Le trouble déficitaire de l'attention/hyperactivité (TDA/H) est une problématique qui touche un nombre important de jeunes Québécois. Un lien entre le TDA/H, plus particulièrement la composante inattention, et l’apparition de difficultés scolaires a été démontré à maintes reprises. Quelques études suggèrent que la pratique d'activités sportives pourrait influencer le lien entre l'inattention et les difficultés scolaires et augmenter ainsi la probabilité de perséverer dans les études et, conséquemment, d’obtenir un diplôme scolaire. La présente étude vise à examiner le lien entre l’inattention durant l’enfance et l’obtention du diplôme d’études secondaires, puis à vérifier si la pratique d'activités sportives durant l’adolescence influence ce lien. À cette fin, 1043 jeunes ont été suivis de 6 à 23 ans. Une analyse de régression logistique binaire de type hiérarchique a été utilisée pour tester les hypothèses proposées. D’une part, et tel que prévu, une forte association négative entre l’inattention et la diplomation est observée. Cette association demeure satistiquement significative après contrôle de différentes variables (hyperactivité, symptômes intériorisés, Q.I. et l’adversité familiale). La relation inattention-diplomation n’est toutefois pas modérée par la pratique d’activités sportives. Cette étude souligne l’importance de mettre en place des mesures efficaces pour permettre aux jeunes souffrant d’inattention d’avoir de meilleures chances de diplômer. / Attention deficit/hyperactivity disorder (ADHD) is a mental health issue that many youths have to deal with. It is of great concern as many authors report a link between ADHD and academic problems. It has been shown that inattention levels contribute more to academic problems than hyperactivity levels per se. On the other hand, the results of few studies suggest that sport activities could influence the link between inattention and academic problems. The aims of this study was to investigate the link between inattention at the end of childhood and high school graduation and to examine the hypothesis that sport activities during adolescence could moderate that relation. To this end, 1043 youths were followed from 6 to 23 years old, as part of the Montreal longitudinal and experimental stud. Binary logistic regression analysis was conduct to test the proposed hypotheses. The results indicate a strong association between inattention and high school graduation. This relation remained statistically significant after controlling for associated problems (hyperactivity, internalized symptoms), I.Q., and familial adversity. The relation inattention-high school graduation was not moderated by sport activities, however. This study emphasizes the importance of implementing measures that could help youths with inattention problems achieving academic success.

