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L'usage de cannabis et l'insécurité routière : étude par questionnaires et observations sur simulateur de conduiteRicher, Isabelle January 2009 (has links)
Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal
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L’évaluation du risque comme facteur influençant les opinions et comportements en lien avec le tabac et le cannabisPlante, Elisabeth 07 1900 (has links)
S’inscrivant dans le cadre d’une étude pancanadienne portant sur la normalisation du cannabis et la stigmatisation du tabac, le principal objectif de cette recherche était de comprendre quelle place occupe l’évaluation des risques dans la compréhension des perceptions et comportements liés aux deux substances. Pour ce faire, à partir d’un devis mixte – quantitatif et qualitatif, nous avons 1) décrit les perceptions et opinions des participants quant à leur propre consommation de cannabis et/ou de tabac et quant à la consommation que font les gens en général des mêmes substances. Nous avons aussi 2) décrit comment les participants évaluent les risques liés à chacune des substances. Enfin, sachant que la perception du risque est intimement liée au comportement d’un individu, nous avons cherché 3) à préciser comment l’évaluation du risque agit sur les comportements et les opinions des quelques 50 participants, hommes et femmes âgés entre 20 et 49 ans, bien intégrés socialement, envers le tabac et le cannabis.
Il s’avère que les fumeurs de cannabis, qui ont insisté sur la distinction à faire entre la manière dont ils font usage de la substance et une consommation abusive, valorisait le contrôle que leur permettait, selon eux, la consommation de cannabis. La consommation de cigarettes, quant à elle, était perçue négativement pour des raisons opposées puisque de l’avis des participants à l’étude, elle engendrerait chez le fumeur une incapacité à se maîtriser et un besoin compulsif de fumer. Dans cette optique, les risques liés au cannabis étaient perçus, par la plupart, comme étant contrôlables, à l’exception du jugement d’autrui qui demeurerait incertain et sur lequel il serait impossible d’avoir du contrôle. La réaction de certaines personnes de leur entourage étant ou bien imprévisible ou négative, c’est ce qui les amènerait à fumer principalement en privé. Le contrôle social formel aurait finalement peu d’influence étant donné le fort sentiment qu’ont les répondants qu’il ne s’appliquera tout simplement pas à eux. / In the context of a pan-Canadian study pertaining to the normalization of cannabis and the stigmatization regarding tobacco, the main objective of this research was to understand the importance given in the evaluation of the risks in the understanding of the perceptions and behaviors as they relate to the aforementioned substances. Based on a mixed method, qualitative and quantitative, the process undertaken was 1) to describe the perceptions and opinions of respondents regarding their own use of cannabis and/or tobacco as well as the use of the same substances by the general public. We then 2) described how the respondents evaluate the risks as they relate to each substance. Finally, knowing that the perception of the risks are intimately related to the behavior of an individual, we 3) sought to determine how the evaluation of risks affects the behaviors and opinions of the 50 study participants, all of whom are socially well adjusted men and women between the ages of 20 to 49, regarding tobacco and cannabis.
The cannabis smokers insisted on the importance of making a distinction between the way they use the substance versus an abusive use. They ascertained that there was a degree of control regarding the use of cannabis. The use of tobacco was perceived negatively for opposite reasons as it created a dependency to the smoker, an incapacity to control its use and the creation of a compulsive urge to smoke. Given these optics, the risks related to use of cannabis were perceived by most as controllable with the exception of judgment from others which remained uncertain and which would be impossible to control. The reaction of certain people within their surroundings was either unpredictable or negative which lead them to smoke mainly in private. Finally, formal social control would very little influence on the respondents given the strong feeling they had that this did not apply to them.
