Effect of a prolonged altitude expedition on glucose tolerance and abdominal fatness

In the present study, we investigated the effect of a long-term mountain expedition on glucose tolerance and insulin action. Twelve registered mountaineers ages 31 years (SD = 1.1) participated in a 25-day expedition at a 2,200-3,800-m altitude with an average duration of 8 hr per day. Arterial oxygen saturation (SaO2) was substantially reduced during hiking. Glucose tolerance and insulin responses were measured prior to and twice during the expedition period. Maximal oxygen consumption increased from 43.0 +/- 2.7 to 49.1 +/- 2.2 mL/kg/min. Percentage of body fat decreased from 19.4 +/- 6.8% to 16.9 +/- 5.9%. The area under the curves for insulin and glucose during the oral glucose tolerance test were also reduced in Days 3 and 25. The present study demonstrated that altitude hiking activity is an effective lifestyle intervention to improve insulin action.     

Science teachers' social conscience and the role of controversial issues in the teaching of science

The increasing number and variety of controversial scientific and technological issues with which citizens are confronted has led, in recent years, to calls for a schooling of science which prepares future citizens for participation in resolving such issues. We examined the social conscience of science teachers as it bears on the teaching of controversial issues. The study was conducted by interviewing teachers in two widely different English-speaking locations, Scotland and the United States. The research explores the perceptions of teachers with regard to the teaching of controversial issues, the problem of handling personal value positions when dealing with issues, and the tension that exists between the teaching of controversial issues and traditional value-free science curricula. © 1996 John Wiley & Sons, Inc.     

Book Review

Book reviewed in this article:
Educational Measurement, Third Edition R. L. Linn (Ed.)     

Using multimedia to teach personal safety to children with severe learning difficulties

This paper presents a review of the use of computer technology as a medium to teach personal safety skills to young people with severe learning difficulties. The authors, working from the Psychology Department of Glasgow Caledonian University, present two main areas which they considered when designing teaching materials for these pupils. Firstly, pupils with severe learning difficulties may not understand the appropriate language for sexual issues. Materials based on the ability to speak, listen, read or write will not produce a deep level of understanding about the topic. Secondly, pupils with severe learning difficulties may find acting out a situation through role play difficult. The authors describe their use of computer technology as a possible solution to these areas and illustrate the personal experiences of educators following this novel use of multimedia.     

Collective Efficacy, Support for Democratization, and Political Participation in Hong Kong

Public opinion studies have conventionally treated politicalefficacy as a two-dimensional concept involving internal andexternal efficacy. The former refers to people’s beliefsabout their individual abilities to understand politics, andthe latter refers to people’s beliefs about governmentresponsiveness. The present study reexamines and goes beyondthis two-dimensional view. It proposes that collective efficacy,defined as a citizen’s belief in the capabilities of thepublic as a collective actor to achieve social and politicaloutcomes, can be considered as a third dimension of politicalefficacy. Based on this three-dimensional view, the relationshipbetween political efficacy, support for democratization, andpolitical participation in Hong Kong is examined. Analysis ofa representative survey (N = 800) shows that both support fordemocratization and political participation are positively relatedto collective efficacy and negatively related to external efficacy.Internal efficacy, on the other hand, has only a limited relationshipwith the dependent variables, though high levels of internalefficacy are found to be a condition for collective and externalefficacy to exert stronger impact on political attitudes andbehavior. It is argued that two characteristics of the HongKong society—as a transitional society and a collectivistculture—contribute to the significance of collective efficacyin the public opinion process. But the relevance of collectiveefficacy to other contexts is also discussed.     

Acquisition of inductive biconditional reasoning skills: Training of simultaneous and sequential processing

One hundred forty-four 10th-grade students received training on one of three processing methods: coding-mapping (simultaneous), coding only, or decision tree (sequential). Then they learned a biconditional rule under one of eight transfer test conditions based on a 2 (paradigm: rule vs complete learning) × 2 (memory aids: 0 vs 4) × 2 (focus instance: presence vs absence) design. Although the coding-mapping students processed concept instances in much the same way as the coding-only students, they acquired the target rule more frequently, and they processed instances more quickly and more consistently than the decision-tree students. The observed ordinality of the responses of four truth-table classes was found to be more consistent with the simultaneity than with the sequentiality hypothesis. As expected, training interacted with paradigm and also with memory aids and focus instance. The induced simultaneous processing strategy apparently works optimally under rule learning, while the sequential strategy is difficult to induce and/or not optimal for rule-learning operations.