Differences between the sexes in the three-dimensional angular rotations of the lumbo-pelvic-hip complex during treadmill running

The aims of this experiment were to determine whether there are differences between the sexes in the three-dimensional angular rotations of the lumbo-pelvic-hip complex during running and, if such differences exist, to establish whether factors other than sex can explain the observed differences. A cohort of 44 non-injured runners (22 males, 22 females) who usually ran more than 20 km per week were voluntarily recruited. All trials were conducted on a treadmill at a running speed of 4.0 m x s(-1). Reflective markers were placed over specific anatomical landmarks of the thoraco-lumbar spine, pelvis and femur. Data were captured using a VICON motion analysis system. Females tended to display a greater peak-to-peak oscillation for most of the angular rotations. An offset was the main difference between the male and female group mean waveforms for pelvis anterior-posterior tilt. Forward stepwise regression analysis revealed that sex was the most common variable related to the amplitudes of the angular rotations. Given these results, sport scientists conducting future biomechanical studies using angular data to test hypotheses are advised to be extremely cautious about averaging across male and female participants.     

Submaximal exercise and maturation in 12-year-olds

The aim of this study was to examine the maturation responses of young people to submaximal treadmill exercise. Body mass was controlled using both the conventional ratio standard and allometric modelling. Ninety-seven boys and 97 girls with a mean age of 12.2 years completed a discontinuous, incremental exercise test to voluntary exhaustion. We measured peak oxygen uptake (VO2peak) and VO2 when running at 8, 9 and 10 km x h(-1). Sexual maturation was assessed visually using Tanner's indices of pubic hair. Peak VO2 was significantly higher in boys (P<0.001); this was still the case when the influence of body mass was covaried out. During submaximal exercise, no significant differences in absolute VO2 were observed between the sexes (P>0.05); however, values of VO2, expressed both in ratio with body mass and adjusted for body mass using allometry, were significantly greater in boys than in girls (P<0.001). For absolute VO2, significant main effects (P<0.05) were seen for maturity at each exercise stage. With the influence of body mass controlled using either the ratio standard or allometry, no significant main effects (P>0.05) for maturity were observed. Our results indicate that boys are less economical than girls while running at 8-10 km x h(-1) and that, independently of body mass, maturation does not influence the VO2 response to submaximal exercise.     

In search of invariant athletic behaviour in sport: An example from championship squash match‐play

Analysis of competitive sport performance from a priori observation is frequently used to prepare an athlete for a future contest. This practice necessarily assumes that the observed athletic behaviours are invariant, in that the data from an earlier contest apply to the next. We report different analyses of championship squash matches from 1987 and 1988 in search of such invariance and thus a general signature of athletic behaviour. The results show that once the preceding condition to an athletic response (shot) becomes more detailed, by either accounting for where on court the previous shot was played to, or by pairing the previous shot with its own antecedent, the corresponding response becomes more predictable (P > 0.25). This is especially the case for a squash champion when the forehand and backhand characteristics of his shot response are accounted for. The finding that the champion is more consistent if his forehand and backhand shot responses to a preceding shot are analysed separately, shows that the level of analytic detail is an important consideration if the derived information from sport analysis is to prepare an athlete reliably for future sport competition. Finally, we consider sport competition from an ecological perspective with regard to the natural organization and stability of non‐linear systems in an attempt to explain the empirical data.     

“We Do It,but They Don't”: Multiple Categorizations and Work Team Communication

The present study adopted an intergroup approach to information sharing and ratings of work team communication in a public hospital (N?=?142) undergoing large-scale restructuring. Consistent with predictions, ratings of communication followed a double ingroup serving bias: while team members reported sending about the same levels of information to double ingroup members (same work team/same occupational group) as they did to partial ingroup members (same work team/different occupational group), they reported receiving less information from partial ingroup members than from double ingroup members and rated the communication that they received from partial ingroup members as less effective. We discuss the implication of these results for the management of information sharing and organizational communication.     

General Mass Communication

Jack Temple Kirby's Media-Made Dixie: The South in the American Imagination. (Baton Rouge, La.: Louisiana State University Press, 1978—$9.95)

Dan Nimmo's Political Communication and Public Opinion in America (Santa Monica, Calif.: Goodyear Publishing Co., 1978—price not given, but available in hard and paper editions)

Raymond G. Smith's The Message Measurement Inventory: A Profile for Communication Analysis (Bloomington, Ind.: Indiana University Press, 1978—$12.50)

Fred Fedler's An Introduction to the Mass Media (New York: Harcourt, Brace Jovanovich, 1978—price not given, paper)

Rolf Myller's Symbols and their Meaning (New York: Atheneum, 1978—$9.95)

William E. Francois, Mass Media Law and Regulation (Columbus, Ohio: Grid, Inc., 1978—price not given)

James Leigh and Claude R. Martin, Jr., Current Issues and Research in Advertising (Ann Arbor, Mich.: Graduate School of Business Administration, University of Michigan, 1978—$4.75, paper)

Philip Ward Burton's Advertising Copywriting (Columbus, Ohio: Grid, 1978—$12.95)

Postal and Allied Arenas–Research Task Specifications, Phase I: Arena Survey by John F. McLaughlin (October 1977, 39 pp., $10.90, paper, Working Paper W-77-9)

The Communications Act Policy Toward Competition: A Failure to Communicate by G. Hamilton Loeb (October 1977, 95 pp., $23.40, paper, Publication P-77-3)

Roland E. Wolseley's Careers in Religious Communications (Herald Press, Scottdale, Pa. 15683—$4.95, paper)

Roland Barthes' Image-Music- Text (New York: Hill & Wang, 1977—$8.95)

Jacques Barzun and Henry F. Graff's The Modern Researcher (New York: Harcourt Brace Jovanovich, 1977—$6.95 in paper, and also available in hardback)     

Measuring patients' communication apprehension about interacting with physicians: Instrument development

The purpose of these studies was to develop an instrument to measure patients' perceived communication apprehension in patient/physician interactions. In the first stydy, a five item Patients' Report of Communication Apprehension with Physicians (PRCAP) was developed. The scale appears to be a reliable, unidimensional scale which shows a moderate positive correlation with the Personal Report of Communication Apprehension (PRCA), a moderate negative correlation with willingness to communicate (WTC), and a moderate negative correlation with self‐perceived communication competence (SPCC). In the second study, designed to assess the predictive validity of the PRCAP, those who scored one standard deviation above the mean on the PRCAP reported being less satisfied with their interactions with physicians than those who scored one standard deviation below the mean on the PRCAP. It appears the PRCAP is a reliable and valid instrument that can be employed to pursue issues involving the role of CA in patient/physician interactions.