The Effect of a Multicomponent Dual-Modality Exercise Program Targeting Osteoporosis on Bone Health Status and Physical Function Capacity of Postmenopausal Women

Purpose: Exercise is important for the prevention of osteoporosis and the reduction of fracture risk because it improves muscle mass and strength, besides improving balance. We evaluated the effect of a specific exercise program on bone mass and quality and physical function capacity in postmenopausal women with low bone mineral density. Methods: Participants (N = 125) underwent a bone mass (Dual X-ray Absorptiometry), bone quality (osteosonography), and physical functional capacity assessment. Fifty-eight of them took part in an 11-month exercise program (E), that included a multicomponent (strength, aerobic capacity, balance, joint mobility) dual-modality (on ground and in the water; alternating group and home-based exercise periods) exercise regimen. The others represented a control group (C) that did not exercise. After the exercise program all participants were reevaluated. Results: After the training program: femoral neck T-score significantly improved in E; C significantly decreased all bone quality (osteosonography) parameters, whereas E showed no differences; E significantly improved all the physical function capacity parameters, while most of them decreased or did not change in C. Conclusions: A specific exercise program targeting osteoporosis improves physical function capacity, reduces physiological bone loss, and maintains bone quality in low bone mineral density postmenopausal women.     

生活在广州

我的工作 我在广汽研究院任整车集成部的首席专业总工程师,我的团队负责汽车整车集成工作,也就是将车辆的各系统整合到一起,譬如发动机、底盘悬架、车身内饰、电子电器等等。     

The microeconometric estimation of treatment effects—An overview

Summary The need to evaluate the performance of active labour market policies is not questioned any longer. Even though OECD countries spend significant shares of national resources on these measures, unemployment rates remain high or even increase. We focus on microeconometric evaluation which has to solve the fundamental evaluation problem and overcome the possible occurrence of selection bias. When using non-experimental data, different evaluation approaches can be thought of. The aim of this paper is to review the most relevant estimators, discuss their identifying assumptions and their (dis-)advantages. Thereby we will present estimators based on some form of exogeneity (selection on observables) as well as estimators where selection might also occur on unobservable characteristics. Since the possible occurrence of effect heterogeneity has become a major topic in evaluation research in recent years, we will also assess the ability of each estimator to deal with it. Additionally, we will also discuss some recent extensions of the static evaluation framework to allow for dynamic treatment evaluation. The authors thank Stephan L. Thomsen, Christopher Zeiss and one anonymous referee for valuable comments. The usual disclaimer applies.     

RESEARCH REPORT

In this brief research report we demonstrate differences in quality of working life (QWL) in a Dutch data-set for workers in different household situations and conclude that a life course perspective is helpful in the study of QWL.     

Parental partnership and joblessness in childhood and their influence on young people's outcomes

Summary.  The paper estimates the relationship between several outcomes in early adulthood (education, inactivity, early birth, distress and smoking) and experiences of life in a single-parent family and with jobless parent(s) during childhood. The analysis is performed using a sample of young adults, who are selected from the first nine waves of the British Household Panel Survey (1991–1999) and can be matched with at least one parent and one sibling over the same period. This sample allows us to estimate the relationship of interest by using sibling differences. We also use another sample of young adults from the British Household Panel Survey, matched to at least one parent, to estimate more conventional level models and to compute nonparametric bounds and point estimates. The estimates based on sibling differences require weaker assumptions (compared with the assumptions that are imposed by nonparametric estimators under conditional independence and level estimators) for the identification of the effects of family structure and parental joblessness on the outcomes under analysis. We find that experiences of life in a single-parent family and with jobless parents during childhood are usually associated with disadvantageous outcomes for young adults, the effect of family structure is in general significantly greater (in absolute value) than the effect of parental worklessness and most of the unfavourable outcomes are linked to an early family disruption, when the child was aged 0–5 years, whereas the timing of parental joblessness during childhood has more complex effects, with different outcomes being more strongly influenced by parental worklessness at different ages of the child.     

Playstation and the Power of Unexpected Consequences

It has been suggested that research business strategy is like studying specimens on a wall. By examining successful stories, one can easily identify the strategic factors responsible for such a success, and the greater the success, the more evident those factors are. Timing, strategic positioning, pricing policies, lead-time - everything goes back to the place where it fits best, like a beautiful mosaic. Even competitors' mistakes become more evident, their dull misunderstanding of what the winner was planning as every successful move leads to an even more successful one. The case of Sony PlayStation, the most successful digital games console ever, is no exception and the temptation to explain the rationale behind such an achievement is almost irresistible. As this paper tries to suggest, sometimes ex- post rationalizations hide or avoid part of the truth. Despite PlayStation's success, Sony's strategic choices were, on more than one occasion, driven more by lucky coincidence than by long-range planning. Furthermore, this paper shows how some of the strategic factors behind PlayStation's winning run sprang from decisions taken by lack of alternatives, and that only in the very end was Sony able to understand their full profit potential.