Two cases of blunt chest trauma caused by a baseball are reported, including one death. At least one of these was in consequence of cardiac concussion or commotio cordis, an entity not described in teh pediatric literature. Concussion of the heart is a functional injury, in contrast to cardiac contusion or cardiac rupture, which pertains to structural injury. However, a cardiac concussion appea...

A ball can be hit faster if it is projected without spin but it can be hit farther if it is projected with backspin. Measurements are presented in this paper of the tradeoff between speed and spin for a baseball impacting a baseball bat. The results are inconsistent with a collision model in which the ball rolls off the bat and instead imply tangential compliance in the ball, the bat, or both. ...

A ball can be hit faster if it is projected without spin, but it can be hit farther if it is projected with backspin. Measurements of the tradeoff between the speed and spin for a baseball impacting a baseball bat are presented. The results are inconsistent with a collision model in which the ball rolls off the bat and instead imply tangential compliance in the ball, the bat, or both. If the re...

In his 1981 Baseball Abstract [8], Bill James posed the following problem: suppose two teams A and B have winning percentages a and b, respectively, having played equally strong schedules in a game such as baseball where there are no ties. If A and B play each other, what is the probability p(a, b) that A wins? This question is perhaps more relevant to other sports, because in baseball the outc...

Rotator cuff injuries are among the most common shoulder injuries seen in athletes. They occur mostly in baseball players and other athletes who frequently use the arm in overhead or throwing positions. Although juvenile and adolescent baseball players are also prone to shoulder injuries, tears of the rotator cuff are extremely uncommon in this age group. A review of the orthopaedic and sports ...

A healthy 16-year-old female baseball player was referred by her pediatrician for evaluation of pain in her right, dominant shoulder. The pain had begun insidiously 4 weeks previously after several sessions of batting practice and had worsened until she could not participate in baseball, even with low doses of ibuprofen. She was not participating in any other sports or weight lifting and had ha...

To explicitly detect baseball events, a multimodal approach that combines the decisions of visual and speech event detection is proposed. We respectively perform event detection from visual and speech perspectives and estimate the corresponding confidences. By combining the decisions from different modalities, the detection performance increases by 8% ~ 20%, in terms of F1 metric. This work ach...

Major League Baseball (MLB) generated over $6 billion of revenue in 2007. Despite the sizable revenuegenerating capacity of this sport, the league’s 30 franchises (29 based in the US and 1 in Canada) have until recently relied primarily on the subjective wisdom of baseball insiders to guide personnel decisions and game strategy. Only in the last years has quantitative analysis played a substant...