Recovery of pulmonary diffusing capacity after maximal exercise

Abstract

Pulmonary diffusing capacity (Dl_co), together with spirometric variables, arterial oxygen tension (paO₂) and cardiac output were determined before and at intervals after maximal arm cranking, treadmill running and erogmeter rowing. Independent of the type of exercise, Dl_co increased immediately post‐exercise from a median 13.6 (range 7.3–16.3) to 15.1 (9.3–19.6) mmol min^‐1 kPa^‐1 (P <0.01). However, it decreased to 11.6 (6.9–15.5) mmol min^‐1 kPa^‐1 (P <0.01) after 24 h with cardiac output and paO₂ at resting values, and Dl_co normalized after 20 h. Thoracic electrical impedance at 2.5 and 100 kHz increased slightly post‐exercise, indicating a decrease in thoracic fluid balance, and there were no echocardiographic signs of left ventricular failure at the time of the decrease in Dl_co. Also, active muscle (limb) circumference and volume, and an increase in haematocrit from 43.8 (38.0–47.0) to 47.1 (42.7–49.8) (P <0.01), had normalized at the time of the decrease in Dl_co. Vital capacity, forced vital capacity, forced expiratory volume in 1 s, peak and peak mid‐expiratory flows did not change. However, total lung capacity increased from 6.8 (5.0–7.6) to 7.0 (5.1–7.8) litres (P <0.05) immediately after exercise and remained elevated at 6.9 (5.1–8.7) litres (P <0.05) when a decrease in Dl_co was noted. The results demonstrate that independent of the type of maximal exercise, an approximate 15% reduction in Dl_co takes place 2–3 h post‐exercise, which normalizes during the following day of recovery.     

Training effects on contrafreeloading in rats housed in operant chambers

Four rats were trained to press a bar for food pellets and then were housed in operant chambers for 6 continuous days of choice-testing between obtaining pellets freely or by barpressing. There were two additional 3-day choice periods following more barpress training. It was found that (1) animals preferred to secure food by barpressing when initially placed in the choice situation and immediately following additional barpress training; (2) there was a subsequent decrease to very low levels of response-dependent food taken during choice testing; and (3) opening the chambers for daily maintenance during choice-testing caused a temporary increase in barpressing for food. Thus the previously reported stability of high rates of barpressing in the presence of free food is, at least in part, dependent upon short testing sessions.     

The Language Proficiency Profile-2: Assessment of the Global Communication Skills of Deaf Children Across Languages and Modalities of Expression

Data are presented from two studies that investigate the developmental trends and concurrent validity of a measure of language and communication skills for deaf children, the Language Proficiency Profile-2 (LPP-2), developed by Bebko and McKinnon (1993). The LPP-2 was designed to evaluate the overall linguistic/communicative skills of deaf children, independent of any specific language or modality of expression. It focuses on the totality of the children's communication skills. Experiment 1 investigated developmental trends of the LPP-2 for both deaf and hearing children, studying a combined sample of deaf and hearing children from the United States and Canada. Experiment 2 investigated the relationship between the LPP-2 and two commonly used measures to assess deaf children on language development (Preschool Language Scale-3) and early reading skills (Test of Early Reading Ability-Deaf/Hard-of-Hearing). Results from the two studies indicate that the LPP-2 has good utility not only as a measure of overall language development but also as a predictor of achievement for English language and early reading skills.     

Lifelong learning policy in two national contexts

This article describes and discusses the development of lifelong learning policy in two EU member states, Denmark and Portugal. The purpose is to show how different societal and historical contexts shape the development and implementation of lifelong learning policies, even though these policies have significant common elements. As a basis for the discussion an inventory of policy elements is presented. Denmark and Portugal have been chosen as examples of smaller EU member states with different historical, social and cultural characteristics. Developments and policies in the two countries, including the links with EU education policy, are described. The discussion includes comparison drawing on the inventory of policy elements. A main conclusion is that the different historical trajectories of the two countries remain very important for present-day education and for the advancement of lifelong learning policy. Early development of public primary education and popular adult education has provided a strong foundation for lifelong learning policy in Denmark while in Portugal not only institutional provision but also popular demand for lifelong learning has had to be built up relatively recently. EU education policy has had much more impact on lifelong learning policy in Portugal than in Denmark, because Portugal has had to depend much more on economic support from the EU social fund.     

