Searched for: department:"Biomechanical%5C%2BEngineering"
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De Bruijn, E. (author), Van der Helm, F.C.T. (author), Happee, R. (author)
Background: Musculoskeletal models served to analyze head–neck motion and injury during automotive impact. Although muscle activation is known to affect the kinematic response, a model with properly validated muscle contributions does not exist to date. The goal of this study was to enhance a musculoskeletal neck model and to validate passive...
journal article 2015
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Van der Krogt, H. (author), Klomp, A. (author), De Groot, J.H. (author), De Vlugt, E. (author), Van der Helm, F.C.T. (author), Meskers, C.G.M. (author), Arendzen, J.H. (author)
Background: Understanding movement disorder after stroke and providing targeted treatment for post stroke patients requires valid and reliable identification of biomechanical (passive) and neural (active and reflexive) contributors. Aim of this study was to assess test-retest reliability of passive, active and reflexive parameters and to...
journal article 2015
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Schorsch, J.F. (author), Keemink, A.Q.L. (author), Stienen, A.H.A. (author), Van der Helm, F.C.T. (author), Abbink, D.A. (author)
The design of exoskeletons is a popular and promising area of research both for restoring lost function and rehabilitation, and for augmentation in military and industrial applications. A major practical challenge to the comfort and usability for exoskeletons is the need to avoid misalignment of the exoskeletal joint with the underlying human...
journal article 2014
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Smit, G. (author), Plettenburg, D.H. (author), Van der Helm, F.C. (author)
The goal of this study was to find an efficient method of energy transmission for application in an anthropomorphic underactuated body-powered (BP) prosthetic hand. A pulley-cable finger and a hydraulic cylinder finger were designed and tested to compare the pulley-cable transmission principle with the hydraulic cylinder transmission principle....
journal article 2014
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Van Drunen, P. (author), Maaswinkel, E. (author), Van der Helm, F.C.T. (author), Van Dieën, J.H. (author), Happee, R. (author)
Motor control deficits have been suggested as potential cause and/or effect of a-specific chronic low-back pain and its recurrent behavior. Therefore, the goal of this study is to identify motor control in low-back stabilization by simultaneously quantifying the intrinsic and reflexive contributions. Upper body sway was evoked using continuous...
journal article 2013
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Mugge, W. (author), Van der Helm, F.C.T. (author), Schouten, A.C. (author)
Complex regional pain syndrome (CRPS) is characterized by pain and disturbed blood flow, temperature regulation and motor control. Approximately 25% of cases develop fixed dystonia. The origin of this movement disorder is poorly understood, although recent insights suggest involvement of disturbed force feedback. Assessment of sensorimotor...
journal article 2013
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Asadi Nikooyan, A. (author), Veeger, H.E.J. (author), Chadwick, E.K.J. (author), Praagman, M. (author), Van der Helm, F.C.T. (author)
The Delft Shoulder and Elbow Model (DSEM), a musculoskeletal model of the shoulder and elbow has been extensively developed since its introduction in 1994. Extensions cover both model structures and anatomical data focusing on the addition of an elbow part and muscle architecture parameters. The model was also extended with a new inverse...
journal article 2011
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Forbes, P.A. (author), Happee, R. (author), Van der Helm, F.C.T. (author), Schouten, A.C. (author)
Force and position perturbations are widely applied to identify muscular and reflexive contributions to posture maintenance of the arm. Both task instruction (force vs. position) and the inherently linked perturbation type (i.e., force perturbations-position task and position perturbations-force tasks) affect these contributions and their mutual...
journal article 2011
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Munts, A.G. (author), Mugge, W. (author), Meurs, T.S. (author), Schouten, A.C. (author), Marinus, J. (author), Lorimer Moseley, G. (author), Van der Helm, F.C.T. (author), Van Hilten, J.J. (author)
Background: Complex regional pain syndrome (CRPS) may occur after trauma, usually to one limb, and is characterized by pain and disturbed blood flow, temperature regulation and motor control. Approximately 25% of cases develop fixed dystonia. Involvement of dysfunctional GABAergic interneurons has been suggested, however the mechanisms that...
journal article 2011
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Asadi Nikooyan, A. (author), Van der Helm, F.C.T. (author), Westerhoff, P. (author), Graichen, F. (author), Bergmann, G. (author), Veeger, H.E.J. (author)
Determination of an accurate glenohumeral-joint rotation center (GH-JRC) from marker data is essential for kinematic and dynamic analysis of shoulder motions. Previous studies have focused on the evaluation of the different functional methods for the estimation of the GH-JRC for healthy subjects. The goal of this paper is to compare two widely...