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

La majorité des adolescents québécois auront consommé une substance psychoactive avant la fin de leurs études secondaires. Parmi les facteurs ayant une influence sur cette consommation, on retrouve les normes sociales, dont les normes descriptives. Ce mémoire vise à évaluer l’impact des normes descriptives du milieu scolaire sur les comportements d’usage de cannabis chez les adolescents québécois, ainsi que sur les méfaits attribués à cette consommation. Cette étude examine les liens entre l’écart de perception de prévalence de consommation de cannabis au sein d’une école et la consommation ainsi que les conséquences attribuées à cet usage par les élèves. De plus, elle examine le rôle modérateur des écarts de perception de la prévalence de consommation sur la progression de la consommation, ainsi que sur le lien entre la consommation de cannabis en secondaire 4 et des conséquences attribuées à cette consommation un an plus tard. Provenant de la Stratégie d’Intervention Agir Autrement, l’échantillon de cette étude est constitué de 1601 élèves suivis de secondaire 2 à secondaire 5. Des analyses de régression logistique multinomiale ont été conduites et ont montré que plus les élèves surestiment la prévalence de consommation de cannabis au sein de leur école, plus ils ont de chance de consommer du cannabis et d’attribuer des conséquences négatives à leur consommation un an plus tard. Les résultats ont également montré un effet modérateur positif de l’écart de perception de la prévalence sur la progression de la consommation de cannabis de secondaire 4 à 5, spécifiquement chez les élèves ayant une faible consommation en secondaire 4. Finalement, les résultats ont montré un deuxième effet modérateur de l’écart de perception de prévalence, celui-ci sur le lien entre la consommation de cannabis en secondaire 4 et l’attribution de conséquences négatives à cette consommation un an plus tard. Précisément, les élèves ayant une faible consommation et qui surestiment la prévalence de consommation de cannabis au sein de leur école auront plus de chance d’attribuer plusieurs méfaits à leur consommation en secondaire 5 que d’en attribuer aucun. Par contre, les élèves ayant une consommation de cannabis élevée en secondaire 4 ne rapportent pas plus ni moins de conséquences selon leur estimation de prévalence. Les implications de ces résultats sont discutées. / Substance use in adolescence is a relatively common behavior. By the end of high school, a majority of Quebec teenagers will have experimented with psychoactive drugs or alcohol. Among the multiple factors influencing substance use are the social norms, namely the descriptive norms. This study evaluates the impact of the misperception of descriptive norms within the school context on marijuana use and its related consequences. Specifically, this study examines the relationship between the misperception of prevalence of cannabis use within a high school and the actual use of marijuana and its attributed related consequences. It also examines the moderating role of misperception of cannabis use prevalence on the progression of marijuana usage, and on the relationship between cannabis use in 10th grade and its attributed consequences a year later. Using data from the New Approaches, New Solutions intervention strategy, 1601 high school students were followed from grade 8 through grade 11. Multinomial logistic regression analyses were conducted and have indicated that the more the students overestimate the prevalence of cannabis use, the more chances they have to use marijuana themselves and attribute negative consequences to their cannabis use a year later. Results have also shown a moderating effect of the misperception of prevalence of cannabis use on the progression of marijuana use from grade 10 to 11, particularly with the students using marijuana occasionally in grade 10. Results also indicate a moderating effect of the misperception of prevalence of school wide cannabis use on the relationship between marijuana use in grade 10 and attributed consequences a year later. Specifically, students using marijuana occasionally and who overestimate the prevalence of cannabis use by their school peers will have more chances of attributing more than three consequences to their drug use in grade 11 than to attribute no harm to it whereas students who use marijuana frequently in grade 10 do not attribute consequences in accordance with their estimation of the prevalence of cannabis use by their school peers. Clinical implications of these findings are discussed.

[Truncated abstract] Despite significant scientific advances in tracking the complex physiological mechanisms that drive the asthma disease process, worldwide trends in childhood asthma continue to rise. This research sought to describe the relationships between psychosocial stress, psychosocial resources, asthma severity, and health-related outcomes from the standpoints of biopsychosocial and developmental theory. The research consisted of three studies based on a prospective study involving 2573 children from a community-based birth cohort. The cohort has been under active follow-up from birth and this thesis draws on data obtained at the 1, 2, 6, 10 and 13 year follow-ups . . . The final study undertook to describe the mediating influence of specific supportive behaviours provided by family members and peers to adolescents with asthma. Ninety-nine adolescents participating in the 13 year follow-up of the community cohort study completed a semi-structured interview adapted from the Diabetes Social Support Interview (La Greca et al., 1995) to assess supportive behaviours and the KINDL (Ravens-Sieberer & Bullinger, 1998) to assess QOL. It was predicted that illness-specific support would mediate the relationship between family dysfunction and quality of life. Qualitative analyses identified parents as important sources of tangible support, peers as important sources of companionship and emotional support, and siblings bridging the two, by providing tangible, companionship and emotional support to the adolescent. Mediator analyses found that specific parent behaviours perceived as unsupportive by the adolescent mediated the relationship between family dysfunction and self-oriented quality of life. Clinical implications support the integration of medical and psychological expertise in the treatment of asthma. Future research directions are also discussed.