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Le rôle modérateur de la pratique d’un sport organisé dans la relation entre les amis déviants et l’intoxication à l’alcool et la consommation de cannabis à l’adolescencePoirier-Payette, Valérie 05 1900 (has links)
La consommation de substances psychoactives débute généralement à l’adolescence. Cette pratique, bien qu’illégale, est répandue à cet âge. Toutefois, elle peut avoir de graves répercussions sur le développement de l’individu. Il est important de mieux connaître les facteurs pouvant influencer sa fréquence d’utilisation afin d’en diminuer les risques. Ce mémoire vise à examiner le rôle des amis déviants et de la pratique d’un sport organisé dans le développement de l’intoxication à l’alcool et la consommation de cannabis à l’adolescence. Plus précisément, l’étude vise à déterminer si la pratique d’un sport organisé a des effets modérateurs sur la relation entre les amis déviants et l’intoxication à l’alcool et la consommation de cannabis. Les analyses ont été réalisées séparément pour l’alcool et le cannabis. L’échantillon utilisé provient de l’étude longitudinale de la Stratégie d’Intervention Agir Autrement et comprend 4219 adolescents. Des régressions probit ont été effectuées. Tel qu’attendu, les résultats montrent que la fréquentation d’amis déviants est associée au risque d’intoxication à l’alcool et de consommation de cannabis. De plus, les résultats ont démontré le rôle modérateur protecteur de la pratique d’un sport organisé pour l’alcool. Un jeune qui a des amis déviants et qui participe à un sport organisé consommerait généralement moins d’alcool qu’un jeune qui a des amis déviants et qui ne participe pas une activité sportive organisée. Les implications de ces résultats pour la recherche sont discutées. / Substance use generally emerges during adolescence and, even if prohibited, is widespread at that age. However, it can have severe consequences on human development. It is important to better understand the factors that influence the frequency of drug use in order to reduce risk. This research project aims to examine the role of deviant friends and organized sport practice in the development of alcohol abuse and cannabis use in adolescence. More specifically, this study aims to determine whether an organised sport practice held a moderating effect on the relationship between deviant friends and alcohol abuse and cannabis use. Analyzes were performed separately for alcohol and cannabis. The sample is drawn from the longitudinal study of New Approach, New Solutions and includes 4219 adolescents. Probit regressions were performed and showed, as expected, that deviant friends are associated with alcohol abuse and cannabis use. In addition, the results support the protective moderating role of organized sport practice for alcohol. Youth who has deviant friends and participate in organized sport generally consume less alcohol that youth who has deviant friends and is not involved in organized sport activity. The implications of these findings are discussed.
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Les beuveries et la consommation de cannabis au secondaire et le décrochage scolaire à la fin du secondaire : effets modérateurs protecteurs du climat relationnelLangevin, Jean-Philippe 05 1900 (has links)
No description available.
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Fatores preditivos de Aderência no tratamento de usuários de maconha / Predictive factors of treatment adherence in cannabis usersVilela, Fabiana Andrioni de Biaze [UNIFESP] 24 November 2011 (has links) (PDF)
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Publico-12675.pdf: 644045 bytes, checksum: 4760c174c211a52ff1a44e954522d1af (MD5) / A aderência ao tratamento para dependência química é questão preocupante e requer atenção especial dos profissionais que atuam com esta população. OBJETIVO: identificar características dos pacientes usuários de maconha que possam ser consideradas fatores preditivos de abandono do tratamento. METODOLOGIA: foi realizada a análise secundária dos dados de um Ensaio Clínico Randomizado em que foram incluídos 169 dependentes de maconha avaliados no ingresso e reavaliados três vezes nos seguimentos realizados após o tratamento breve ao qual foram submetidos. Os pacientes foram randomizados em três grupos de tratamento: no Grupo 1, os pacientes foram submetidos a quatro sessões de tratamento em um mês, no Grupo 2, as mesmas quatro sessões em três meses e no Grupo 3 ficaram os pacientes em espera, os quais, posteriormente foram randomizados para um dos dois grupos de tratamento. RESULTADOS: