The aim of this study was to compare the coincidence-anticipation timing accuracy of athletes of different racket sports with various stimulus velocity requirements. Ninety players (15 girls, 15 boys for each sport) from tennis (M age = 12.4 yr., SD = 1.4), badminton (M age = 12.5 yr., SD = 1.4), and table tennis (M age = 12.4 yr., SD = 1.2) participated in this study. Three different stimulus velocities, low, moderate, and high, were used to simulate the velocity requirements of these racket sports. Tennis players had higher accuracy when they performed under the low stimulus velocity compared to badminton and table tennis players. Badminton players performed better under the moderate speed comparing to tennis and table tennis players. Table tennis players had better performance than tennis and badminton players under the high stimulus velocity. Therefore, visual and motor systems of players from different racket sports may adapt to a stimulus velocity in coincidence-anticipation timing, which is specific to each type of racket sports.

Purpose: Instructional tasks are a form of content knowledge that can be defined as specialized content knowledge (SCK). We examined the changes in the use of instructional tasks and SCK index scores of preservice teachers from methods to final practicum. Method: Five preservice teachers were observed through the methods practicum where they taught a small group consisting of six to eight students and then through final practicum where they taught whole intact classes. A modified version of content development categories and formula to measure the depth of content development was used. SCK index scores of the preservice teachers created by the formula were used to compare the changes from methods with final practicum. Results: The results showed an increase in the mean SCK index scores of the preservice teachers from methods practicum to final practicum. The use of informing and extending-applying tasks decreased in the final practicum, while an increase occurred in the use of refining and applying tasks. Discussion/Conclusion: Increase in the mean SCK index scores seemed to reflect the strong SCK emphasis of the physical education teacher education program. It can be concluded that SCK can and should be taught to preservice teachers.

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Common content knowledge (CCK) is comprised of the knowledge of rules, techniques, and tactics and can be used to define the scope of what teachers teach in their lessons. Developing reliable and valid measures of teacher knowledge such as CCK strengthens our understanding of what teachers know and in turn the field’s ability to help teachers in their practice. There are, however, few validated tests of CCK of sport for teachers. The primary purpose of this study was to provide content and concurrent validity evidence for a 19-question test of the CCK for gymnastics required in Turkish elementary and secondary schools. Participants were 240 preservice teachers who had previously taken a class in content knowledge for gymnastics in six state universities. Rasch modeling was used to evaluate the validity and reliability of the CCK gymnastics test. Results indicated good item model fit for all 19 items. High internal consistency for item difficulty and high internal consistency for person-ability were obtained. Overall analysis showed good evidence to support the validity and reliability of the CCK gymnastics test. The CCK test can be used in initial teacher education and continuing professional development to determine the CCK knowledge of preservice and inservice teachers and in turn a measure of what they learn from professional development efforts.