Effects of golf shaft stiffness on strain, clubhead presentation and wrist kinematics

The aim of this study was to quantify and explain the effect of shaft stiffness on the dynamics of golf drives. Twenty golfers performed swings with two clubs designed to differ only in shaft bending stiffness. Wrist kinematics and clubhead presentation to the ball were determined using optical motion capture systems in conjunction with a radar device for capturing ball speed, launch angle, and spin. Shaft stiffness had a marginally small effect on clubhead and ball speeds, which increased by 0.45% (p < 0.001) and 0.7% (p = 0.008), respectively, for the less stiff club. Two factors directly contributed to these increases: (i) a faster recovery of the lower flex shaft from lag to lead bending just before impact (p < 0.001); and (ii) an increase of 0.4% in angular velocity of the grip of the lower flex club at impact (p = 0.003). Unsurprisingly, decreases in shaft stiffness led to more shaft bending at the transition from backswing to downswing (p < 0.001). Contrary to previous research, lead bending at impact marginally increased for the stiffer shaft (p = 0.003). Overall, and taking effect sizes into account, the changes in shaft stiffness in isolation did not have a meaningful effect on the measured parameters, for the type of shaft investigated.     

Can losing teams cope with destructive voice behaviour? The role of game results and athletes’ perceived motivational climate

This study examined the relation between losing a game and players’ destructive voice about the coach. As team performances would suffer when such behaviours are not managed properly, we tested the motivational climate as a potential mechanism by which coaches can manage these destructive behaviours. Twelve volleyball and basketball teams (N = 136) were weekly assessed during eight weeks using questionnaires. Players rated the extent to which their teammates expressed destructive voice about their coach. Each player’s indegree centrality (i.e. the average score received from all teammates) functioned as measurement of his/her destructive voice about the coach. As hypothesized, losing a game increased players’ expression of destructive voice about the coach. At both the within- and between-person level, perceived mastery (performance) climate negatively (positively) predicted players’ destructive voice about the coach. When players perceived a more salient performance climate than usual after a loss, their increase in destructive voice about the coach was magnified. These results highlight the dynamics of players’ destructive voice about the coach and how a single loss can start the utterance of such voice. A coach would be able to counter this process by increasing the focus on a mastery rather than a performance climate.     

Influence of shaft length on golf driving performance

The aim of this study was to determine how shaft length affects golf driving performance. A range of drivers with lengths between 1.168 m and 1.270 m, representing lengths close to the 1.219 m limit imposed by R&A Rules Limited (2008), were assembled and evaluated. Clubhead and ball launch conditions and drive distance and accuracy were determined for seven category 1 golfers (handicaps 0.21 +/- 2.41) who performed shots on a purpose-built practice hole. As shaft length increased from 1.168 m to 1.270 m, initial ball velocity increased (+ 1.8 m/s, P < 0.01). Ball carry (+ 4.3 m, P = 0.152) also increased, although not significantly so. Furthermore, as shaft length increased, for all club comparisons there was no decrease in accuracy. Ball launch conditions of spin components and launch angle remained unaffected by shaft length. Launch angle increased (0.8 degree, F = 1.074, P = 0.362) as driver shaft length increased. Our results show that clubhead and ball velocity together with ball carry tended to increase with no loss of accuracy.     

Teaching,Teacher Education,and the Humanities: Reconsidering Education as a Geisteswissenschaft

In this essay Gert Biesta asks what the humanities can contribute to the field of teacher education. In addressing this question he turns to the idea of education as a Geisteswissenschaft as it was developed in the German‐speaking context in the first decades of the twentieth century. In this conception, education is configured as an interested academic discipline that engages with normative questions concerning the telos of education and does so with a focus on meaningful human action rather than human behavior. Viewing education this way highlights the role of value judgments in teaching. The values that are at stake in such judgments, Biesta argues, are not to be understood as moral values but as educational values, a view that raises some important questions about the specific nature of educational normativity. In a final step Biesta discusses how the idea of education as a Geisteswissenschaft makes a difference for the field of teacher education.     

