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Oborin, N. (author)Muscle spindle is an organ of proprioception that plays an important role in neuro-muscular control of the human joints. It is composed of intrafusal fibers, the mechanical properties of which determine the afferent response of the spindle. Intrafusal fibers are not homogenous: they are composed of many sarcomeres, have localized fusimotor...master thesis 2016
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Brandjes, P.E.M. (author)This graduation project aims to develop an orthosis for patients suffering from a reduced Range of Motion (RoM) of the ankle joint. The reduced RoM is in dorsiflexion direction, the patient lacks the ability to turn the foot in the direction of the knee. This gait pattern is known as drop foot gait. This results in a low walking speed, increased...master thesis 2016
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Koenen, B.W. (author)In the field of neurorehabilitation, robots are being used to provide assisting forces for therapeutic purposes, and with system identification & parameter estimation (SIPE) methods they are used to quantify neuromechanical parameters for diagnostic purposes. To better understand the beneficial effect of robotic assistance on the neuromechanical...master thesis 2015
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De Jong, I.M. (author)For this research a new protocol was developed which acquires rich enough data in terms of position, velocity and accelerations such that all the pasive and active parameters of the agonist and antagonist muscle of the wrist in the newest and for this study expended and adapted neuromuscular model can be accurately estimated. Concluded was that...master thesis 2015
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Dobbe, L.R.M. (author)The aim of this study was to determine if and how specific characteristics of visual information influence the motor control strategy adopted during a visuomotor tracking task. To this end, twenty healthy subjects and two stroke patients were measured. Changes in wrist joint admittance (i.e., wrist rotations due to external forces) due to...master thesis 2014
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Wijntjes, J.D. (author)Bilateral coupling, the synchronized behavior between the upper limbs in time and direction, is a well known movement phenomenon for babies. After the age of 11 months, this coupling is largely inhibited so that each limb can be coordinated individually. For stroke patients however, bilateral coupling tends to return. The goal of this study is...master thesis 2014
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Ragnarsdottir, K.L. (author)To allow for efficient and robust gait pattern, humans instantaneously modulate their joint impedance. Lower-limb amputees and patients suffering from neurological diseases partly lack that ability. Therefore, prosthetic and rehabilitative devices have been designed to re- store and repair nominal locomotion. For bio-inspired control of these...master thesis 2014
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Farotto, D. (author)Quantification of neuromechanical parameters describing joint admittance is used to improve understanding about human motor control, which is relevant for diagnostics and treatment monitoring of patients suffering from movement disorders. Previous studies used a simple mass-spring-damper (MBK) mechanical model to describe the ankle admittance...master thesis 2014
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Kristinsdottir, H. (author)Quantifying increased resistance of the ankle joint to motion, referred to as ankle impedance, is important for determining the appropriate treatment for rehabilitation of upper motor neuron (UMN) diseases. The increased ankle impedance can be attributed to increased viscoelasticity of the tissues surrounding the joint clinically treated with...master thesis 2013
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Van der Burg, A.A. (author)Human movement control is frequently studied by in vivo quantification of NeuroMuscular System (NMS) properties, e.g. intrinsic joint stiffness and joint damping and reflexive feedback gains, during functional tasks. An important measure in movement control is joint admittance, the relation between joint angle and torque. The NMS properties can...master thesis 2013
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Helgadottir, A. (author)Offset muscle activation is the constant neural firing to muscles, even at rest, defining the minimum muscle contraction. Until now, the offset muscle activation has been neglected in the analysis of the dynamical behavior of joints. There is a clinical need for an assessment method to estimate the contribution of the offset muscle activation to...master thesis 2013
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Verbakel, F. (author)This study proposes an ankle-foot orthosis (AFO) based on a novel concept to compensate increased ankle joint stiffness by adding negative stiffness to the joint. The negative stiffness working principle is a mechanism consisting of a spring generating force around a rotation axis, with a variable moment arm. The spring force is decreasing, when...master thesis 2013
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Derks, L. (author)Introduction: Paresis in UMND patients leads to immobilization and disuse of the ankle joint. As a result, secondary changes such as increased passive stiffness and plastic CNS rearrangements aggravate the paresis. We propose an intervention that compensates the passive stiffness, enabling the remaining muscle force to initialize movement to...master thesis 2013
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Angeluova, G.V. (author)Introduction: Obstetric Brachial Plexus Lesion (OBPL) is characterized by diminished motor and sensory function. These may be worsened by misrouted nerve fibres and faulty formation of central motor programmes. The latter is treated with triceps injections of botulinum toxins, which is aimed at inactivating misrouted nerve fibres in the triceps,...master thesis 2012
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Amirtha, T.R. (author)Existing re-calibration methods for instrumented treadmills have mainly been performed when the instrumented treadmill has been in static operation i.e. the belts are not running. The effect re-calibrating during experimental operation, i.e. while the belts are running, on the ground reaction force (GRF) and the center of pressure (CoP) accuracy...master thesis 2012
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Jain, N. (author)This study sought to find evidence of bimanual coordination in human wrist joint movements, by exploring a phenomenon known as motor irradiation. Subjects were made to perform a force task with their right hand, while the left hand was kept dormant. Torque and position data was collected from both hands, and used to find interlimb coupling...master thesis 2012
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Van Vliet, B. (author)This study quantifies and explores the nonlinearities of human arm responses to large force perturbations while subjects (n=10) performed either a position or relax task. Continuous perturbations with large variations of amplitude levels (RMS values of 2.5, 7.5, 22.5 mm displacements) and pulse perturbations with large amplitudes (average of 16...master thesis 2012
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Van der Greft, I.D. (author)A bi-phasic force response is found in muscle stretch. Force response is high at the start of the stretch and drops at certain length. The high initial force response is referred to as Short Range Stiffness and the moment at which the force response drops is referred to as the elastic limit. It is likely that this bi-phasic torque response is...master thesis 2011
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Onneweer, B. (author)The goal of this study is to quantify the recovery of spinal reflexes at the elbow after neurosurgical intervention in patients with brachial plexus injuries. So far, main focus was on the recovery of muscle force and little on sensory- and reflex system. As reflexes play an important role during normal movement, it is of interest to determine...master thesis 2010
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Rademakers, C. (author)Assessment of the sodium/potassium (Na/K) pump functioning can play an important role in the early diagnosis of several polyneuropathies. However, currently no method exists that allows in vivo testing of the Na/K pump. Therefore, this study developed a test based on repetitive nerve stimulation at single motor units. In order to evaluate the Na...bachelor thesis 2010