Life goals and academic interests as predictors of extracurricular activities of secondary school sophomores

The life goals and interests of eighth-graders were examined in relation to their reported extracurricular activities in secondary school. In 1969, 204 females and 178 males, attending three feeder schools, completed the Vocational Sentence Completion Blank, a semiprojective measure of life goals, values, quests, aspirations hopes, preferences, and concerns. For the Milwaukee Academic Interest Inventory, which measures curricular interests, the complete test records of 183 females and 150 males were available. In 1971, all subjects reported about their participation in six secondary school activities. Approximately two-thirds of the 29 VSCB categories and all 7 MAII variables were predictive at a low level of association. The statistically significant relations between eighth-grade predictors and specific extracurricular activities in the first year of secondary school seemed reasonable. Implications for adolescent development were discussed.     

Do sporting activities convey benefits to bone mass throughout the skeleton?

It is well known that sport and exercise play an important role in stimulating site-specific bone mineral density (BMD). However, what is less well understood is how these benefits dissipate throughout the body. Hence, the aim of the present study was to compare the BMD (recorded at nine sites throughout the skeleton) of 106 male athletes (from nine sports) with that of 15 male non-exercising age-matched controls. Given that BMD is known to increase with body mass and peak with age, multivariate and univariate analyses of covariance were performed to compare the BMD of the nine sports groups with controls (at all sites) using body mass and age as covariates. Our results confirmed a greater adjusted BMD in the arms of the upper-body athletes, the right arm of racket players and the legs of runners (compared with controls), supporting the site-specific nature (i.e. specific to the externally loaded site) of the bone remodelling response (all P <0.01). However, evidence that bone mass acquisition is not just site-specific comes from the results of the rugby players, strength athletes, triathletes and racket players. The rugby players' adjusted BMD was the greatest of all sports groups and greater than controls at all nine sites (all P <0.01), with differences ranging from 8% greater in the left arm to 21% in the lumbar spine. Similarly, the strength athletes' adjusted BMD was superior to that of controls at all sites (P <0.05) except the legs. The adjusted BMD of the triathletes was significantly greater than that of the controls in both the arms and the legs as well as the thoracic and lumbar spine. The racket players not only had significantly greater right arm BMD compared with the controls but also a greater BMD of the lumbar spine, the pelvis and legs. In contrast, the low-strain, low-impact activities of keep-fit, cycling and rowing failed to benefit BMD compared with the age-matched controls. These results suggest that sporting activities involving high impact, physical contact and/or rotational forces or strains are likely to convey significant benefits not only to the loaded sites, but also to other unloaded peripheral and axial sites throughout the skeleton.     

Teaching Chemistry at Canada's Open University

University‐level courses in science that contain a substantial practicum or laboratory component have always been a problem to deliver through distance education. Because of the potential hazards inherent in the equipment and chemicals commonly used, chemistry is among the more challenging disciplines to teach at a distance. Athabasca University (AU) ‐ Canada's Open University ‐ has been successfully running chemistry courses for over two decades. The development and delivery of AU chemistry courses are described and the approaches that have been developed to meet the challenges of a North American distance‐education university, including the use of new technologies, are discussed. The problems associated with providing distance students with appropriate laboratory experience are also examined. The first‐year general chemistry courses are compared to an equivalent course at a neighbouring traditional university and an analysis of student performance in AU chemistry courses is presented.