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van Mierlo, Michelle (author), Ormiston, Jean A. (author), Vlutters, Mark (author), Van Asseldonk, Edwin H.F. (author), van der Kooij, H. (author)Increasing knowledge on human balance recovery strategies is important for the development of balance assistance strategies using assistive devices like a powered lower-limb exoskeleton. One of the postures which is relevant for this scenario, but underexposed in research, is staggered stance, a posture with one foot in front. We therefore aimed...journal article 2023
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van Mierlo, M. (author), Vlutters, M. (author), van Asseldonk, E. H.F. (author), van der Kooij, H. (author)Spatiotemporal gait characteristics change during very slow walking, a relevant speed considering individuals with movement disorders or using assistive devices. However, we lack insights in how very slow walking affects human balance control. Therefore, we aimed to identify how healthy individuals use balance strategies while walking very...journal article 2023
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Moya-Esteban, A. (author), Durandau, G. (author), van der Kooij, H. (author), Sartori, M. (author)Lumbar joint compression forces have been linked to the development of chronic low back pain, which is specially present in occupational environments. Offline methodologies for lumbosacral joint compression force estimation are not commonly integrated in occupational or medical applications due to the highly time-consuming and complex post...journal article 2023
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Afschrift, M. (author), van Asseldonk, E. (author), van Mierlo, M. (author), Bayon, C. (author), Keemink, A. (author), D’Hondt, L. (author), van der Kooij, H. (author), De Groote, F. (author)Background: 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. Methods: Humans restore balance after a perturbation by adjusting activity of the muscles...journal article 2023
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van Mierlo, M. (author), Abma, M. (author), Vlutters, M. (author), van Asseldonk, E. H.F. (author), van der Kooij, H. (author)Humans prioritize regulation of the whole-body angular momentum (WBAM) during walking. When perturbed, modulations of the moment arm of the ground reaction force (GRF) with respect to the centre of mass (CoM) assist in recovering WBAM. For sagittal-plane perturbations of the WBAM given at toe off right (TOR), horizontal GRF modulations and...journal article 2023
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Rampeltshammer, Wolfgang (author), Keemink, Arvid (author), Sytsma, Menno (author), van Asseldonk, Edwin (author), van der Kooij, H. (author)Series elastic actuators (SEA) with their inherent compliance offer a safe torque source for robots that are interacting with various environments, including humans. These applications have high requirements for the SEA torque controllers, both in the torque response as well as interaction behavior with its environment. To differentiate state...journal article 2023
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Rodriguez Hernandez, K.E. (author), de Groot, J.H. (author), Baas, Frank (author), Stijntjes, M. (author), Grootendorst, E.R.M. (author), Schiemanck, S.K. (author), van der Helm, F.C.T. (author), van der Kooij, H. (author), Mugge, W. (author)Individuals with an upper motor neuron syndrome, e.g., stroke survivors, may have a pathological increase of passive ankle stiffness due to spasticity, that impairs ankle function and activities such as walking. To improve mobility, walking aids such as ankle-foot orthoses and orthopaedic shoes are prescribed. However, these walking aids...journal article 2023
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Filius, S.J. (author), Janssen, Mariska (author), van der Kooij, H. (author), Harlaar, J. (author)People with severe muscle weakness in the upper extremity are in need of an arm support to enhance arm function and improve their quality of life. In addition to weight support, compensation of passive joint impedance (pJimp) seems necessary. Existing devices do not compensate for pJimp yet, and the best way to compensate for it is still unknown...conference paper 2023
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van’t Veld, Ronald C. (author), Flux, Eline (author), van Oorschot, Wieneke (author), Schouten, A.C. (author), van der Krogt, Marjolein M. (author), van der Kooij, H. (author), Vos-van der Hulst, Marije (author), Keijsers, Noël L.W. (author), van Asseldonk, Edwin H.F. (author)Background: Spasticity, i.e. stretch hyperreflexia, increases joint resistance similar to symptoms like hypertonia and contractures. Botulinum neurotoxin-A (BoNT-A) injections are a widely used intervention to reduce spasticity. BoNT-A effects on spasticity are poorly understood, because clinical measures, e.g. modified Ashworth scale (MAS),...journal article 2023
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Haarman, Claudia J.W. (author), Hekman, Edsko E.G. (author), Rietman, Johan S. (author), van der Kooij, H. (author)In this paper we presented the mechanical design and evaluation of a low-profile and lightweight exoskeleton that supports the finger extension of stroke patients during daily activities without applying axial forces to the finger. The exoskeleton consists of a flexible structure that is secured to the index finger of the user while the thumb...journal article 2023