Eco-labeling is an important matter in the modern world, because of its relationship to the significant issues of the society, i.e. environmental and health care. More and more people pay great attention to the ‘green’ aspect of their lives. Many researchers, in their turn, unveil the topic devoted to the eco-labeling strategies in their academic papers.  However, there is a certain knowledge gap in the existing literature, which allowed the researchers of this paper to focus the study on consumers' preferences towards eco-labeled products and purchase intention in the context of cultural diversity. Cultural aspect might have the crucial effect and predetermine consumers’ behavior to some extent. Thus, for companies’ management it is highly important to be aware of cultural context of the country they are already operating in or only going to internationalize into. Prior to empirical data collection a literature review on eco-labeling, cultural diversity, and purchase intention were conducted, followed by the integration of gained information into the theoretical model. The theoretical model, developed by the authors, presents the research of the perceived association between consumers’ preferences, as presented by own health care and environmental care, and purchase intention under the impact of the moderating effect of national culture. In order to test the hypotheses formulated on the literature and model bases, primary data from respondents from three different countries (namely, the USA, Sweden, and Russia) and secondary data from existing literature were collected, the integration of which allowed getting some relevant conclusions and results. After the data collection and all the statistical process analyzing it, the researchers concluded that culture has an impact on the association of consumers' preferences and purchase intention of eco-labeled products, but this moderating effect varies in terms of the context of consumers' preferences and different cultural dimensions.

Background: Effective information exchange is an asset to effective lung cancer care. Although a considerable body of evidence informs the approaches to ‘diagnostic bad news delivery’, the exchange of information that takes place between patients with cancer and professionals with whom they interact thereafter is less well documented. Information exchange has an influential role throughout the lung cancer care continuum, providing patients and professionals with details relative to the cancer diagnosis and the subsequent choices to be made in its management. Information on disease extent, treatment and related side-effects, rehabilitation and prognosis are judged by patients as the most prominent for them. Despite awareness of the specific categories relevant to information exchange needs, there is little evidence available exploring the information exchange process, per se, within cancer generally and even less within the lung cancer context. Aim: To investigate information exchange processes during lung cancer consultations, specifically exploring information content which is both exchanged and not exchanged. Design: Qualitative, multiple case study design. Methods: A case centred on a patient with lung cancer. Within the case were the patients, the health professionals they consulted with and accompanying companions. Seven cases were recruited, which included 12 companions. Data were collected in outpatient clinics between 2010 and 2011. Data were digital recordings of consultations; debrief interviews immediately post-consultation and later in-depth patient interviews. All interviews were transcribed and analysed for pattern matching and coding. Findings: Analysis of categorical data indicated cases were typical of the Scottish lung cancer population across all demographic domains, accept age and performance status. The preliminary analysis showed across cases, almost universal satisfaction with the level and content of information exchange for the main a priori categories of diagnosis, treatment and treatment outcome. Substantive analysis revealed that information content across the a priori categories was influenced by the presence of the accompanying companion. Within the clinical consultation, companion influence on information exchange was shown to be mediating, moderating or neutral. A key finding which emerged showed companion accompaniment to be a negotiated process, with three identifying levels of accompaniment. Non-negotiated companion presence at the clinic was associated with influential and expert companions who significantly moderated the content, direction and flow of information exchange, using the constructs of companion control, companion agenda and companion as expert. Persuasive influences further shaped non-negotiated accompaniment and were identified as demographic characteristics and relationship alliances. Patient and professional perspective regarding companion accompaniment was shown to be discordant. Conclusions: The level of negotiated companion presence at lung cancer clinics has direct implications for clinical care. There needs to be greater understanding among professionals of ways in which information exchange can be influenced by companions.

