Caroline A.M. Doorenbosch

article

Reproducibility and validity of video screen measurements of gait in children with spastic cerebral palsy

Sebastian Grunt, Petra J. van Kampen, Marjolein M. van der Krogt, Merel-Anne Brehm, more

Gait & Posture > 2010 > 31 > 4 > 489-494

To determine the reproducibility and validity of video screen measurement (VSM) of sagittal plane joint angles during gait.17 children with spastic cerebral palsy walked on a 10m walkway. Videos were recorded and 3d-instrumented gait analysis was performed. Two investigators measured six sagittal joint/segment angles (shank, ankle, knee, hip, pelvis, and trunk) using a custom-made software package...

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Walking speed modifies spasticity effects in gastrocnemius and soleus in cerebral palsy gait

Marjolein M. van der Krogt, Caroline A.M. Doorenbosch, Jules G. Becher, Jaap Harlaar

Clinical Biomechanics > 2009 > 24 > 5 > 422-428

The calf muscles of children with cerebral palsy are often spastic, which can lead to an equinus gait pattern. Although spasticity is defined as a velocity-dependent increase in muscle tone, very little is known about the effect of walking speed on muscle–tendon behavior of spastic muscles during gait. The aim of this study was to investigate gastrocnemius and soleus length and lengthening velocity...

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The effect of walking speed on hamstrings length and lengthening velocity in children with spastic cerebral palsy

Marjolein M. van der Krogt, Caroline A.M. Doorenbosch, Jaap Harlaar

Gait & Posture > 2009 > 29 > 4 > 640-644

Children with cerebral palsy often walk with reduced knee extension in terminal swing, which can be associated with short length or slow lengthening velocity of hamstrings muscles during gait. This study investigated the role of two factors that may contribute to such short and slow hamstrings: walking speed and spasticity. 17 children with spastic cerebral palsy and 11 matched typically developing...

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Complete 3D kinematics of upper extremity functional tasks

Carolien J. van Andel, Nienke Wolterbeek, Caroline A.M. Doorenbosch, DirkJan (H.E.J.) Veeger, more

Gait & Posture > 2008 > 27 > 1 > 120-127

Upper extremity (UX) movement analysis by means of 3D kinematics has the potential to become an important clinical evaluation method. However, no standardized protocol for clinical application has yet been developed, that includes the whole upper limb. Standardization problems include the lack of a single representative function, the wide range of motion of joints and the complexity of the anatomical...

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Validation of hamstrings musculoskeletal modeling by calculating peak hamstrings length at different hip angles

Marjolein M. van der Krogt, Caroline A.M. Doorenbosch, Jaap Harlaar

Journal of Biomechanics > 2008 > 41 > 5 > 1022-1028

Accurate estimates of hamstrings lengths are useful, for example, to facilitate planning for surgical lengthening of the hamstrings in patients with cerebral palsy. In this study, three models used to estimate hamstrings length (M1: Delp, M2: Klein Horsman, M3: Hawkins and Hull) were evaluated. This was done by determining whether the estimated peak semitendinosus, semimembranosus and biceps femoris...

article

Muscle length and lengthening velocity in voluntary crouch gait

Marjolein M. van der Krogt, Caroline A.M. Doorenbosch, Jaap Harlaar

Gait & Posture > 2007 > 26 > 4 > 532-538

The purpose of this study was to explore how origin-insertion length and lengthening velocity of hamstring and psoas muscle change as a result of crouch gait. The second purpose was to study the effect of changes in walking speed, in crouch, on muscle lengths and velocities. Eight healthy female subjects walked on a treadmill both normally and in crouch. In the crouch condition, subjects walked at...

article

Calibration of EMG to force for knee muscles is applicable with submaximal voluntary contractions