Cultivating humanity or educating the human? Two options for education in the knowledge age

Ever since the idea of the ‘knowledge society’ came into circulation, there have been discussions about what the term empirically might mean and normatively should mean. In the literature we can find a rather wide spectrum, ranging from a utilitarian interpretation of the knowledge society as a knowledge economy, via a more humanistic conception of the knowledge society as a knowledge sharing society, up to an explicitly political interpretation of the knowledge society as a knowledge democracy. Although in theory there is a wide range of interpretations and manifestations, in practice there has been a strong convergence towards the idea of the knowledge society as a knowledge economy. On this interpretation the particular task for education is seen as that of the production of flexible lifelong learners who are able to adjust and adapt to the ever-changing conditions of global capitalism. In this paper I raise the question how we might conceive of the educational task in light of the particular expectations that come from such an interpretation of the knowledge society. Against the idea that an adequate response requires that educators focus on the cultivation of the human being’s humanity, I challenge the humanistic underpinnings of the idea of education as cultivation. Instead, I suggest a different direction that moves the educational task away from the cultivation of the self towards the exposure towards the world.     

Determination of the swing technique characteristics and performance outcome relationship in golf driving for low handicap female golfers

Previous studies on the kinematics of the golf swing have mainly focused on group analysis of male golfers of a wide ability range. In the present study, we investigated gross body kinematics using a novel method of analysis for golf research for a group of low handicap female golfers to provide an understanding of their swing mechanics in relation to performance. Data were collected for the drive swings of 16 golfers using a 12-camera three-dimensional motion capture system and a stereoscopic launch monitor. Analysis of covariance identified three covariates (increased pelvis-thorax differential at the top of the backswing, increased pelvis translation during the backswing, and a decrease in absolute backswing time) as determinants of the variance in clubhead speed (adjusted r (2) = 0.965, P < 0.05). A significant correlation was found between left-hand grip strength and clubhead speed (r = 0.54, P < 0.05) and between handicap and clubhead speed (r = -0.612, P < 0.05). Flexibility measures showed some correlation with clubhead speed; both sitting flexibility tests gave positive correlations (clockwise: r = 0.522, P < 0.05; counterclockwise: r = 0.711, P < 0.01). The results suggest that there is no common driver swing technique for optimal performance in low handicap female golfers, and therefore consideration should be given to individual swing characteristics in future studies.     

Effective learning activities in observation taks when learning to write and read argumentative texts

On repeated occasions, observational learning has proved itself to be an effective instruction method. Experimental studies have shown to be effective for complex tasks such as reading and writing for both teachers and students as models. The problem when interpreting the results of such research is that, in observation tasks, several mental activities play a simultaneous role. In this study we therefore set out to identify the effective elements of observation tasks. We focused on two elements of the observation tasks, both aimed at stimulating monitoring activities: evaluation of the model’s performance and elaboration on this evaluation. We have also distinguished between elaboration on the observed products (the models’ written answers), and elaboration on the observed processes (the models’ verbalisations of their mental activities). The data were subjected to a LISREL analysis. First of all, it was observed that subjects who performed “evaluation” and “productelaboration” better, and “process-elaboration” more often in one lesson, also performed these activities better or more often in the subsequent lesson. Next, we observed an effect of aptitude on the learning activities: pre skill scores influence “evaluation” and “product-elaboration”. The most important finding is that “evaluation” and “product-elaboration” contribute positively to argumentative writing skills. It is discussed that these findings confirm the importance of the monitoring, evaluative and reflective activities when learning complex tasks as writing.     

In search of an effective source use pattern for writing argumentative and informative synthesis texts

Reading and Writing - In order to design effective instruction and feedback for synthesis writing on both writing processes and products, a clear insight into synthesis writing processes underlying...     

BOOK REVIEWS

COMMUNITY IN CRISIS: THE ELIMINATION OF SEGREGATION FROM A PUBLIC SCHOOL SYSTEM. By James H. Tipton.
THE MEANING OF THE GLORIOUS KORAN. Translated by Mohammed Marmaduke Pickthall.
PUBLIC EDUCATION UNDER CRITICISM.M. Hill. New York: Prentice-Hall, 1954. 414 pages. $6.35. Edited by W. Winfield Scott and Clyde
INQUIRY INTO INQUIRIES: ESSAYS IN SOCIAL THEORY. By Arthur F. Bentley.
POWER OF WORDS. By Stuart Chase in collaboration with Marian T. Chase.
GREAT HUMAN ISSUES OF OUR TJMES. By Harold Benjamin, Kenneth Cooper, Willard Gosh, Clifton L. Hall, Claude Chadwick, James L. Hymes, Jr., Henry H.Hill and William Van Til.
PUBLIC EDUCATION AND ITS CRITICS. New York: The Mac-millan Company, 1954. 170 pp. $2.50. (Kappa Delta Phi Lecture.) By V. T. Thayer.