During human walk, we balance internal muscle forces and external forces outside of the body, while trying to minimize physiological energetic expenditure and mechanical loading on the body. The biomechanics of walking can be affected by various factors, including body size. In individuals with greater body size, the ground reaction force increases, so it is expected that joint moment of the lower limb in individuals with greater body size should increases. However, this relationship is not always true - as documented by previous studies, larger individuals use moderating mechanisms in the form of postural adjustment of the lower limb which decreases the load on joints during walking. The aim of this diploma thesis is to investigate the effect of body size and posture on the biomechanics of walking in the stance phase of walking, and to verify the presence of moderating mechanisms. We obtained kinematic and kinetic data from nineteen probands. The data was collected during three types of walking - during normal walking, walking with extended knees and crouched walking. We used Visual3D software to calculate angles in joints and joints moments of the lower limb. The independent effect of body mass, lower limb length measured in Visual3D, lower limb length measured anthropometrically, biiliac...

De nombreuses études ont démontré l’effet modérateur de la qualité de la relation maître-élève sur le niveau d’adaptation comportementale et scolaire des élèves du primaire, mais très peu s’y sont intéressés chez les élèves du secondaire. Pourtant les rapports entre les enseignants et les élèves au secondaire sont bien différents de ce qu’ils sont au primaire. La présente étude vise donc à examiner le rôle de la qualité de la relation maître-élève sur le risque d’abandonner l’école auprès d’un échantillon de 4069 élèves québécois de deuxième secondaire. Nos deux premiers objectifs sont de vérifier si l’effet prédicteur des difficultés scolaires (retard, rendement et motivation scolaires) sur le décrochage scolaire varie en fonction des relations chaleureuses et conflictuelles. Le troisième objectif est de déterminer si l’effet modérateur de la qualité de la relation maître-élève varie selon le sexe de l’élève. Les résultats n’ont pas permis de démontrer tel que prévu un effet protecteur de la relation chaleureuse pour les élèves à risque de décrocher, mais ont plutôt mis en évidence un effet aggravant de la relation conflictuelle pour les élèves qui fonctionnent bien à l’école. Quant au sexe de l’élève, il ne fait pas varier l’effet modérateur de la qualité de la relation élèveenseignant. Ces résultats impliquent que pour prévenir le décrochage scolaire, il faut accorder une attention particulière aux conflits pouvant survenir entre un élève et son enseignant et ce, particulièrement chez les élèves qui fonctionnent bien en classe. / Several studies have demonstrated the moderating effect of the quality of teacherstudent relationship on the level of behavioral and academic adjustment in elementary students, but very few of them investigated this effect in adolescence, although teacher-student relationships present several differences in high school. The present study examines the role of the quality of teacher-student relationship on the risk of dropping out of school among a sample of 4069 Quebec students in 8th grade. The first two objectives were to test if the predictive link between academic difficulties (delay, achievement and school motivation) and school dropout varied according to the nature of the teacher-student relation (warm or conflictual). The third objective was to determine if the moderating effect of the quality of teacher-student relationship varied as a function of students' sex. The results did not demonstrate as expected a protective positive effect of a warm relationship for students at risk of dropping out of school. Rather, they highlighted the detrimental effect of conflictual relationships for students who do well at school. Students’ sex did not moderate the effect of the quality of student-teacher relationship on school dropout. These results imply that to prevent school dropout, it is necessary to pay particular attention to conflicts that may arise between a student and his teachers, especially among students who perform well in class.