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van Mierlo, M. (author), Ambrosius, J. I. (author), Vlutters, M. (author), van Asseldonk, E. H.F. (author), van der Kooij, H. (author)Healthy individuals highly regulate their whole body angular momentum (WBAM) during walking. Since WBAM regulation is essential in maintaining balance, a better understanding is required on how healthy individuals recover from WBAM perturbations. We therefore studied how healthy individuals recover WBAM in the sagittal plane. WBAM can be...journal article 2022
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Moya-Esteban, A. (author), van der Kooij, H. (author), Sartori, M. (author)Low back joint compression forces have been linked to the development of chronic back pain. Back-support exoskeletons controllers based on low back compression force estimates could potentially reduce the incidence of chronic pain. However, progress has been hampered by the lack of robust and accurate methods for compression force estimation....journal article 2022
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Bayón, Cristina (author), Keemink, Arvid Q.L. (author), van Mierlo, Michelle (author), Rampeltshammer, Wolfgang (author), van der Kooij, H. (author), van Asseldonk, Edwin H.F. (author)BACKGROUND: In the last two decades, lower-limb exoskeletons have been developed to assist human standing and locomotion. One of the ongoing challenges is the cooperation between the exoskeleton balance support and the wearer control. Here we present a cooperative ankle-exoskeleton control strategy to assist in balance recovery after...journal article 2022
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van der Kooij, H. (author), Fricke, Simone S. (author), Van 't Veld, Ronald C. (author), Prieto, Ander Vallinas (author), Keemink, Arvid Q.L. (author), Schouten, A.C. (author), Van Asseldonk, Edwin H.F. (author)Knowledge on joint impedance during walking in various conditions is relevant for clinical decision-making and the development of robotic gait trainers, leg prostheses, leg orthotics and wearable exoskeletons. Whereas ankle impedance during walking has been experimentally assessed, knee and hip joint impedance during walking have not been...journal article 2022
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van ’t Veld, Ronald C. (author), Fricke, S. S. (author), Prieto, Ander Vallinas (author), Keemink, Arvid Q.L. (author), Schouten, A.C. (author), van der Kooij, H. (author), van Asseldonk, E. H.F. (author)Joint impedance plays an important role in postural control and movement. However, current experimental knowledge on lower limb impedance during gait is limited to the ankle joint. We designed the LOwer limb PERturbator (LOPER) aimed to assess knee and hip joint impedance during gait. The LOPER applies force perturbations with a 39 Hz...book chapter 2022
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van 't Veld, Ronald (author), Flux, Eline (author), Schouten, A.C. (author), van der Krogt, Marjolein (author), van der Kooij, H. (author), Van Asseldonk, Edwin H.F. (author)People with spasticity, i.e., stretch hyperreflexia, have a limited functional independence and mobility. While a broad range of spasticity treatments is available, many treatments are invasive, non-specific, or temporary and might have negative side effects. Operant conditioning of the stretch reflex is a promising non-invasive paradigm with...journal article 2021
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van ’t Veld, Ronald C. (author), Schouten, A.C. (author), van der Kooij, H. (author), van Asseldonk, Edwin H.F. (author)Background: People with brain or neural injuries, such as cerebral palsy or spinal cord injury, commonly have joint hyper-resistance. Diagnosis and treatment of joint hyper-resistance is challenging due to a mix of tonic and phasic contributions. The parallel-cascade (PC) system identification technique offers a potential solution to...journal article 2021
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Veld, Ronald C.Van T. (author), Asseldonk, Edwin H.F.Van (author), van der Kooij, H. (author), Schouten, A.C. (author)Motorized assessment of the stretch reflex is instrumental to gain understanding of the stretch reflex, its physiological origin and to differentiate effects of neurological disorders, like spasticity. Both short-latency (M1) and medium-latency (M2) stretch reflexes have been reported to depend on the velocity and acceleration of an applied...journal article 2021
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van Mierlo, M. (author), Vlutters, M. (author), van Asseldonk, E. H.F. (author), van der Kooij, H. (author)Centre of mass (CoM) motion during human balance recovery is largely influenced by the ground reaction force (GRF) and the centre of pressure (CoP). During gait, foot placement creates a region of possible CoP locations in the following double support (DS). This study aims to increase insight into how humans modulate the CoP during DS, and...journal article 2021
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Meijneke, C. (author), van Oort, G. (author), Sluiter, V. (author), van Asseldonk, E. (author), Tagliamonte, N. L. (author), Tamburella, F. (author), Pisotta, I. (author), Masciullo, M. (author), Arquilla, M. (author), Molinari, M. (author), Wu, A. R. (author), Dzeladini, F. (author), Ijspeert, A. J. (author), van der Kooij, H. (author)In this paper, we present the design, control, and preliminary evaluation of the Symbitron exoskeleton, a lower limb modular exoskeleton developed for people with a spinal cord injury. The mechanical and electrical configuration and the controller can be personalized to accommodate differences in impairments among individuals with spinal cord...journal article 2021