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

Chen MT  Lee WC  Chen SC  Chen CC  Chen CY  Lee SD  Jensen J  Kuo CH 《Research quarterly for exercise and sport》2010,81(4):472-477

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.  相似文献   

The development of the solarized latent image     

A.P.H. Trivelli  E.C. Jensen 《Journal of The Franklin Institute》1931,212(3):351-367

An investigation has been made of the development of the solarized latent image with p-amino-phenol, pyrogallol and hydroquinone developer without potassium bromide, and with a series of hydroquinone developers containing potassium bromide from 0.002N to 0.269N solution. These developers represent a series with different reduction potentials. The investigation was restricted to a pure silver bromide emulsion.It was shown by the application of the Bravais-Pearson method of determination of the correlation coefficient that A. H. Nietz' straight line proportionality between density and the logarithm of the potassium bromide concentration holds in general for normal exposures, but that in extreme cases of exposure and development, deviations from the straight line proportionality are detectable. This proportionality holds only in a limited way for the solarization region. At the threshold of the first reversal of the solarization there is no correlation at all.The criterion that a family of curves has, or has not, a tie-point was investigated by the determination of the correlation coefficient between density and gamma. It was shown that the tie-point of the solarization curves moves toward the origin of the distance/log E axes with increasing content of potassium bromide in the developer.  相似文献   

Decrease in pulmonary diffusion capacity after maximal exercise     

B S Rasmussen  B Hanel  K Jensen  B Serup  N H Secher 《Journal of sports sciences》1986,4(3):185-188

Oppression of the chest, cough and orthopnea are well known to occur in some athletes after competitions, maybe reflecting an increase in lung water. In order to indicate if lung water increases after maximal exercise we measured pulmonary diffusion capacity before and 2.1 h after a short maximal arm exercise bout in 11 canoeists and showed a decrease of 6.7%. The result may be explained by a calculated 17% increase in alveolar interstitial volume.  相似文献   

Reform der Sportlehrer-Ausbildung     

Hans-Gert Artus  Norbert Baumann  Reiner Bussek  Hermann Gall  Hans Jensen  Christiane Müller  Konrad Stripp  Claus Tiedemann  Peter Weinberg  Clemens Menze 《Sportwissenschaft》1974,4(1):99-103

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A test of a linear programming model as an optimal solution to the problem of combining methods of reading instruction     

James W. Mills  Philip K. Jensen  Martin Hershkowitz 《Instructional Science》1973,2(2):215-233

Traditional research on the methods used in teaching developmental reading at the higher educational levels has focused on either an examination of one method or a comparison of different methods. An important problem which has been largely ignored is that of developing rationales and methods for combining different methods on an individualized basis. Linear programming provides a mathematical model for determining an optimal combination of available methods in accordance with the student's original levels of input, expected gains, and goals. The study reported herein tested an application of the Linear Programming Model at the Reading Clinic of Drew University. Results, while not conclusive, indicate that this approach yields greater gains in speed scores than a traditional approach for this population.This study was made possible by a grant from the ESSO Education Foundation to Drew University of Madison, N. J. Part of this presentation is adapted from an earlier statement of the problem (Hershkowitz et al., 1969). An earlier version of this paper was presented at the Operations Research Society of America, 41st National Meeting.Currently, Associate Professor in the Psychology Department; was Director of the Reading Clinic at the time of the study.Chairman of the Psychology Department.Currently, Senior Scientist of the Planning Systems Division, Operations Research, Incorporated; was Project Manager for Educational Research and Evaluation, Automation Industries, Incorporated, Vitro Laboratories Division, at the time of the study.  相似文献   

Preventing alcohol-exposed pregnancy among American-Indian youth     

Jamie Jensen  DenYelle Baete Kenyon  Jessica D. Hanson 《Sex education》2016,16(4):368-378

Research has determined that the prevention of alcohol-exposed pregnancies (AEP) must occur preconceptually, either by reducing alcohol intake in women planning pregnancy or at risk for becoming pregnant, or by preventing pregnancy in women drinking at risky levels. One such AEP prevention programme with non-pregnant American-Indian (AI) women is the Oglala Sioux Tribe (OST) Changing High-risk alcohOl use and Increasing Contraception Effectiveness Study (CHOICES) Programme, which shows promise in reducing AEP risk in AI women aged 18 or older. A community needs assessment was conducted with key informant interviews and focus groups with an emphasis on how to expand OST CHOICES. To identify relevant inter-related themes, a content analysis was conducted on qualitative feedback from the focus groups and interviews. Altogether, key informant interviews were completed with 25 health and social service professionals. Eight focus groups were held with 58 AI participants, including adult women of child-bearing age, elder women, and adult men. Several sub-themes regarding the prevention of AEP with youth were identified, expanding the OST CHOICES curriculum into the schools, and the role of family and culture within AEP prevention.  相似文献   