Os pacientes alocados no grupo três, ou seja, de espera, apresentaram 3.47 vezes mais chance de abandono do que aqueles inseridos nos outros grupos. Baseado nos dados sócio demográficos, concluiu-se que para cada ano de idade do paciente, as chances de abandono poderiam ser multiplicadas por 0,91, representando riscos mais baixos. Para cada ano de consumo da maconha, as chances também seriam multiplicadas por 0,92 representando menores riscos. CONCLUSÃO: Diante dos dados obtidos, pode-se inferir que quanto mais velho e quanto mais anos de consumo de maconha o sujeito tem, menores são suas chances de desistência do tratamento. Desta forma, pode-se apontar a importância de intervenções específicas para os grupos com riscos mais altos de abandono do tratamento foi discutida bem como a relevância de outros estudos envolvendo usuários de maconha e indicações para os profissionais ajudarem os pacientes a aderirem ao programa proposto. / The present study involved secondary analysis of data from a Randomized Clinical Trial including 169 cannabis-dependents not only dependents assessed at baseline and submitted to brief treatment. Patients were first randomized into three treatment groups. OBJECTIVES: The objective was to identify characteristics which could be considered predictors of treatment dropout. RESULTS: Patients initially allocated into the control group presented a 3.47 greater chance of drop out than those of the treatment groups. Based on the socio-demographic data, it was concluded that for every year of patient age, the chances of drop out would be multiplied by 0.91, representing lower risk. For every year of cannabis use, chances of drop out would be multiplied by 0.92, again representing reduced risk. CONCLUSIONS: The importance of specific interventions for groups with a higher risk of treatment drop out was discussed, along with the relevance of other studies involving cannabis users and possible guidelines for professionals help patient to adhere. / TEDE / BV UNIFESP: Teses e dissertações
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Revisão sistemática da literatura de estudos clínicos e experimentais sobre os efeitos antitumorais dos canabinóides / Systematic review of the literature of clinical and experimental studies on the antitumoral effects of cannabinoidsRocha, Francisco Carlos Machado [UNIFESP] 28 April 2010 (has links) (PDF)
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Previous issue date: 2010-04-28 / Objetivo: Avaliar, através de uma revisão sistemática da literatura, os efeitos antitumorais dos canabinóides em qualquer tipo de neoplasia, utilizando como amostra seres humanos e animais de laboratório com tumores, bem como culturas de células tumorais. Método: A pesquisa incluiu as seguintes bases eletrônicas de dados: PUBMED, EMBASE, LILACS e “The Cochrane Collaboration Controlled Trials Register”. Todos os estudos publicados que envolveram os efeitos antitumorais (mecanismos celulares e moleculares) dos canabinóides foram considerados para esta revisão. Desta forma, foram levados em conta não somente ensaios clínicos (randomizados ou não) como também estudos experimentais in vivo e in vitro. A estratégia de busca bibliográfica compreendeu todas as publicações de cada base de dados até 31 de dezembro de 2009. O exame minucioso de todas as referências bibliográficas dos artigos importantes para esta revisão (incluindo artigos de revisão) foi igualmente realizado com o objetivo de selecionar artigos que não tivessem sido capturados pela estratégia de busca eletrônica. Resultados: De 3.920 artigos inicialmente identificados, 117 preencheram os critérios de inclusão para esta revisão. Todos os estudos incluídos nesta revisão sistemática foram experimentais (in vivo e/ou in vitro), excetuando-se um estudo clinico piloto fase I/II em humanos. Em todos os estudos experimentais incluídos, os canabinóides exerceram atividade antitumoral in vitro e/ou evidência antitumoral in vivo em vários modelos de células tumorais e tumores, respectivamente. As atividades antitumorais incluíram: efeitos antiproliferativos (sequestro do ciclo celular), diminuição da viabilidade e morte celular por toxicidade, apoptose, necrose, autofagia, efeitos antiangiogênicos e antimigratórios. As evidências antitumorais incluíram: diminuição do tamanho tumoral, efeitos antiangiogênicos e antimetastáticos. Adicionalmente, a maioria dos estudos descreveu que os canabinóides apresentaram seletividade na ação antitumoral em vários modelos tumorais. Desta forma, as células normais usadas como controle não foram atingidas. O fator segurança na administração dos canabinóides