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van de Ruit, M.L. (author), Lataire, John (author), van der Helm, F.C.T. (author), Mugge, W. (author), Schouten, A.C. (author)During movement, our central nervous system (CNS) takes into account the dynamics of our environment to optimally adapt our joint dynamics. In this study we explored the adaptation of shoulder joint dynamics when a participant interacted with a time-varying virtual environment created by a haptic manipulator. Participants performed a position...conference paper 2018
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Gursel Ozmen, Nurhan (author), van der Helm, F.C.T. (author), Schouten, A.C. (author)The modeling of the dynamic behavior of the human arm is an important issue in robotics, biomedical and medical fields. In this study, it was aimed to construct an inverse dynamics model for the sequential motion of the arm subjected to external force fluctuations using a two degree of freedom manipulator. In experiments with healthy...conference paper 2018
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van Oosterhout, J. (author), Heemskerk, Cock (author), Boessenkool, H. (author), De Baar, Marco R. (author), van der Helm, F.C.T. (author), Abbink, D.A. (author)Tele-manipulation of heavy loads typically requires the simultaneous use of two asymmetric slaves: a crane for vertical weight support; and a robot for accurate lateral positioning. The industrial standard prescribes a pair of operators for such tasks (one operator to control each slave), although in principle one operator might control both...journal article 2018
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Filatova, O.G. (author), Yang, Y. (author), Dewald, J.P.A. (author), Tian, Runfeng (author), Maceira-Elvira, Pablo (author), Takeda, Yusuke (author), Kwakkel, Gert (author), Yamashita, Okito (author), van der Helm, F.C.T. (author)In hemiparetic stroke, functional recovery of paretic limb may occur with the reorganization of neural networks in the brain. Neuroimaging techniques, such as magnetic resonance imaging (MRI), have a high spatial resolution which can be used to reveal anatomical changes in the brain following a stroke. However, low temporal resolution of MRI...journal article 2018
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van der Kruk, E. (author), van der Helm, F.C.T. (author), Veeger, H.E.J. (author), Schwab, A.L. (author)The quantification of mechanical power can provide valuable insight into athlete performance because it is the mechanical principle of the rate at which the athlete does work or transfers energy to complete a movement task. Estimates of power are usually limited by the capabilities of measurement systems, resulting in the use of simplified power...review 2018
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Tian, Runfeng (author), Yang, Y. (author), van der Helm, F.C.T. (author), Dewald, J.P.A. (author)The human nervous system is an ensemble of connected neuronal networks. Modeling and system identification of the human nervous system helps us understand how the brain processes sensory input and controls responses at the systems level. This study aims to propose an advanced approach based on a hierarchical neural network and non-linear...journal article 2018
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van de Ruit, M.L. (author), Cavallo, Gaia (author), Lataire, John (author), van der Helm, F.C.T. (author), Mugge, W. (author), van Wingerden, J.W. (author), Schouten, A.C. (author)During movements, humans continuously regulate their joint impedance to minimize control effort and optimize performance. Joint impedance describes the relationship between a joint's position and torque acting around the joint. Joint impedance varies with joint angle and muscle activation and differs from trial-to-trial due to inherent...journal article 2018
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Gasparutto, X. (author), van der Graaff, E. (author), van der Helm, F.C.T. (author), Veeger, H.E.J. (author)In baseball pitching, biomechanical parameters have been linked to ball velocity and potential injury risk. However, although the features of a biomechanical model have a significant influence on the kinematics and kinetics of a motion, this influence have not been assessed for pitching. The aim of this study was to evaluate the choice of the...journal article 2018
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Kalogianni, K. (author), Daffertshofer, Andreas (author), van der Helm, F.C.T. (author), Schouten, A.C. (author), de Munck, Jan C. (author)In searching for clinical biomarkers of the somatosensory function, we studied reproducibility of somatosensory potentials (SEP) evoked by finger stimulation in healthy subjects. SEPs induced by electrical stimulation and especially after median nerve stimulation is a method widely used in the literature. It is unclear, however, if the EEG...journal article 2018
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Mugge, W. (author), van Hilten, Jacobus J. (author), van der Helm, F.C.T. (author), Schouten, A.C. (author)This paper focuses on the pathophysiology of fixed dystonia (i.e., sustained muscle contractions resulting in abnormal postures) in Complex Regional Pain Syndrome from an engineering point of view. Although the mechanisms are still elusive, the evidence implicating involvement of aberrant muscle force feedback is compelling. A neuromuscular...conference paper 2018
