低氧暴露后提高平原运动能力的非血液学机制

在过去五十多年中,高原训练常被应用于优秀耐力运动员,旨在提高其平原的运动能力.大多研究认为,高原适应的优势主要集中在血液学方面,即提主平原运动能力的主要机制是高原环境下氧气利用下降激发红细胞生成加速反应,从而起红细胞量、 VO2max和竞技能力的提高.     

A comparison of the physiological response to simulated altitude exposure and r-HuEpo administration.

Concerns have been raised about the morality of using simulated altitude facilities in an attempt to improve athletic performance. One assumption that has been influential in this debate is the belief that altitude houses simply mimic the physiological effects of illegal recombinant human erythropoietin (r-HuEpo) doping. To test the validity of this assumption, the haematological and physiological responses of 23 well-trained athletes exposed to a simulated altitude of 2650-3000 m for 11-23 nights were contrasted with those of healthy volunteers receiving a low dose (150 IU x kg(-1) per week) of r-HuEpo for 25 days. Serial blood samples were analysed for serum erythropoietin and percent reticulocytes; maximal oxygen uptake (VO2max) was assessed before and after r-HuEpo administration or simulated altitude exposure. The group mean increase in serum erythropoietin (422% for r-HuEpo vs 59% for simulated altitude), percent reticulocytes (89% vs 30%) and VO2max (6.6% vs -2.0%) indicated that simulated altitude did not induce the changes obtained with r-HuEpo administration. Based on the disparity of these responses, we conclude that simulated altitude facilities should not be considered unethical based solely on the tenet that they provide an alternative means of obtaining the benefits sought by illegal r-HuEpo doping.     

Business Action Learning Tasmania (BALT) – an account of practice

Business Action Learning Tasmania’s (BALT) mission is self-reliant industry development, with diverse companies co-operating to improve their profitability, develop their people and grow the local economy. This is achieved through collaborative action learning, with companies working together on projects of vital importance and sharing the learnings. The Tasmanian economy has been in decline for several years due to relative isolation, rising costs of freight, labour, energy and capital, skills shortages, and a high Australian dollar. BALT demonstrates the potential for self-directed action learning between organisations in a regional area to grow the local economy. BALT evolved from an initial Lean Action Learning program conducted in Tasmania in 2010. Since then 5 programs involving 13 companies have been completed, with a further 2 programs and 7 projects underway at time of writing. Representatives from participating companies have played a leading role, with support from the Tasmanian Government. This Account of Practice describes outcomes achieved, evaluation methods, lessons learnt and future aspirations for BALT.     

Do Latino Youth Really Want to Get Pregnant?: Assessing Pregnancy Wantedness

Despite recent declines, Latinas bear a disproportionate burden of teen births. Understanding social, cultural, and demographic factors underlying pregnancy desire among Latino adolescents is needed to design effective teen pregnancy prevention interventions.

A questionnaire was completed by 794 Latino youth including a “pregnancy wantedness scale” (PWS) to assess attitudes toward an early pregnancy and socio-demographic variables. Regression analyses examined the association between these variables and PWS score. PWS scores for all groups were below but near the midpoint, suggesting ambivalence toward an early pregnancy. Being female, older, acculturated, using hormonal contraception, living with parents, and having an educated mother were significantly associated with lower PWS scores, but impacted youth differently depending on their sex and sexual experience. Multi-component Latino teen pregnancy prevention strategies should address behavioral and attitudinal differences based on sex and sexual experience and acknowledge the contribution of social determinants on pregnancy intentions.     

On the Use of Empirical Research for the Development of a Theory of Pedagogy

While philosophical scholarship and empirical research are frequently presented as discrete activities, I argue that both are essential to a project such as developing a theory of pedagogy. Functions and limits of philosophical work are outlined as background to my argument for systematic data gathering about the operation of power in pedagogy. Drawing upon work which is primarily philosophical in character from both radical pedagogy literature and Foucaultian literature, an empirical study is outlined. Examples are presented which demonstrate the benefits to be gained from employing both types of intellectual activity.     

The influence of student learning characteristics on purchase of paper book and eBook for university study and personal interest

First-year university students (n = 199) completed an online questionnaire that queried their purchase of paper books and eBooks for university study and personal interest. The questionnaire also required students to rate their learning characteristics including reading strategies, study self-regulation, learning control beliefs and achievement motivation. Self-reported student learning characteristic scores were associated with self-reported book purchases. For example, as student extrinsic motivation scores increased, number of paper books purchased for university study tended to increase. As student learning control belief scores increased, purchase of eBooks for university study tended to increase. Collectively, such results lend support to the conclusion that education students who embrace emerging technologies such as eBooks and who read for leisure perceive themselves as more able learners than students who do not embrace emerging technologies such as eBooks and who do not read for leisure.