How parental and school responses to choice policies reconfigure a rural education market in Victoria,Australia

Market principles now dominate the education and social policies of many Anglophone countries, including Australia, but articulate differentially within specific contexts. Existing historical legacies, local economic and social conditions, and geographical settings interact with federal and state funding and transport policies to shape the nature of regional education markets and the choices families make in a rural school market in Australia. Through two school case studies, this article explores the effects of policy shifts on parental choice and student movement within a regional Victorian community. Informed by policy sociology, the article views the policy as a dynamic, often ad hoc process with contradictory effects. It indicates how an ensemble of federal and state funding and conveyancing policies enable some schools to develop marketing practices that reconstruct the local education market to their advantage through the introduction of transport and flexi-boarding policies. It demonstrates that education markets are not confined to urban settings and that while choice is not a new phenomenon in this rural area, federal and state funding and transport policies have reconfigured local markets and intensified the market work undertaken by schools and parents with, in this instance, unequal effects on the provision of schooling in a rural region.     

Pressures,rewards and teacher retention: a comparative study of primary teaching in England and Finland

The article presents some findings from the York‐Jyväskylä Teacher Professionalism project. The project was a follow‐up study to earlier case‐study research in six schools in Finland and six schools in England on the impact of educational reforms on teachers' work. Data were collected by re‐interviewing a sample of teachers from the original schools six years later. The views of English and Finnish teachers concerning the ways in which changes in practice, pay and working conditions affected their perception of teaching as a profession are contrasted. The crucial factors discouraging teachers from remaining in teaching were work intensification, low pay, deteriorating pupil behaviour and a decline in public respect. Positive influences on teacher retention were commitment to children, professional freedom and supportive colleagues. Suggestions are offered as to how policy makers should act to preserve the commitment of primary teachers and to promote their retention.     

The casualisation of teaching and the subject at risk

The casualisation of teaching in Australian higher education has come to be problematised as a risk to the quality of teaching and learning. However, the potential and location of risk, and therefore what constitutes an appropriate institutional intervention, requires interrogation as universities comply with the various regulations that, on the one hand, legitimise further casualisation in the name of flexibility, and on the other, insist on institutional responsibilities in the performance of quality. Taking a critical approach to risk consciousness, this paper examines the way casualisation is produced through workplace reform and problematised as a danger to the student learning experience through the quality agenda in Australian higher education. By examining the tensions between the discourses of flexibility and quality, the authors argue that casualisation should not simply be understood as a problem with individual teaching expertise that can be overcome through formal training of the individual. The neo-liberal political rationality that seeks to individuate responsibility and locate “risk” in this way masks the broader systemic tensions within the culture of the university which the authors argue have increasingly profound consequences for the quality of university education. Arguing that professional learning and quality enhancement are the product of open collaborative and collegial social practice, the authors conclude that addressing casualisation only in terms of systematic teacher training is a politically expedient response to a highly complex political issue facing Australian universities. Drawing on professional learning literature, the authors argue for a shift in policy and practice within the university to recognise, value and integrate the expertise and potential quality contribution of casual teaching staff at a micro-level with a particular focus on the teaching team.     

Reducing School Exclusions: An evaluation of a multi-site development project

The article reports the findings of an evaluation of a 1996-1999 British Home Office funded project which placed social work trained home-school support workers in comprehensive schools with the aim of reducing school exclusions. Set in the context of a review of the research evidence for the reasons for rapidly rising school exclusions in England during the 1990s, quantitative and qualitative data are analysed in relation to the impact of the project on rates of fixed-term and permanent exclusions. Exclusions were considerably reduced by a variety of strategies adopted by the support workers and over the three-year project duration permanent exclusions were cut by 25%. It is argued that teacher social workers are helpful in alleviating the conflict between the New Labour government's Standards agenda and its Inclusion agenda.