Comprehensive Guidance: Implementation standards and career planning in Utah schools: The sixth C—Coordination     

R. Lynn Jensen Ed.D. 《Journal of Career Development》1996,23(1):61-72

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The Responsive State and Teachers     

Knud Jensen 《欧洲师范教育杂志》1995,18(2-3):187-196

Important developments in the Danish political situation are described. Emphasis is upon the relations between changes in politicians’ understanding and how the emergence of what has been called the ‘Responsive State’ might influence schooling and teachers’ work. Three changes of educational policy in Denmark are particularly relevant: (1) since 1991 a new system of govemment for schools; (2) an agreement, signed in 1992, redefining the contractual status of teachers; (3) a new school act of 1993, operational since August 1994, designed to reform the broad aims of the schooling System and the design and content of the curriculum. Broader political trends to these particular policy shifts are reviewed and discussed. They can be seen as a heavy attack on teaching as a profession; they seek to increase the influence and power of parents and politicians at the level of the local community and reduce further the influence teachers have on their own work. It is important to consider these policies against a consideration of how teachers themselves perceive and define their conditions of work. Three investigations are presented. Teachers are concerned about: (a) democratic educational values, (b) their students and their own qualifications, and (c) relations with parents to whom they feel accountable.  相似文献   

The Impact of Emotions on Student Achievement in Synchronous Hybrid Business and Public Administration Programs: A Longitudinal Test of Control‐Value Theory*     

Nikolaus T. Butz  Robert H. Stupnisky  Reinhard Pekrun  Jason L. Jensen  Dana M. Harsell 《Decision Sciences Journal of Innovative Education》2016,14(4):441-474

Synchronous hybrid delivery (simultaneously teaching on‐campus and online students using Web conferencing) is becoming more common in higher education. However, little is known about students’ emotions in these environments. Although often overlooked, emotions are fundamental antecedents of success. This study longitudinally examined the role of students’ emotions (enjoyment, anxiety, and boredom), perceptions of control, value, and success in synchronous hybrid learning environments. In particular, the investigation assessed students’ self‐reported enjoyment, anxiety, and boredom as predictors of their program achievement and successful technology use. Students were recruited from synchronous hybrid MBA and MPA programs. Control‐value theory of emotions was used as the theoretical framework. Paired samples t‐tests revealed that the achievement domain, compared to the technology domain, yielded higher mean scores for control, value, enjoyment, anxiety, and boredom. In addition, mixed ANOVAs indicated an interaction effect in which group means for program boredom were significantly higher for on‐campus students than for online students. Intercorrelations in each domain showed that perceived success was positively related to enjoyment and negatively related to anxiety and boredom. Technology‐related anxiety was also found to fully mediate the positive effect of control on perceived success in using technology.  相似文献   

“I Forgot I Wasn’t Saving the World”: the Use of Formative and Summative Assessment in Instructional Video Games for Undergraduate Biology     

Kathryn L. Lookadoo  Eryn N. Bostwick  Ryan Ralston  Francisco Javier Elizondo  Scott Wilson  Tarren J. Shaw  Matthew L. Jensen 《Journal of Science Education and Technology》2017,26(6):597-612

This study examined the role of formative and summative assessment in instructional video games on student learning and engagement. A 2 (formative feedback: present vs absent) × 2 (summative feedback: present vs absent) factorial design with an offset control (recorded lecture) was conducted to explore the impacts of assessment in video games. A total of 172 undergraduates were randomly assigned to one of four instructional video game conditions or the control. Results found that knowledge significantly increased from the pretest for players in all game conditions. Participants in summative assessment conditions learned more than players without summative assessment. In terms of engagement outcomes, formative assessment conditions did not significantly produce better learning engagement outcomes than conditions without formative assessment. However, summative assessment conditions were associated with higher temporal disassociation than non-summative conditions. Implications for future instructional video game development and testing are discussed in the paper.  相似文献