journal article 2011
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Schutte, S. (author), Geukers, E.B.M. (author), Simonsz, H.J. (author), Van der Helm, F.C.T. (author)
Apparatus and method for automatically determining a strabismus angle of the eyes of an individual by performing a reflection test on said eyes, comprising the steps of : -directing at least a first beam of light onto said eyes of the individual; -having the individual focus its eyes; -using at least one imaging device for: measuring the light...
patent 2011
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Schuurmans, J. (author), Van der Helm, F.C.T. (author), Schouten, A.C. (author)
During posture control, reflexive feedback allows humans to efficiently compensate for unpredictable mechanical disturbances. Although reflexes are involuntary, humans can adapt their reflexive settings to the characteristics of the disturbances. Reflex modulation is commonly studied by determining reflex gains: a set of parameters that quantify...
journal article 2010
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De Vlugt, E. (author), De Groot, J.H. (author), Schenkeveld, K.E. (author), Arendzen, J.H. (author), Van der Helm, F.C.T. (author), Meskers, C.G.M. (author)
Quantifying increased joint resistance into its contributing factors i.e. stiffness and viscosity ("hypertonia") and stretch reflexes ("hyperreflexia") is important in stroke rehabilitation. Existing clinical tests, such as the Ashworth Score, do not permit discrimination between underlying tissue and reflexive (neural) properties. We propose an...
journal article 2010
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Mulder, M. (author), Abbink, D. (author), Van Paassen, R. (author), Mulder, M. (author), Van der Helm, F. (author), Boer, E.R. (author), Takada, Y. (author)
A target-travel-path generating circuit calculates a target travel path along which the controlled object can travel in the future from the current controlled object position, an ideal-control-signal calculating circuit calculates a control profile S to travel along the target travel path P, and a difference calculating circuit calculates a...
patent 2010
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Van der Meer, J.N. (author), Schouten, A.C. (author), Bour, L.J. (author), De Vlugt, E. (author), Van Rootselaar, A.F. (author), Van der Helm, F.C.T. (author), Tijssen, M.A.J. (author)
In dystonia, both sensory malfunctioning and an abnormal intermuscular low-frequency drive of 3–7 Hz have been found, although cause and eVect are unknown. It is hypothesized that sensory processing is primarily disturbed and induces this drive. Accordingly, experimenter-controlled sensory input should be able to inXuence the frequency of the...
journal article 2010
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Mugge, W. (author), Abbink, D.A. (author), Schouten, A.C. (author), Dewald, J.P.A. (author), Van der Helm, F.C.T. (author)
This study aims to quantify the separate contributions of muscle force feedback, muscle spindle activity and co-contraction to the performance of voluntary tasks (‘‘reduce the influence of perturbations on maintained force or position’’). Most human motion control studies either isolate only one contributor, or assume that relevant reflexive...
journal article 2009
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Meskers, C.G.M. (author), Schouten, A.C. (author), De Groot, J.H. (author), De Vlugt, E. (author), Van Hilten, B.J.J. (author), Van der Helm, F.C.T. (author), Arendzen, H.J.H. (author)
Background Instead of hyper-reflexia as sole paradigm, post-stroke movement disorders are currently considered the result of a complex interplay between neuronal and muscular properties, modified by level of activity. We used a closed loop system identification technique to quantify individual contributors to wrist joint stiffness during an...
journal article 2009
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Verdaasdonk, B.W. (author), Koopman, H.F.J.M. (author), Van der Helm, F.C.T. (author)
Like human walking, passive dynamic walking—i.e. walking down a slope with no actuation except gravity—is energy efficient by exploiting the natural dynamics. In the animal world, neural oscillators termed central pattern generators (CPGs) provide the basic rhythm for muscular activity in locomotion. We present a CPG model, which automatically...
journal article 2009
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Mugge, W. (author), Schuurmans, J. (author), Schouten, A.C. (author), Van der Helm, F.C.T. (author)
In daily life humans integrate force and position feedback from mechanoreceptors, proprioception, and vision. With handling relatively soft, elastic objects, force and position are related and can be integrated to improve the accuracy of an estimate of either one. Sensory weighting between different sensory systems (e.g., vision and...
journal article 2009
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Schuurmans, J. (author), De Vlugt, E. (author), Schouten, A.C. (author), Meskers, C.G. (author), De Groot, J.H. (author), Van der Helm, F.C.T. (author)
Sudden stretch of active muscle typically results in two characteristic electromyographic responses: the short latency M1 and the long latency M2. The M1 response originates from the monosynaptic Ia afferent reflex pathway. The M2 response is less well understood and is likely a compound response to different afferent inputs mediated by spinal...
journal article 2009
Searched for: department:"Biomechanical%5C%2BEngineering"
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