também foi demonstrado in vivo, em ratos com tumores marcados com células tumorais. O único estudo realizado em humanos, por sua vez, demonstrou segurança na administração intratumoral do delta-9-THC em pacientes com glioblastoma multiforme recorrente. Conclusões: Os vários canabinóides testados em múltiplos modelos de tumores apresentaram efeitos antitumorais in vitro e in vivo. Estes achados indicam que os canabinóides são compostos promissores para o tratamento das neoplasias. No entanto, pesquisas em seres humanos através de ensaios clínicos randomizados, metodologicamente bem conduzidos, devem ser realizadas para a avaliação de eficácia dos mesmos antes que eles possam ser indicados para esta finalidade. Este é o caso do delta- 9-THC e do canabidiol, que já foram testados e aprovados para uso em humanos em outras condições clínicas. Outros canabinóides, no entanto, necessitam ainda de pesquisas farmacocinéticas, farmacodinâmicas e toxicológicas antes de poderem ser testados em seres humanos. / Objective: To evaluate, through a systematic review of the literature, the antitumoral effects of cannabinoids on any type of cancer, involving both human beings and animal samples, as well as cultured tumor cells. Method: Research included the following electronic databases: PUBMED, EMBASE, LILACS and "The Cochrane Collaboration Controlled Trials Register. All published studies involving the antitumoral effects (cellular and molecular mechanisms) of cannabinoids were considered for this review. Thus, not only clinical trials (randomized or not) but experimental studies (both in vivo and in vitro) were taken into account. The bibliography search strategy included all publications of each of these databases until December 31, 2009. The scrutiny of all the references from the relevant articles for this review (which included review articles) was also performed, in order to select items that could not have been captured by the chosen electronic search strategy. Results: From 3,920 initially identified articles, 117 fulfilled the inclusion criteria for this review. All the studies included in this systematic review were experimental (in vivo and/or in vitro), except for a pilot clinical trial phase I/II involving humans. In all experimental studies included, cannabinoids exerted antitumoral activity in vitro and/or antitumoral evidence in vivo in several models of tumor cells and tumors, respectively. The antitumor activity included: antiproliferative effects (cell cycle arrest), decreased viability and cell death by toxicity, apoptosis, necrosis, autophagy, as well as antiangiogenic and antimigratory effects. Antitumoral evidence included: reduction in tumor size, antiangiogenic, and antimetastatic effects. Additionally, most of the studies described that the canabinnoids exercised selective antitumoral action in several distinct tumor models. Furthermore, normal cells used as controls were not affected. The safety factor in the cannabinoids’ administration has also been demonstrated in vivo in rats with tumors which were marked with tumor cells. The sole study in humans demonstrated safety in intratumoral administration of delta-9- THC in patients with recurrent glioblastoma multiforme. Conclusions: The various cannabinoids tested in multiple tumor models showed antitumoral effects both in vitro and in vivo. These findings indicate that cannabinoids are promising compounds for the treatment of cancer. However, methodologically well conducted research on humans through clinical trials has yet to be performed in order to evaluate their effectiveness. This is the case of delta-9-THC and cannabidiol, which have been tested and approved for use in humans in other clinical conditions. In the case of other cannabinoids, however, further pharmacokinetic as well as pharmacodynamic and toxicological studies are required before their being tested in humans. / TEDE / BV UNIFESP: Teses e dissertações
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CONDIÇÃO AUDITIVA DE FREQUENTADORES DE GRUPOS DE APOIO A EXUSUÁRIOS DE DROGAS / HEARING CONDITION OF GOERS OF SUPPORT GROUPS FOR FORMER DRUG USERSWeich, Tainara Milbradt 05 March 2012 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This research aims to verify the hearing condition of goers of support groups for
former drug users. It was evaluated 17 individuals, all former drug users, being
marijuana, crack and cocaine the most used drugs. The individuals were divided into
two groups according to the kind of the most commonly used drug: Group 1 (G1) -
10 former users of marijuana, Group 2 (G2) - Seven former users of crack/cocaine.