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Vlaar, M.P. (author), Solis Escalante, T. (author), Vardy, A.N. (author), van der Helm, F.C.T. (author), Schouten, A.C. (author)Cortical responses to continuous stimuli as recorded using either magneto- or electroencephalography (EEG) have shown power at harmonics of the stimulated<br/>frequency, indicating nonlinear behavior. Even though the selection of analysis techniques depends on the linearity of the system under study, the importance of nonlinear contributions to...journal article 2017
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Happee, R. (author), de Bruijn, E. (author), Forbes, P.A. (author), van der Helm, F.C.T. (author)The human head-neck system requires continuous stabilization in the presence of gravity and trunk motion. We investigated contributions of the vestibulocollic reflex (VCR), the cervicocollic reflex (CCR), and neck muscle co-contraction to head-in-space and head-on-trunk stabilization, and investigated modulation of the stabilization strategy...journal article 2017
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de Bruijn, E. (author), Nijmeijer, SWR (author), Forbes, P.A. (author), Koelman, JHTM (author), van der Helm, F.C.T. (author), Tijssen, MAJ (author), Happee, R. (author)Objective<br/>To identify effects of a deviant motor drive in the autospectral power of dystonic muscles during voluntary contraction in cervical dystonia patients.<br/>Methods<br/>Submaximal (20%) isometric head-neck tasks were performed with the head fixed, measuring surface EMG of the sternocleidomastoid, splenius capitis and semispinalis...journal article 2017
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Vlaar, M.P. (author), Solis Escalante, T. (author), Dewald, J.P.A. (author), Van Wegen, Erwin E H (author), Schouten, A.C. (author), Kwakkel, G. (author), van der Helm, F.C.T. (author)Background: Cortical damage after stroke can drastically impair sensory and motor function of the upper limb, affecting the execution of activities of daily living and quality of life. Motor impairment after stroke has been thoroughly studied, however sensory impairment and its relation to movement control has received less attention. Integrity...journal article 2017
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van der Kruk, E. (author), Veeger, H.E.J. (author), van der Helm, F.C.T. (author), Schwab, A.L. (author)Advice about the optimal coordination pattern for an individual speed skater, could be addressed by simulation and optimization of a biomechanical speed skating model. But before getting to this optimization approach one needs a model that can reasonably match observed behaviour. Therefore, the objective of this study is to present a verified...journal article 2017
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Yang, Y. (author), Dewald, J.P.A. (author), van der Helm, F.C.T. (author), Schouten, A.C. (author)Neural coupling between the central nervous system and the periphery is essential for the neural control of movement. Corticomuscular coherence is a popular linear technique to assess synchronised oscillatory activity in the sensorimotor system. This oscillatory coupling originates from ascending somatosensory feedback and descending motor...journal article 2017
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Forbes, P.A. (author), de Bruijn, E. (author), Nijmeijer, SWR (author), Koelman, JHTM (author), van der Helm, F.C.T. (author), Schouten, A.C. (author), Tijssen, MAJ (author), Happee, R. (author)Background Effective sensorimotor integration is essential to modulate (adapt) neck stabilization strategies in response to varying tasks and disturbances. This study evaluates the hypothesis that relative to healthy controls cervical dystonia patients have an impaired ability to modulate afferent feedback for neck stabilization with changes...journal article 2017
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Venrooij, J. (author), Mulder, Max (author), Mulder, M. (author), Abbink, D.A. (author), van Paassen, M.M. (author), van der Helm, F.C.T. (author), Bulthoff, Heinrich H. (author)Biodynamic feedthrough (BDFT) refers to the feedthrough of vehicle accelerations through the human body, leading to involuntary control device inputs. BDFT impairs control performance in a large range of vehicles under various circumstances. Research shows that BDFT strongly depends on adaptations in the neuromuscular admittance dynamics of the...journal article 2017
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Wu, Y. (author), Nieuwenhoff, M.D. (author), Huygen, F.J.P.M. (author), van der Helm, F.C.T. (author), Niehof, S.P. (author), Schouten, A.C. (author)Small nerve fibers regulate local skin blood flow in response to local thermal perturbations. Small nerve fiber function is difficult to assess with classical neurophysiological tests. In this study, a vasomotor response model in combination with a heating protocol was developed to quantitatively characterize the control mechanism of small...journal article 2017
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Ross, P.S. (author), van der Helm, A.W.C. (author), Van Den Broeke, J. (author), Rietveld, L.C. (author)The application of ozone in water treatment serves many purposes, such as disinfection and degradation of organic micro-pollutants. To optimise the applied ozone dosage by on-line control, real-time information on the actual Ct value, the bromate and assimilable organic carbon concentration (AOC) is necessary. With UV/Vis spectroscopy,...journal article 2016