La présente thèse dit ce qu’est le Président de la République Portugaise, elle le nomme. Pour ce faire, elle montre comment la figure présidentielle s’est construite depuis 1986, depuis que la démocratie portugaise n’est plus « à l’ombre des épées ». A cette fin, la thèse examine d’abord la légitimité particulière du Chef de l’Etat lusitain, directe mais apartisane. Celle-ci doit être comprise à la lumière de l’histoire politique et constitutionnelle du Portugal qui a connu le parlementarisme éclaté et la dictature personnelle. Elle examine ensuite la position du Président de la République au sein de l’architecture constitutionnelle portugaise au moyen de ses pouvoirs et de ses relations avec le Gouvernement en tant que fonction et en tant qu’organe. Si la présidence portugaise ne détermine pas la politique générale du pays, les différents titulaires de la charge présidentielle ont su participer à la formation de la volonté politique de l’Etat grâce au développement d’une magistrature qui leur est propre. Leurs prises de parole et leurs actions de terrain ont permis au Président de la République d’avoir une réalité par-delà le dispositif constitutionnel. De ces différents éléments, la thèse infère enfin la qualification du régime politique portugais et se clôt sur la dénomination de la figure présidentielle portugaise, telle qu’elle a été et s’est construite. / This doctoral dissertation tells what the President of the Portuguese Republic is and gives it a name. To this end, it shows how the Portuguese presidential figure has built itself since 1986, since the Portuguese democracy has no more been under the “shadow of swords”. To reach this goal, the dissertation begins by focusing on the president’s legitimacy, direct but unpartisan. Its particular legitimacy cannot be understood without referring to Portugal’s political and constitutional history which went through fragmented parliamentarism and personal dictatorship. Then it considers the presidential position within the Portuguese constitutional framework using its powers and looking into its relations with the Government as a function and as an organ. If the Portuguese presidency does not fix the country general policy, it does take part in the State’s will formation due to the emergence of a proper magistracy. Speech and field acts have given a reality to the President beyond the constitutional purview. Finally, this doctoral dissertation infers the qualification of the Portuguese political regime and ends by naming the Portuguese presidential figure, as it has been built and as it has been built itself.

De nombreuses études ont démontré l’effet modérateur de la qualité de la relation maître-élève sur le niveau d’adaptation comportementale et scolaire des élèves du primaire, mais très peu s’y sont intéressés chez les élèves du secondaire. Pourtant les rapports entre les enseignants et les élèves au secondaire sont bien différents de ce qu’ils sont au primaire. La présente étude vise donc à examiner le rôle de la qualité de la relation maître-élève sur le risque d’abandonner l’école auprès d’un échantillon de 4069 élèves québécois de deuxième secondaire. Nos deux premiers objectifs sont de vérifier si l’effet prédicteur des difficultés scolaires (retard, rendement et motivation scolaires) sur le décrochage scolaire varie en fonction des relations chaleureuses et conflictuelles. Le troisième objectif est de déterminer si l’effet modérateur de la qualité de la relation maître-élève varie selon le sexe de l’élève. Les résultats n’ont pas permis de démontrer tel que prévu un effet protecteur de la relation chaleureuse pour les élèves à risque de décrocher, mais ont plutôt mis en évidence un effet aggravant de la relation conflictuelle pour les élèves qui fonctionnent bien à l’école. Quant au sexe de l’élève, il ne fait pas varier l’effet modérateur de la qualité de la relation élèveenseignant. Ces résultats impliquent que pour prévenir le décrochage scolaire, il faut accorder une attention particulière aux conflits pouvant survenir entre un élève et son enseignant et ce, particulièrement chez les élèves qui fonctionnent bien en classe. / Several studies have demonstrated the moderating effect of the quality of teacherstudent relationship on the level of behavioral and academic adjustment in elementary students, but very few of them investigated this effect in adolescence, although teacher-student relationships present several differences in high school. The present study examines the role of the quality of teacher-student relationship on the risk of dropping out of school among a sample of 4069 Quebec students in 8th grade. The first two objectives were to test if the predictive link between academic difficulties (delay, achievement and school motivation) and school dropout varied according to the nature of the teacher-student relation (warm or conflictual). The third objective was to determine if the moderating effect of the quality of teacher-student relationship varied as a function of students' sex. The results did not demonstrate as expected a protective positive effect of a warm relationship for students at risk of dropping out of school. Rather, they highlighted the detrimental effect of conflictual relationships for students who do well at school. Students’ sex did not moderate the effect of the quality of student-teacher relationship on school dropout. These results imply that to prevent school dropout, it is necessary to pay particular attention to conflicts that may arise between a student and his teachers, especially among students who perform well in class.