Learning in Agriculture: Rural Development Agents in France Caught between a Job Identity and a Professional Identity     

Christophe Albaladejo  Nathalie Couix  Laurence Barthe 《The Journal of Agricultural Education and Extension》2013,19(2):95-106

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EXTENDING THE CHAIN OF TRADITION: Reflections on the Goals of Adult Text Study   总被引：1，自引：1，他引：0  

Isa Aron  Diane Tickton Schuster 《Journal of Jewish Education》2013,79(1-2):44-56

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Needs of thermodynamic properties measurements and modeling in the frame of new regulations on refrigerants     

COQUELET Christophe RICHON Dominique 《浙江大学学报(A卷英文版)》2007,8(5):724-733

In 1987, the Montreal Protocol prohibited the worldwide use and production of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) and hydro fluorocarbons (HFCs) were proposed as alternative refrigerants. Unfortunately, HFCs have non negligible global warning potential and therefore new refrigerants must be proposed or old refrigerants must be used associated with HFC. Accurate experimental thermodynamic data and predictive techniques are required for better under-standing of the performance of the newly proposed refrigerants. In this communication, experimental techniques based on either analytic or synthetic methods are first described. Data are reported. Then two newly developed predictive models based on thermodynamic approach with the isofugacity criterion and artificial neural network method are presented. The results can provide better evaluation of refrigerants, especially with the aim of studying global warning effects.  相似文献   

A pilot study on quantification of training load: The use of HRV in training practice     

Damien Saboul  Pascal Balducci  Grégoire Millet  Vincent Pialoux  Christophe Hautier 《European Journal of Sport Science》2016,16(2):172-181

Recent laboratory studies have suggested that heart rate variability (HRV) may be an appropriate criterion for training load (TL) quantification. The aim of this study was to validate a novel HRV index that may be used to assess TL in field conditions. Eleven well-trained long-distance male runners performed four exercises of different duration and intensity. TL was evaluated using Foster and Banister methods. In addition, HRV measurements were performed 5 minutes before exercise and 5 and 30 minutes after exercise. We calculated HRV index (TL_HRV) based on the ratio between HRV decrease during exercise and HRV increase during recovery. HRV decrease during exercise was strongly correlated with exercise intensity (R = ?0.70; p < 0.01) but not with exercise duration or training volume. TL_HRV index was correlated with Foster (R = 0.61; p = 0.01) and Banister (R = 0.57; p = 0.01) methods. This study confirms that HRV changes during exercise and recovery phase are affected by both intensity and physiological impact of the exercise. Since the TL_HRV formula takes into account the disturbance and the return to homeostatic balance induced by exercise, this new method provides an objective and rational TL index. However, some simplification of the protocol measurement could be envisaged for field use.  相似文献   

The relationship between lower body stiffness and injury incidence in female netballers     

Elizabeth C. Pickering Rodriguez  Mark L. Watsford  Rob G. Bower  Aron J. Murphy 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(3):361-373

The aim of this study was to provide contemporary information on injury rates in an elite and sub-elite netball population and to explore the relationship between lower body stiffness and lower body injuries. One elite and two sub-elite teams of female netballers (n = 29) performed the vertical hop test to assess active lower body stiffness (K_vert) and myometry to assess quasi-static stiffness. Lower body injuries were monitored via self-reporting and liaison with physiotherapists. Twelve lower body non-contact injuries were sustained by 10 players, equating to 11.29 lower body injuries per 1,000 exposure hours. The most commonly injured sites were the calf (33%) and ankle (25%). No significant differences between K_vert of injured and non-injured players were reported, however, injured elite players recorded significantly higher season mean quasi-static stiffness in the soleus (p = 0.037) and Achilles (p = 0.004) than non-injured elite players. Elite and sub-elite netball players recorded a higher injury incidence than previous reports of injuries in recreational netballers. Within the constraints of the study, relatively high stiffness of the soleus and Achilles appears to be related to lower body non-contact injury incidence in female netballers, particularly at the elite level. These results provide a basis for development of injury prevention strategies.  相似文献   

