Auslaufvorgänge aus wasserbehältern-eine anwendungsorientierte einführung in die analysis

Ohne ZusammenfassungHerrn Professor Dr. E. Wittmann danke ich für wichtige Anregungen.     

An evaluation of biomechanical measures of bowling action legality in cricket

Cricket bowling is traditionally thought to be a rigid-arm motion, allowing no elbow straightening during the delivery phase. Conversely, research has shown that a perfectly rigid arm through delivery is practically unattainable, which has led to rule changes over the past years. The current rule requires a bowler not to increase the elbow angle by more than 15°, thus requiring a measurement to confirm legality in “suspect” bowlers. The aims of this study were to evaluate whether the current rule is maintained over a range of bowlers and bowling styles, and to ascertain whether other kinematics measures may better differentiate between legal and suspect bowling actions. Eighty-three bowlers of varying pace were analysed using reflective markers and a high-speed (240 Hz) eight-camera motion analysis system in a laboratory. The change in elbow segment angle (minimum angle between the arm and forearm), the change in elbow extension angle with respect to the flexion–extension axis of a joint coordinate system, and the elbow extension angular velocity at ball release were measured. We found that bowlers generally bowled within a change in elbow extension angle of 15°. However, this limit was unable to differentiate groups of bowlers from those who were suspected of throwing in the past. Improved differentiation was attained using the elbow extension angular velocity at ball release. The elbow extension angular velocity at ball release may be conceptually more valid than the elbow extension angle in determining which bowlers use the velocity-contributing mechanisms of a throw. Also, a high value of elbow extension angular velocity at ball release may be related to the visual impression of throwing. Therefore, it is recommended that researchers and cricket legislators examine the feasibility of specifying a limit to the elbow extension angular velocity at ball release to determine bowling legality.     

Teaching and learning under COVID-19 public health edicts: the role of household lockdowns and prior technology usage

Higher Education - Public health edicts necessitated by COVID-19 prompted a rapid pivot to remote online teaching and learning. Two major consequences followed: households became students’...     

The role of secondary education in explaining competitiveness

The literature establishes that education drives economic performance, but the extent that education is associated with a country's competitiveness is empirically untested. Our study analyses Programme for International Student Assessment (PISA) data from 63 countries to ascertain education's role in explaining the competitiveness of a country. Strong correlations were found for reading and science (each 53% shared variance) and mathematics (50%). Educational achievement explains 54% of Competitiveness. Regional differences were found with East Asia performing strongly both academically and in competitiveness, ahead of Europe, the rest of Asia, and South/Central America. Anglo-Saxon countries rank second academically behind East Asia, but in terms of competitiveness, the Anglo-Saxon cluster ranks first. We show that Anglo-Saxon countries' leadership in education and competitiveness have been challenged by East Asia. Our diachronic analysis shows that together with Competitive Industrial Performance, the cultural dimensions of Uncertainty Avoidance, Long-term Orientation and Indulgence Restraint, Education contributes to improvements in Competitiveness. The strength of East Asia in educational achievement will have implications for the region's future competitiveness compared to Anglo-Saxon and European countries. Our empirical findings support theoretical arguments for education's role in driving competitiveness. For education policy, the study emphasizes the importance of investments in reading, science and mathematics education.     

Participation in organized sports,physical education,therapeutic exercises,and non-organized leisure-time physical activity: how does participation differ between childhood cancer outpatients and healthy peers?

Most childhood cancer survivors are insufficiently active. Researchers are focusing on strategies to increase physical activity (PA). However, a detailed understanding of participation in specific types of PA is missing, meaning current strategies may lack relevant information. Thus, our study sought to analyze participation in different types of PA commonly engaged in by children: organized sports, physical education in school (PES), therapeutic exercise, and non-organized leisure-time PA. Thirty-eight childhood cancer outpatients and 51 healthy children completed questionnaires. Compared to healthy children, childhood cancer outpatients, especially those who are shortly after cessation of inpatient treatment, participated significantly less often in organized sports and PES and significantly more often in therapeutic exercise compared to the healthy children. Considering organized sports and PES afford children unique social benefits and provide the potential to motivate lifelong activity, future efforts should be placed on ensuring children with cancer can access these types of PA. Educating parents, teachers, and coaches, exploring referral pathways to exercise professionals and providing individual support may enhance participation rates in organized PA and should be investigated.     

Effects of Aerobic Exercise on Cognitive Performance Among Young Adults in a Higher Education Setting

Purpose: Acute benefits of aerobic exercise on executive functioning have been reported frequently under laboratory conditions. However, to date, a beneficial effect on long-term memory has been less well supported and no data are available regarding nonlaboratory conditions in young adults. The aim of the current study was to investigate acute effects of aerobic exercise on cognitive functioning in a university classroom setting. Method: Using a cross-over design, 51 participants performed a bout of moderately intense running (RUN) and read an article while seated (CON). Afterwards, they completed free-recall tests, followed by a Flanker task and an n-back task. Results: Participants in the RUN condition compared with those in the CON condition showed shorter reaction time on the inhibition task, F(1, 50) = 5.59, p = .022, η² = .101, and recalled more words in the immediate- and delayed-recall tests, F(1, 50) = 8.40, p = .006, η² = .144. Conclusion: The present findings suggest that a moderately intense bout of aerobic exercise benefits verbal short-term and long-term memory as well as inhibitory control among students in a classroom setting.     

Ten Years of CERI

Summaries

English

The purpose of this study was to determine whether the different value positions claimed by Macdonald to be inherent in his three curriculum development models resulted in differences in the content of science curricula and/or the organization of such content. Information on this subject was obtained from a sample of 90 randomly‐chosen science teachers vvho examined junior high school physical science curricula, then completed a questionnaire used as a measuring instrument. This instrument was based on established criteria for selecting and organizing content for a curriculum. From the results obtained, it was concluded that significant differences in content as well as in content organization did indeed exist in the science curricula representative of Macdonald's three models. Moreover, it was found that content representative of specifie groups of selection criteria such as discipline‐oriented, societal needs, and student needs was responsible for the differentiation in the content among the models. Thus, the findings supported Macdonald's contentions. This information should be useful in future science curriculum development.