Abstmet-4 is shown that human subjects are incapable of producing with the arm, in free space, planned or extemporaneously drawn trajectories in which the plane of wrist motion changes smoothly or continuously. The three-dimensional nature of these movements results from the fact that the plane of motion changes abruptly from one segment of the trajectory to the next, being conii~& to one plane...

The load-displacement behavior of 35 fresh adult cervical spine motion segments was measured in compression, shear, flexion, extension, lateral bending and axial torsion tests. Motion segments were tested both intact and with posterior elements removed. Applied forces ranged to 73.6 N in compression and to 39 N in shear, while applied moments ranged to 2.16 Nm. For each mode of loading, princip...

When the central region of an obliquely oriented line is bisected by a wide, vertical opaque occluder, observers misperceive the two line segments as being misaligned (the Poggendorff illusion). If the oblique line segment is replaced with a spot moving on an oblique trajectory, little if any misalignment is perceived. This accurate alignment of oblique segments depends upon the consistent moti...

Several studies have demonstrated that the natural course of hypertrophic cardiomyopathy can be variable, often unpredictable with high morbidity and mortality. Therefore, screening for potential cases and periodical evaluation of affected patients is compelling. The purpose of our study is to assess a relationship of the electrocardiographic finding of ST-segment elevation and/or abnormal Q wa...

The purpose of this investigation was to design and verify the capabilities of an in vitro loading-measurement system that mimics in vivo unconstrained three dimensional (3D) relative motion between long bone ends, applies uniform load components over the entire length of a test specimen, and measures 3D relative motion between test segment ends to directly determine test segment construct stif...

Background. Effective kick-topspin serving in tennis requires power to transfer mechanical energy through a kinematic chain from different parts of the body that is directly related to the kinetics of the joints. Energy flow analysis is a powerful tool for observing the mechanical energy transfer through the body parts. Objectives. This research aimed to study the correlation and predictive ab...

Methods Twelve children performed five walking trials at a self selected velocity while barefoot and wearing school shoes (Daytona, Clarks). A 10 camera 200Hz 3D motion analysis system (EVaRT5.0, MAC) was used to calculate marker trajectories. Force plate data were collected at 1000Hz (KistlerTM). Retro-reflective markers were attached to the right leg and to the foot/shoe at the navicular, 1 a...

Sports involving throwing, striking and kicking activities, such as tennis, squash, baseball, football, among others, demand the production of maximum speed at the end of the distal segment in a kinematic chain. Research done on the biomechanics of these various, yet somehow similar sporting techniques, suggests that athletes generate large hand and foot speeds as a result of a proximal-to-dist...

The effect of early chronic Chagas's disease on the timing and extent of regional left ventricular wall motion was studied with a frame by frame analysis of left ventriculograms in nine patients and compared with those in 19 normal subjects. In all the patients there was hypokinesis or akinesis in the anteroapical region together with delay in the onset of inward movement. Hypokinesis of the pr...

We present wavelet based video compression algorithms. The motion estimation and compensation, which is an essential part in the compression, is based on segment movements. The proposed based codec sequentially employs the following steps: We first divide each frame in the sequence into blocks resulted from the block matching algorithm. The, we appply Hough transform, in order to group it into ...