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Hillman CH Belopolsky AV Snook EM Kramer AF McAuley E 《Research quarterly for exercise and sport》2004,75(2):176-185
Electrocortical and behavioral responses of low, moderate, and high physically active older adults were compared with a younger control group on neutral and incompatible conditions of a flankers task. Compared to younger adults, high and moderate active older adults exhibited increased event-related potentials component P3 amplitude for the incompatible condition at the frontal electrode site. For the neutral condition, only low active older adults exhibited decreased amplitude at the central-parietal site, compared to younger adults. P3 latency revealed the longest latencies for low active older adults, followed by moderate active, high active, and younger adults, respectively. Reaction time (RT) data revealed that younger adults exhibited faster RT compared to all three older groups. Results suggest that physical activity may improve executive control function in older adults by affecting the distribution of P3 amplitude, which has been related to memory and attentional processes, and by decreasing P3 latency, which relates to the speed of cognitive processing. 相似文献
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In this review, we examine the original obesity paradox phenomenon (i.e. in cardiovascular disease populations, obese patients survive better), as well as three other related paradoxes (pre-obesity, "fat but fit" theory, and "healthy" obesity). An obesity paradox has been reported in a range of cardiovascular and non-cardiovascular conditions. Pre-obesity (defined as a body mass index of 25.0-29.9 kg · m?2) presents another paradox. Whereas "overweight" implies increased risk, it is in fact associated with decreased mortality risk compared with normal weight. Another paradox concerns the observation than when fitness is taken into account, the mortality risk associated with obesity is offset. The final paradox under consideration is the presence of a sizeable subset of obese individuals who are otherwise healthy. Consequently, a large segment of the overweight and obese population is not at increased risk for premature death. It appears therefore that low cardiorespiratory fitness and inactivity are a greater health threat than obesity, suggesting that more emphasis should be placed on increasing leisure time physical activity and cardiorespiratory fitness as the main strategy for reducing mortality risk in the broad population of overweight and obese adults. 相似文献
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A survey of over 2,000 craft makers in England and Wales undertaken in 2003 forms the basis of this study. It is compared with data from a previous national survey, enabling a unique longitudinal perspective on specific trends within this sector. The career paths travelled by makers between their initial training and forming their enterprises are explored and the dynamism of the sector and its potential contribution to the UK economy are made apparent. Three themes are addressed: the initial training of the makers; the emerging pattern of late entry to the sector; and, finally, individuals' career paths in the context of lifestyles and quality of life associated with working in the crafts. 相似文献
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Thirty rats received 10 sessions of baseline training in which leverpressing was reinforced according to a variable-interval (VI) 60-sec schedule. Twenty-four of the subjects were then assigned to one of four groups that received five sessions of extinction, with groups being differentiated in a 2 by 2 factorial design on the basis of: (1) changes in stimuli accompanying transportation of subjects from home cages to the laboratory and placement in the apparatus, and/or (2) changes in contextual stimuli within the apparatus. During the sixth session of extinction, the transportational and contextual stimuli previously associated with baseline training were reinstated. The remaining six rats experienced changes in both transportational and contextual stimuli but were maintained on the VI 60-sec schedule of reinforcement. Changes in either transportational or contextual stimuli reduced resistance to extinction and spontaneous recovery, and substantial increments in responding occurred upon reinstatement of the transportational and contextual stimuli associated with baseline training. Evidence for summation of the two sources of stimulus change was obtained. Changes in transportational and contextual stimuli produced only a brief disruption in responding when reinforcement of leverpressing was continued. 相似文献
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GEJZA M. TIMČÁK PETER KOŠĆ JURAJ PAŇKO 《European Journal of Engineering Education》1996,21(3):245-253
Electronic mail entered the Technical University Ko?ice in 1990. Now, instead of the few tens of users at the beginning, the system hosts thousands of them. Interactive teaching programmes as well as teaching programmes that are supported by audio and visual channels have also been used since 1990. The paper presents a short account of past development, the present situation and perspectives within the area of Internet use and of tuition that employs multimedia related means of teaching. 相似文献
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摘要：宇宙观是影响一个思想体系及社会制度的重要因素,传统武术体系的形成与发展也离不开对古代宇宙观的认识。为丰富武术哲学体系,揭示中国古代宇宙观与传统武术形成之间的哲学基础,主要采用文献资料法,在古文献史料的基础上阐述古人从对宇宙认识,从中提取传统武术哲学之精华,认为传统武术哲学的形成前提是对宇宙的认识,并超越了神论限制,走向发展的正途;中国古代气论、道论、太极发生论、宇宙生命整体论影响着传统武术哲学的本质观、修炼境界观、平衡观和武术哲学的基本理念。该研究不仅说明武学产生的思想基础,丰富了武学的认识论体系,而且揭示了传统武术哲学的发展过程与规律,对我们认识武学体系的内在精髓提供启示和借鉴。 相似文献
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The treatment of four issues related to aging was examined in this study: Social Security, civil rights, political power, and population trends in 19 secondary schools’ U.S. history and government textbooks. In these texts, only Social Security was given adequate treatment. The weakest area was “population trends.” The study concluded that for such a vital topic the coverage of aging issues in secondary textbooks was generally weak and insufficient. We recommend that the role of the aged throughout U.S. history should be addressed and that the rapid changes in demographics, particularly the “graying” of our population, should not be ignored in either history or government textbooks. Even with an expansion in texts of the four topics above, teachers will have to rely on supplementary materials as their primary sources of information. 相似文献
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D.T.D. James F. Gibson G. McAuley J. McAuley 《International Journal of Lifelong Education》2013,32(1):50-58
Some familiarity and competence with computers would improve older people's access to a range of technological developments that could make their lives safer, more convenient, intellectually more stimulating and more entertaining. Additionally, it might increase their self‐esteem and their acceptance as capable members of society. However, older people have mostly been prevented from acquiring computing skills because of the unavailability, until relatively recently, of suitable machines and because of the self‐perpetuating view that computers and the elderly are incompatible. This paper reports the experience of introducing a group of older people, whose mean age was approximately 70 and some of whom were physically frail, to computers, through the positively motivating and potentially therapeutic medium of personal life‐history writing. Compared to younger users, our participants expressed similar views about the ease‐of‐use of the computers, but less confidence in using them unaided and less certainty in re‐starting computer use after a few days’ absence. Much infectious enthusiasm has been generated among participants and all changes in their general mental health and attitudes to advanced technology have been in a strongly positive direction. Further work is aimed towards establishing a communications network for use by older people, while their particular learning requirements are being incorporated in self‐instruction software. 相似文献