Caroline A.M. Doorenbosch, Annemiek Joosten, Jaap Harlaar

Journal of Electromyography and Kinesiology > 2005 > 15 > 4 > 429-435

Purpose: In this study, the influence of using submaximal isokinetic contractions about the knee compared to maximal voluntary contractions as input to obtain the calibration of an EMG–force model for knee muscles is investigated.Methods: Isokinetic knee flexion and extension contractions were performed by healthy subjects at five different velocities and at three contraction levels (100%, 75% and...

article

Accuracy of a practicable EMG to force model for knee muscles

Caroline A.M. Doorenbosch, Jaap Harlaar

Neuroscience Letters > 2004 > 368 > 1 > 78-81

A practicable EMG-force model is evaluated for muscles about the knee. The model included envelope signal processing and a gain-dependency of knee angle and angular velocity. Six healthy subjects participated in the experiments. For calibration, maximal isokinetic contractions about the knee were performed on a dynamometer with recordings of knee joint movement, net moment and EMG of thigh muscles...

article

A clinically applicable EMG-force model to quantify active stabilization of the knee after a lesion of the anterior cruciate ligament

Caroline A.M. Doorenbosch, Jaap Harlaar

Clinical Biomechanics > 2003 > 18 > 2 > 142-149

Objective. To investigate whether a simple electromyography-force (EMG-force) model can be used to measure different levels of co-contraction about the knee for healthy subjects and patients with an anterior cruciate ligament deficiency.Design. To evaluate an EMG-to-force processing model, two groups of subjects, with and without deficiency of the anterior cruciate ligament, participated in experiments...

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Intermuscular co-ordination during fast contact control leg tasks in man

Caroline A.M. Doorenbosch, Tom G. Welter, Gerrit Jan van Ingen Schenau

Brain Research > 1997 > 751 > 2 > 239-246

From previous inverse dynamic analyses of human leg extensions, it was hypothesized that the underlying processes for the activation of mono- and biarticular muscles are different; the mono-articular muscles being activated when they shortened, whereas the biarticular muscles appeared responsible for the control of the external force direction. In the present study, experiments were performed on a...

article

Stiffness control for lower leg muscles in directing external forces

Caroline A.M. Doorenbosch, Jaap Harlaar, Gerrit Jan van Ingen Schenau

Neuroscience Letters > 1995 > 202 > 1-2 > 61-64

The role of lower leg muscles is investigated during contact control tasks, in which the external force, applied by the foot on the surface, has to be controlled. Force, position and muscle activation were recorded. All subjects showed a stereotyped activation pattern to accomplish the tasks. The torques about hip and knee changed by a reciprocal activation pattern of the upper leg muscles, whereas...

article

The role of mono- and bi-articular muscles during contact control leg tasks in man

Caroline A.M. Doorenbosch, Gerrit Jan van Ingen Schenau

Human Movement Science > 1995 > 14 > 3 > 279-300

From an analysis of cycling, it was hypothesized that mono- and bi-articular muscles may have different roles in the control of contact control tasks. The aim of the present study is to find experimental evidence for this hypothesis. On a special dynamometer, subjects were instructed to exert a force in a prescribed direction while the forceplate was either fixed (isometric) or slowly moving downwards...

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Search results for: Caroline A.M. Doorenbosch

Reproducibility and validity of video screen measurements of gait in children with spastic cerebral palsy

Walking speed modifies spasticity effects in gastrocnemius and soleus in cerebral palsy gait

The effect of walking speed on hamstrings length and lengthening velocity in children with spastic cerebral palsy

Complete 3D kinematics of upper extremity functional tasks

Validation of hamstrings musculoskeletal modeling by calculating peak hamstrings length at different hip angles

Muscle length and lengthening velocity in voluntary crouch gait

Calibration of EMG to force for knee muscles is applicable with submaximal voluntary contractions

Accuracy of a practicable EMG to force model for knee muscles

A clinically applicable EMG-force model to quantify active stabilization of the knee after a lesion of the anterior cruciate ligament

Intermuscular co-ordination during fast contact control leg tasks in man

Stiffness control for lower leg muscles in directing external forces

The role of mono- and bi-articular muscles during contact control leg tasks in man

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