Bingham, Schmidt and Rosenblum (1989) found that people could, by hefting objects of different sizes, choose that of optimal weight in each size for throwing to a maximum distance. Larger weights were chosen in larger sizes as required for equivalent perceived heaviness according to the size-weight illusion. In Experiment 1, we replicated that result testing a larger range of objects and more p...

Overhand throwing motion is often regarded as one of the basic motions along with walking, running, and jumping. Three-dimensional (3-D) image analysis of the kinematics and kinetics using of rigid body segment model of overhand throwing motion has been studied widely in recent years. In this paper biomechanical research on throwing is reviewed with a special focus of studies from Japan. Consid...

The purpose of this study is to use computer simulation to establish the optimal release conditions for javelin world record holders. The researcher adopted the data on the relationship between the attack angle and the distance from COM (the javelin’s center of mass) to COP (the javelin's center of pressure), and used javelins which complied with the new rules [1]. Then numerical methods were u...

HYPOTHESIS In this study, we aim to test whether scapular winging results in a significant change in glenohumeral translation in the initial phase of the throwing motion. METHODS Six shoulders underwent an abbreviated throwing motion (ATM) from late cocking to the end of acceleration by use of a validated robotic system. The intact specimens were tested to establish a baseline. The position o...

The purpose of this study was to identify the role of humeral elevation of the non-throwing arm in relation to maximum ball velocity (MBV) in unconstrained overarm throws in children aged 12-14. 3D motion analysis was used to investigate the throwing technique of 144 students. The group was classified as ‘skilled’ or ‘less skilled’ based on MBV at release. Joints kinematics and timing of segmen...

INTRODUCTION: As compared to the axis of the elbow joint, the humeral head is directed inward and backward. This is called retroversion of the humeral head or retrotorsion of the humerus respectively (13). Orthopaedic interest in humeral torsion goes back to the 70's. In 1971 DEBEVOISE et al. were the first to suggest a relationship between humeral torsion and shoulder instability (3). Our own ...

BACKGROUND Shoulders of throwing and swimming athletes are highly stressed joints that often show structural abnormalities on magnetic resonance imaging (MRI). However, while water polo players exhibit a combination of throwing and swimming movements, a specific pattern of pathological findings has not been described. PURPOSE To assess specific MRI abnormalities in shoulders of elite water po...

Repetitive throwing or other overhead activity places great stress on the shoulder. As a result, the shoulder is a common site of injury in athletes. Addressing throwing-related injuries requires an understanding of throwing biomechanics and pathology. Nonoperative treatment is directed at restoring strength, flexibility, and neuromuscular control to the entire kinetic chain. Surgery is indicat...

The uneven sowing of wheat on ground covered with rice straw in the rice–wheat rotation area middle and lower reaches Yangtze River has become a serious problem. Therefore, test bed for throwing soil after wide seed belt was designed, which could complete functions crushing, lateral concentration uniform at one time. discrete element simulation model established rotary blade shaft speed, guide ...