Student adjustment to higher education: the role of alternative educational pathways in coping with the demands of student life     

Rebecca Shankland  Christophe Genolini  Lionel Riou França  Julien-Daniel Guelfi  Serban Ionescu 《Higher Education》2010,59(3):353-366

The present longitudinal study measured student adjustment to higher education, comparing 50 participants from alternative schools (Steiner, Montessori, New Schools) with 80 students from the traditional school system. We hypothesized that students from alternative schools adapt better, because of greater perceived social support, academic self-efficacy, and task-oriented coping styles. Measures were taken during the last school year (baseline characteristics), and at the beginning of the first and last terms of the first year in higher education. The quality of adjustment was assessed through academic results, and physical and psychological well-being. The following instruments were used: the State-Trait Anxiety Inventory by Spielberger (1983), the 13-items Depression Inventory by Beck et al. (1961), the Coping Inventory for Stressful Situations by Endler and Parker (1990), and semi-directed interviews. Results show that students from alternative schools adjust better to higher education: they report less anxiety and depression symptoms, and show greater life satisfaction and academic achievement.  相似文献   

Arm coordination and performance level in the 400-m front crawl     

Schnitzler C  Seifert L  Chollet D 《Research quarterly for exercise and sport》2011,82(1):1-8

The purpose of this study was to determine whether the Index of Coordination (IdC) and the propulsive phase durations can differentiate performance level during a maximal 400-m front crawl swim trial. Sixteen male swimmers constituted two groups based on performance level (G1: experts; G2: recreational). All participants swam the 400-m front crawl at maximal speed. Video analysis determined the stroke (swimming speed, stroke length, stroke rate) and coordination (IdC) parameters for every 50 m. Both stroke and coordination parameters discriminated performance level. The expert group had significantly higher values for speed and stroke length and lower values for the relative propulsive phase duration and IdC (p < .05). However there was no significant change in coordination parameters for either group throughout the trial. This suggests that, when associated with greater stroke length, catch-up coordination can be an efficient coordination mode that reflects optimal drag/propulsion adaptation. This finding provides new insight into swimmers' adaptations in a middle-distance event.  相似文献   

SHARED LEADERSHIP IN A CONGREGATIONAL CHANGE EFFORT     

Laura Samuels  Isa Aron 《Journal of Jewish Education》2013,79(1-2):25-41

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The influence of trained peer tutoring on tutors' motivation and performance in a French boxing setting     

Legrain P  D'Arripe-Longueville F  Gernigon C 《Journal of sports sciences》2003,21(7):539-550

The aim of this study was to examine the potential motivational and behavioural benefits of two peer tutoring programmes for tutors in a sport setting. Differences between the sexes were also explored. Thirty two college-age males and females, all novices on a French boxing task, were assigned to a 2 x 2 [sex x training type: physical practice associated with trained peer tutoring (TPT) vs physical practice associated with untrained peer tutoring (UPT)] factorial design. All participants were given six French boxing lessons of 2 h each. The TPT programme included structured methods to prepare the participants to fulfil their role of tutors, whereas the UPT programme did not. The results demonstrated that the TPT programme resulted in higher scores for coaching skills. Furthermore, interaction effects revealed that the TPT programme yielded better offensive outcomes for males and better defensive outcomes for females. Although the UPT participants expressed higher self-efficacy, no differences emerged for intrinsic motivation and causal attributions. Finally, male tutors displayed higher self-efficacy and offensive outcomes than female tutors. The results are discussed in the light of previous findings in the educational and sport psychology literature.  相似文献   

Situational indexes of achievement motivation, help-seeking, and performance: influences of the learning context and gender differences     

Gernigon C  d'Arripe-Longueville F  Debove V  Puvis A 《Research quarterly for exercise and sport》2003,74(4):473-479

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