For the results analysis, they were also subdivided according to the time of drug use:
one to five years, six to 10 years and more than 15 years. The subjects were
submitted to anamnesis, pure tone audiometry (PTA), acoustic impedance
measurements, transient evoked otoacoustic emissions (TEOAE), suppressive effect
of TEOAE and brainstem evoked response audiometry (BERA). By comparing the
results of PTA of the G1 and G2 with one to five years of drug use, G2 presented
pure tone levels greater than 25 dB with a significant statistically difference in the
pure tone levels for the frequencies of 250, 500, 6000 and 8000 Hz in the right ear. In
the group of six to 10 years of drug use it was not found significant difference in pure
tone levels for frequencies of 4000 and 8000 Hz in the left ear, with worse pure tone
levels for the G2. For the group with more than 15 years of drug use, it was observed
pure tone levels above 25 dB for the frequencies from 3000 to 8000 Hz in the right
ear. In evaluations with TEOAE, TEOAE suppression effect and BERA, it was not
observed a difference in the results when they were compared according to the time
of drug use. G1 presented an average in the relation signal/noise of TEOAE greater
than the average in the G2, but without a significant statistically difference. The two
groups did not differ in the occurrence of suppressor effect of TEOAE and absolute
latency and inter-peak interval of BERA. It is emphasized that only five individuals
had adequate results for the age group in the BERA. As the time of drug use
increases, more changes were observed in the G1 results in PTA and BERA, but it
did not interfere in the results of the evaluations of the G2. The results suggest that
the use of drugs can cause peripheral and central hearing loss, and that the use of
crack/cocaine is more deleterious to the hearing that the use of marijuana. / O presente trabalho tem como objetivo verificar a condição auditiva de
frequentadores de grupos de apoio a ex-usuários de drogas. Foram avaliados 17
indivíduos ex-usuários de drogas, estando entre as mais usadas a maconha, o crack
e a cocaína. Os indivíduos foram divididos em dois grupos, conforme o tipo de droga
mais consumida: Grupo 1 (G1) 10 ex-usuários de maconha; Grupo 2 (G2) sete
ex-usuários de crack/cocaína. Para a análise dos resultados, houve uma subdivisão
conforme o tempo de uso de drogas: um a cinco anos, seis a 10 anos e mais do que
15 anos. Os indivíduos foram submetidos à anamnese, audiometria tonal liminar
(ATL), medidas de imitância acústica, emissões otoacústicas transientes (EOAT),
efeito supressor das EOAT e potenciais evocados auditivos de tronco encefálico
(PEATE). Ao comparar os resultados da ATL do G1 e G2 com um a cinco anos de
uso de drogas, o G2 apresentou limiares tonais maiores que 25 dBNA com diferença
estatisticamente significante nos limiares tonais para as frequências de 250, 500,
6000 e 8000 Hz na orelha direita. No grupo de seis a 10 anos de uso de drogas
houve diferença estatisticamente significante nos limiares tonais para as frequências
de 4000 e 8000 Hz da orelha esquerda, com limiares piores para o G2. Para o grupo
com mais de 15 anos de uso de drogas, observou-se limiares tonais acima de 25
dBNA para as frequências de 3000 a 8000 Hz na orelha direita. Nas avaliações com
EOAT, efeito supressor das EOAT e PEATE não se observou diferença nos
resultados quando foram comparados conforme o tempo de uso de drogas. O G1
apresentou média da relação sinal/ruído das EOAT superior ao G2, porém sem
diferença estatisticamente significante. Os dois grupos não diferiram quanto à
ocorrência do efeito supressor das EOAT, bem como quanto às latências absolutas
e aos intervalos interpicos do PEATE. Ressalta-se que apenas cinco indivíduos
apresentaram resultados adequados para a faixa etária no PEATE. O tempo de uso
da droga exerceu influência nos resultados do G1 na ATL e PEATE; observou-se
que quanto maior o tempo, maiores as alterações. Porém, o tempo de uso não
interferiu nos resultados das avaliações do G2. Os resultados encontrados sugerem
que o uso de drogas pode provocar alterações auditivas periféricas e centrais, e que
o uso de crack/cocaína é mais deletério para a audição que o uso de maconha.
