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Citations since 2017
Publications
Publications (23)
Descend technique and performance vary among elite racing cyclists and it is not clear what slower riders should do to improve their performance. An observation study was performed of the descending technique of members of a World Tour cycling team and the technique of each member was compared with the fastest descender amongst them. The obtained d...
Purpose:
The purpose of this study was to provide insight in the effect of wheelchair settings on wheelchair mobility performance.
Methods:
Twenty elite wheelchair basketball athletes of low (n=10) and high classification (n=10), were tested in a wheelchair basketball directed field test. Athletes performed the test in their own wheelchair, whic...
Purpose:
Classification is a defining factor for competition in wheelchair sports, but it is a delicate and time-consuming process with often questionable validity.(1) New inertial sensor based measurement methods applied in match play and field tests, allow for more precise and objective estimates of the impairment effect on wheelchair mobility p...
http://dx.doi.org/10.1016/j.jbiomech.2016.08.022
Free available until december 6th 2016 via: http://authors.elsevier.com/a/1TuqD4-6-EZQ5
Abstract
Quantitative assessment of an athlete's individual wheelchair mobility performance is one prerequisite needed to evaluate game performance, improve wheelchair settings and optimize training routines. Ine...
Short sprints are important components of most wheelchair court sports, since being faster than the opponent often determines keeping ball possession or not. Sprinting capacity is best measured during a field test, allowing the athlete to freely choose push strategies adapted to their own wheelchair setting, physical ability, classification and spe...
Application of a 3-IMU configuration for measuring wheelchair kinematics in sports.Poster APCST 2015 Barcelona
Accurate knowledge of wheelchair kinematics during a match could be a significant factor in performance improvement in wheelchair basketball. To date, most systems for measuring wheelchair kinematics are not suitable for match applications or lack detail in key kinematic outcomes. This study describes the construction of wheel skid correction algor...
Knowledge of wheelchair kinematics during a match is prerequisite for performance improvement in wheelchair basketball. Unfortunately, no measurement system providing key kinematic outcomes proved to be reliable in competition. In this study, the reliability of estimated wheelchair kinematics based on a three inertial measurement unit (IMU) configu...
The reliability of inertial measurement unit (IMU) outcomes for measuring wheelchair kinematics was assessed. Twenty participants performed a course reflecting all different kinematic aspects of wheelchair basketball. During the test wheelchair kinematics were measured using a 24 camera 3D motion analysis system (Optitrack) as gold standard and thr...
In patients with central neurological disorders, gait is often limited by a reduced ability to push off with the ankle. To overcome this reduced ankle push-off, energy-storing, spring-like carbon-composite Ankle Foot Orthoses (AFO) can be prescribed. It is expected that the energy returned by the AFO in late stance will support ankle push-off, and...
Measures calculated from unperturbed walking patterns, such as variability measures and maximum Floquet multipliers, are often used to study the stability of walking. However, it is unknown if, and to what extent, these measures correlate to the probability of falling. We studied whether in a simple model of human walking, i.e., a passive dynamic w...
To examine the stability of human walking, methods such as local dynamic stability have been adopted from dynamical systems theory. Local dynamic stability is calculated by estimating maximal finite time Lyapunov exponents (λ(S) and λ(L)), which quantify how a system responds continuously to very small (i.e. "local") perturbations. However, it is u...
In stroke and multiple sclerosis patients, gait is frequently hampered by a reduced ability to push-off with the ankle caused by weakness of the plantar-flexor muscles. To enhance ankle push-off and to decrease the high energy cost of walking, spring-like carbon-composite Ankle Foot Orthoses are frequently prescribed. However, it is unknown what An...
The aim of this study was to assess the functional effects and mechanical contribution of Ankle Foot Orthoses (AFO) prescribed to overcome drop-foot gait. We hypothesized that poor functional effects of the AFO relate to insufficient mechanical contribution of the AFO during the swing phase, or unwanted constraining of the ankle during the stance p...
Ankle Foot Orthoses (AFOs) to promote walking ability are a common treatment in patients with neurological or muscular diseases. However, guidelines on the prescription of AFOs are currently based on a low level of evidence regarding their efficacy. Recent studies aiming to demonstrate the efficacy of wearing an AFO in respect to walking ability ar...
Children with cerebral palsy frequently experience foot dragging and tripping during walking due to a lack of adequate knee flexion in swing (stiff-knee gait). Stiff-knee gait is often accompanied by an overly flexed knee during stance (crouch gait). Studies on stiff-knee gait have mostly focused on excessive knee muscle activity during (pre)swing,...
The mechanical characteristics of ankle foot orthoses (AFOs), such as the stiffness and neutral angle around the ankle and metatarsal-phalangeal (MTP) joints, are rarely quantified. Paradoxically, it is expected that these characteristics determine the function of the AFO in pathological gait. Therefore a device to determine these AFO characteristi...
Efficiency in manual wheelchair propulsion is low, as is the fraction of the propulsion force that is attributed to the moment of propulsion of the wheelchair. In this study we tested the hypothesis that a tangential propulsion force direction leads to an increase in physiological cost, due to (1) the sub-optimal use of elbow flexors and extensors,...
Projects
Projects (2)
The Citius Altius Sanius project aims to promote participation in sport, prevent injuries and improve performance in both amateur and top-level sport. This can be achieved by providing the athlete with information via sensors, data science technology and psychology-inspired smart feedback devices in order to influence their behaviour.
The 6.2 million euro research project is being conducted by an alliance of eight universities and university medical centers and three universities of applied sciences who will collaborate on the project with NOC*NSF (Dutch Olympic Committee/Dutch Sports Federation), more than 20 businesses several sports associations, including those representing football (KNVB), hockey (KNHB), Baseball (KNBSB) and tennis (KNLTB), sports teams (including Team Sunweb), sports physicians and sports physiotherapy practices.
The goal of this project is to provide athlete, coach and wheelchair experts with information to allow them to set their wheelchair for optimal performance. Wheelchair kinematics in basketball matches where gathered to determine key kinematics to describe wheelchair mobility performance. Currently the relationship between match and field test wheelchair mobility performance is described and measurements are performed regarding the effect of wheelchair settings on performance.
