30 min of treadmill walking at self-selected speed does not increase gait variability in independent elderly     

Emmanuel S. Da Rocha  Marcos R. Kunzler  Maarten F. Bobbert  Jacques Duysens 《Journal of sports sciences》2018,36(11):1305-1311

Walking is one of the preferred exercises among elderly, but could a prolonged walking increase gait variability, a risk factor for a fall in the elderly? Here we determine whether 30 min of treadmill walking increases coefficient of variation of gait in elderly. Because gait responses to exercise depend on fitness level, we included 15 sedentary and 15 active elderly. Sedentary participants preferred a lower gait speed and made smaller steps than the actives. Step length coefficient of variation decreased ~16.9% by the end of the exercise in both the groups. Stride length coefficient of variation decreased ~9% after 10 minutes of walking, and sedentary elderly showed a slightly larger step width coefficient of variation (~2%) at 10 min than active elderly. Active elderly showed higher walk ratio (step length/cadence) than sedentary in all times of walking, but the times did not differ in both the groups. In conclusion, treadmill gait kinematics differ between sedentary and active elderly, but changes over time are similar in sedentary and active elderly. As a practical implication, 30 min of walking might be a good strategy of exercise for elderly, independently of the fitness level, because it did not increase variability in step and stride kinematics, which is considered a risk of fall in this population.  相似文献   

Autoionization in atomic and molecular physics     

Jacques E. Collin Ph.D.  Agr.Ens.Sup. 《Endeavour》1977,1(3-4)

The important role of ionized atoms and molecules in many aspects of physical and chemical phenomena is being increasingly recognized. Typical research areas are astrophysics and interstellar molecular syntheses; plasma physics and fusion research; aeronomy and effects of ultraviolet irradiation on high atmosphere constituents; ion-molecule reactions; mass spectrometry; fundamental research on structural problems; behaviour of excited species; quantum theory of molecular structure and chemical kinetics. This paper emphasises the role of the autoionization process and discusses some of its characteristics, as well as the experimental methods used for its study.  相似文献   

Albrecht Dürer at the crossroads of art and science     

Meyer J 《Endeavour》2004,28(1):2

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Some recent Unesco publications     

Jacques vauclair  Jo?o Batista Araujo Oviveira  Guy Neave  Abdel Aziz Koussy 《Prospects》1976,6(2):306-309

Notes and Reviews

Some recent Unesco publications  相似文献   

Participation in international teleconferences and discussions: Implicit assumptions     

Elizabeth Anderson  Jacques du Plessis  Tom Nickel 《Educational technology research and development : ETR & D》2001,49(3):118-123

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Academic self-concept and academic interest measurement: A multi-sample European study     

Marc Corbière  Franco Fraccaroli  Valenti Mbekou  Jacques Perron 《European Journal of Psychology of Education - EJPE》2006,21(1):3-15

Academic self-concept and academic interest are crucial concepts for understanding students’ academic achievement. Yet, few questionnaires currently exist that have been used and validated in more than one country. This study aimed at assessing these concepts using an academic self-concept questionnaire (Marsh, 1990) and an academic interest questionnaire (Corbière & Mbekou, 1997) with French and Italian student samples. Confirmatory Factor Analyses enabled us to assess the structure of the two questionnaires with regard to two academic subjects — Math and First Language (French or Italian) — and to determine the theoretical directions between the concepts. Results from Confirmatory Factor Analyses of both French and Italian samples supported a theoretical model in which academic self-concept and academic interest were intercorrelated, yet maintaining their unique characteristics. On the other hand, results from Multi-Sample Confirmatory Factor Analyses (French and Italian samples) endorsed a correlational model between the two concepts. Finally, the results indicated a significant and positive correlation between academic self-concept, academic interest, and academic achievement in both academic subjects.  相似文献   

Work values in relation to gender and forecasted career patterns for women     

Jacques Perron  Louise St-Onge 《International journal for the advancement of counseling》1991,14(2):79-90

This study examined the problem of life-style and career patterns for women. College students (367 males, 332 females) expressed their preferences for one of three career patterns for women combining work and family involvement and also answered a work values questionnaire. Results showed that 70.5% of the subjects expected women to attend school and/or work outside the home first and to have their child(ren) only after they have established themselves in a career. Forecasting of career patterns for women was significantly related to subjects' work values. Results confirmed previous findings and also indicated new trends in work values that differentiate between male and female college students.Université de MontréalUniversité du Québec à Trois-Rivières  相似文献   

Guest editor's note     

J. Nicholls Eastmond  Jacques du Plessis 《Educational technology research and development : ETR & D》2001,49(3):106-107

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Guidelines for Establishing Undergraduate Bioinformatics Courses     

Cohen  Jacques 《Journal of Science Education and Technology》2003,12(4):449-456

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Toward a set of measures of student learning outcomes in higher education: evidence from Brazil     

Tatiana Melguizo  Jacques Wainer 《Higher Education》2016,72(3):381-401

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