed-stability trade-offs because of reduced ability to simultaneousl…
View article: Assisting walking balance using a bio-inspired exoskeleton controller
Assisting walking balance using a bio-inspired exoskeleton controller Open
Balance control is important for mobility, yet exoskeleton research has mainly focused on improving metabolic energy efficiency. Here we present a biomimetic exoskeleton controller that supports walking balance and reduces muscle activity.…
View article: Evaluation of musculoskeletal models, scaling methods, and performance criteria for estimating muscle excitations and fiber lengths across walking speeds
Evaluation of musculoskeletal models, scaling methods, and performance criteria for estimating muscle excitations and fiber lengths across walking speeds Open
Muscle-driven simulations have been widely adopted to study muscle-tendon behavior; several generic musculoskeletal models have been developed, and their biofidelity improved based on available experimental data and computational feasibili…
View article: Age-related balance difficulties during shoulder checks increase cycling risk in older adults
Age-related balance difficulties during shoulder checks increase cycling risk in older adults Open
Older adults are more often involved in bike accidents than other age groups, especially in single-sided accidents (crashes without another road user). This suggests that older adults have more difficulty maintaining balance while cycling,…
View article: Modeling toes contributes to realistic stance knee mechanics in three-dimensional predictive simulations of walking
Modeling toes contributes to realistic stance knee mechanics in three-dimensional predictive simulations of walking Open
Physics-based predictive simulations have been shown to capture many salient features of human walking. Yet they often fail to produce realistic stance knee and ankle mechanics. While the influence of the performance criterion on the predi…
View article: Adaptations in Reactive Balance Strategies in Healthy Older Adults After a 3-Week Perturbation Training Program and After a 12-Week Resistance Training Program
Adaptations in Reactive Balance Strategies in Healthy Older Adults After a 3-Week Perturbation Training Program and After a 12-Week Resistance Training Program Open
Both resistance training (RT) and perturbation-based training (PBT) have been proposed and applied as interventions to improve reactive balance performance in older adults. PBT is a promising approach but the adaptations in underlying bala…
View article: Modeling toes contributes to realistic stance knee mechanics in three-dimensional predictive simulations of walking
Modeling toes contributes to realistic stance knee mechanics in three-dimensional predictive simulations of walking Open
Physics-based predictive simulations have been shown to capture many salient features of human walking. Yet they often fail to produce realistic stance knee mechanics and terminal stance ankle plantarflexion. While the influence of the per…
View article: Similar sensorimotor transformations control balance during standing and walking
Similar sensorimotor transformations control balance during standing and walking Open
Standing and walking balance control in humans relies on the transformation of sensory information to motor commands that drive muscles. Here, we evaluated whether sensorimotor transformations underlying walking balance control can be desc…
View article: Similar sensorimotor transformations control balance during standing and walking
Similar sensorimotor transformations control balance during standing and walking Open
Standing and walking balance control in humans relies on the transformation of sensory information to motor commands that drive muscles. Here, we evaluated whether sensorimotor transformations underlying walking balance control can be desc…
View article: Can Momentum-Based Control Predict Human Balance Recovery Strategies?
Can Momentum-Based Control Predict Human Balance Recovery Strategies? Open
Human-like balance controllers are desired for wearable exoskeletons in order to enhance human-robot interaction. Momentum-based controllers (MBC) have been successfully applied in bipeds, however, it is unknown to what degree they are abl…