Utilization of DICOM multi-frame objects for integrating kinetic and kinematic data with raw videos in movement analysis of wheel-chair users to minimize shoulder pain

2012 ◽  
Author(s):  
Ruchi R. Deshpande ◽  
Han Li ◽  
Philip Requejo ◽  
Sarah McNitt-Gray ◽  
Puja Ruparel ◽  
...  
Keyword(s):  
Shoulder Pain ◽  
Movement Analysis ◽  
Kinematic Data ◽  
Wheel Chair

scholarly journals Kinematic and Kinetic Indicators of Sit-to-Stand

2016 ◽  
Vol 32 (1) ◽  
pp. 7-15 ◽  
Author(s):  
Catherine A. Stevermer ◽  
Jason C. Gillette
Keyword(s):  
Reaction Force ◽  
Movement Analysis ◽  
Vertical Posture ◽  
Camera System ◽  
Kinematic Data ◽  
Foot Placement ◽  
Sit To Stand ◽  
Statistical Similarity ◽  
Single Force ◽  
Platform System

Variation in the timing indicators separating sit-to-stand (STS) into movement phases complicates both research comparisons and clinical applications. The purpose of this study was to use kinetic reference standards to identify accurate kinematic and kinetic indicators for STS movement analysis such that consistent indicators might be used for STS from varied initial postures. Healthy adults performed STS using 4 foot placements: foot-neutral, foot-back, right-staggered, and left-staggered. Kinetic and kinematic data were collected from force platforms and an 8-camera video system. Initiation, seat-off, vertical posture, and termination were detected with 5% start and 7.5% end thresholds for changes in kinetic and kinematic STS indicators. Timing differences between kinetic and kinematic indicator time points and the reference vertical seated reaction force end point (seatoff) were determined. Kinematic indicators were compared with selected kinetic indicators using timing differences, statistical similarity, and internal consistency measures. Our results suggest that a single force platform system measuring vertical GRF or a simple camera system to evaluate the shoulder marker position and velocity can accurately and consistently detect STS initiation, seat-off, and vertical posture. In addition, these suggested STS indicators for initiation, seat-off, and vertical posture were not dependent upon foot placement.

scholarly journals Comparación de la normalización lineal de la escala de tiempos con el registro funcional continuo en movimientos cíclicos del cuello

2019 ◽  
Author(s):  
Alvaro Page ◽  
Noelia López ◽  
William Ricardo Venegas ◽  
Pilar Serra
Keyword(s):  
Simple Model ◽  
Functional Data ◽  
Linear Time ◽  
Movement Analysis ◽  
Temporal Patterns ◽  
Human Movement ◽  
Kinematic Data ◽  
Human Movement Analysis ◽  
Sit To Stand

La normalización de la escala de tiempos es un paso necesario para aplicar las técnicas de análisis de datos funcionales al estudio de los movimientos humanos. La técnica estándar es la normalización lineal que, a pesar de su sencillez, puede ser ineficaz para reducir la variabilidad en la duración de los eventos [1]. Una alternativa es el registro continuo que supone ajustar de forma no lineal la escala de tiempos [2]. En este caso, la información temporal se mantiene en las funciones warping, que relacionan el tiempo modificado frente al promedio. No obstante, este procedimiento es complejo y computacionalmente costoso. Además, se ha señalado que en movimientos cíclicos como el de masticación apenas hay diferencias entre métodos [3]. En este trabajo se comparan ambos métodos en el caso del movimiento cíclico de flexo-extensión del cuello, analizando las funciones ángulo y velocidad angular. A partir de una base de datos con 437 ciclos completos extensión-flexión de cuello, se han aplicado ambos tipos de normalización de la escala temporal. Se han analizado las diferencias en las curvas medias y las desviaciones típicas funcionales, cuyos valores medios e intervalos de confianza se han establecido mediante un proceso de bootstrapping. Los resultados muestran que apenas hay diferencias en las curvas medias obtenidas por ambos procedimientos, aunque sí en las desviaciones típicas funcionales, que son algo menores en el caso del registro no lineal. Por otra parte, los resultados obtenidos con el registro no lineal son diferentes cuando se usan las curvas de posición o las de velocidad como referencia para el reescalado. Estos resultados sugieren que el registro no lineal, aunque puede ser útil para el análisis de señales no periódicas o donde no haya que analizar a la vez funciones y sus derivadas, no ofrece ventajas importantes frente a la normalización lineal en el caso de los movimientos cíclicos. REFERENCIAS [1]  Page, A., & Epifanio, I. (2007). A simple model to analyze the effectiveness of linear time normalization to reduce variability in human movement analysis. Gait & posture, 25(1), 153-156. [2]  Page, A., et al. (2006). Normalizing temporal patterns to analyze sit-to-stand movements by using registration of functional data. Journal of biomechanics, 39(13), 2526-2534. [3]  Crane, E. et al.. (2010). Effect of registration on cyclical kinematic data. Journal of biomechanics, 43(12), 2444-2447.

Role of pinnae and head movements in localizing pure tones 1The authors would like to thank Mr. Remi Humbert for implementing the experiment in Turbo Pascal and for his further assistance.

1999 ◽  
Vol 58 (3) ◽  
pp. 170-179 ◽  
Author(s):  
Barbara S. Muller ◽  
Pierre Bovet
Keyword(s):  
Sound Source ◽  
Head Movement ◽  
Movement Analysis ◽  
Head Movements ◽  
Sound Sources ◽  
Localization Accuracy ◽  
Sound Effects ◽  
Posterior Quadrant ◽  
Localization Performance ◽  
Pure Tones

Twelve blindfolded subjects localized two different pure tones, randomly played by eight sound sources in the horizontal plane. Either subjects could get information supplied by their pinnae (external ear) and their head movements or not. We found that pinnae, as well as head movements, had a marked influence on auditory localization performance with this type of sound. Effects of pinnae and head movements seemed to be additive; the absence of one or the other factor provoked the same loss of localization accuracy and even much the same error pattern. Head movement analysis showed that subjects turn their face towards the emitting sound source, except for sources exactly in the front or exactly in the rear, which are identified by turning the head to both sides. The head movement amplitude increased smoothly as the sound source moved from the anterior to the posterior quadrant.

Die Bewegung für Klimagerechtigkeit und Energiedemokratie in Deutschland.

2016 ◽  
Vol 46 (184) ◽  
pp. 403-421 ◽  
Author(s):  
Henrik Sander
Keyword(s):  
Social Movements ◽  
Social Movement ◽  
Movement Analysis ◽  
Climate Justice ◽  
Climate Politics ◽  
Historical Materialist

This article argues that social movement research must be renewed by a historical-materialist perspective to be able to understand the emergence and effects of the relatively new climate justice movement in Germany. The previous research on NGOs and social movements in climate politics is presented and the recent development of the climate justice movement in Germany is illustrated. In a final step two cases of climate movement campaigns are explained by means of the historical-materialist movement analysis proposed by the author.

Automatic Wheel Chair Control Using Eyeball Movement for Physically Challenged People

2012 ◽  
Vol 3 (3) ◽  
pp. 317-319
Author(s):  
R.Venkatesh R.Venkatesh ◽  
◽  
R.Karthick R.Karthick
Keyword(s):  
Wheel Chair ◽  
Physically Challenged
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