Elbow varus torque is a primary factor in the risk of elbow injury during pitching. To examine the effects of shoulder abduction and lateral trunk tilt angles on elbow varus torque, we conducted simulation and regression analyses on 33 college baseball pitchers. Motion data were used for computer simulations in which two angles— shoulder abduction and lateral trunk tilt—were systematically altered. Forty-two simulated motions were generated for each pitcher, and the peak elbow varus torque for each simulated motion was calculated. A two-way analysis of variance was performed to analyze the effects of shoulder abduction and trunk tilt on elbow varus torque. Regression analyses of a simple regression model, second-order regression model, and multiple regression model were also performed. Although regression analyses did not show any significant relationship, computer simulation indicated that the peak elbow varus torque was affected by both angles, and the interaction of those angles was also significant. As trunk tilt to the contralateral side increased, the shoulder abduction angle producing the minimum peak elbow varus torque decreased. It is suggested that shoulder abduction and lateral trunk tilt may be only two of several determinants of peak elbow varus torque.
Tomoyuki Matsuo, Glenn S. Fleisig, Naiquan Zheng and James R. Andrews
Edited by Thomas W. Rowland
This research explored people’s expression of parasocial interaction (PSI) on Boston Red Sox pitcher Curt Schilling’s blog, 38pitches.com. A thematic analysis using grounded theory (Glaser & Strauss, 1967) and constant comparative methodology of 1,337 postings on Schilling’s blog was conducted. Three parasocial aspects emerged from data analysis: identification, admonishment and advice giving, and criticism. The findings of the study provide support for previous research that suggests identification is a PSI component, and given the large presence of admonishment and criticism, the findings extend PSI theory by suggesting that PSI theory must account for and encompass negative relational behaviors. The results also indicate that people’s use of information and communication technologies is reconfiguring parasocial relationships as fans take an active role in soliciting and communicating with professional athletes, subsequently creating more opportunities for PSI to occur.
Sherry L. Werner and Jasper L. Richardson
Column-editor : Carl G. Mattacola
Mathieu Lacome, Ben M. Simpson, Yannick Cholley and Martin Buchheit
limited during SSGs and may not draw an accurate picture of the actual locomotor demands imposed on floaters. Indeed, in the particular case of SSGs where the pitch is reduced, players are not able to reach large distances at high speed (HS), and thus, most of the actions are rather characterized by a