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FIBRA DI CANAPA PER APPLICAZIONI DI ALTA QUALITA' / HEMP FIBRE FOR HIGH-QUALITY APPLICATIONS / HEMP FIBRE FOR HIGH-QUALITY APPLICATIONSMUSIO, SALVATORE 27 March 2018 (has links)
La fibra di canapa europea è l'unica fibra naturale con una certificazione di sostenibilità. La qualità della fibra è influenzata principalmente da genotipo, tecniche agronomiche, epoca di raccolta e metodo di macerazione. L'obiettivo principale della tesi è delineare le pratiche agronomiche e di post-raccolta per migliorare l'estrazione e la qualità della fibra, con particolare attenzione alla produzione di canapa multiuso ritardando la raccolta fino alla maturazione dei semi. Le prove di densità, fertilizzazione azotata e varietali sono state condotte in differenti ambienti Europei. La procedura di decorticazione standardizzata è stata confrontata con la linea longitudinale di estrazione della fibra per applicazioni di alto valore aggiunto. I test su bio-compositi di canapa sono stati effettuati con fibra pettinata per confrontarne le proprietà tra genotipi, epoca di raccolta e metodi di macerazione. I risultati di questa indagine suggeriscono che i) la densità di semina e la concimazione azotata ottimale sono tra 90-150 piante m-2 e 30-60 kg N ha-1; ii) le nuove varietà dallo stelo giallo presentano un'alta efficienza di decorticazione e una ridotta contaminazione da canapulo nella fibra, iii) la fibra di canapa, con proprietà comparabili a quelle del lino, si è dimostrata adatta per applicazioni in compositi di alto valore. / European hemp fibres are the only natural fibre with an established sustainability certification. Hemp fibre quality is affected by genotype, agronomic techniques, harvest time and retting method. The main objective of this thesis is to outline the agronomic and post-harvest practices for improved fibre extraction and fibre quality, with special attention to multipurpose hemp production delaying the harvest from the flowering stage until seed ripening is complete. Planting density and nitrogen fertilization trials and variety trials were conducted in contrasting environments in Europe. Stems were decorticated following a standardised procedure and longitudinal hemp line for textile and high-added values application was compared with lab-scaled decortication. Impregnated fibre bundle tests were carried out with hemp hackled fibre bundles to compare composites and back-calculated fibre properties between genotypes, harvest times and retting methods. Results of this investigation suggest that i) optimum plant density and nitrogen fertilization are between 90 and 150 plants m-2 and 30 and 60 Kg N ha-1 respectively; ii) new yellow stemmed varieties are characterized by high decortication efficiency and relative high cleanness of the extracted fibre and iii) long hemp fibre, having properties comparable to those of flax, proved to be suitable for high-tech composites applications.
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Physiopathologie de l’infarctus cérébral du sujet jeune : rôle de la résine de cannabis dans l’atteinte vasculaire et l’altération mitochondriale cérébrales / Pathophysiology of ischemic stroke in young adults : the role of the resin of cannabis in the cerebrovascular involvement and the brain mitochondrial dysfunctionWolff, Valérie 04 September 2014 (has links)
Nous avons montré : a) qu’il existe un lien entre la consommation de cannabis et la présence de sténoses artérielles intracrâniennes multifocales chez le jeune adulte victime d’infarctus cérébral, b) que la prévalence des sténoses artérielles intracrâniennes atteint un tiers des cas dans une cohorte de 159 infarctus cérébraux du jeune adulte, c) que 13% des infarctus cérébraux dans cette série répondent aux critères angiographiques du syndrome de vasoconstriction cérébrale réversible déclenché majoritairement par la consommation de cannabis, d) que le tétrahydrocannabinol (THC, le principal produit actif du cannabis) inhibe in vitro la chaîne respiratoire mitochondriale de cerveau de rat, et induit une génération significative de peroxyde d’hydrogène. La génération de radicaux libres pourrait être un des mécanismes possibles de toxicité cérébrale du THC en jeu lors d’un infarctus cérébral. / We showed that: a) there was a link between cannabis use and intracranial arterial multifocal stenosis in a series of ischemic stroke in the young, b) the prevalence of intracranial arterial stenosis was up to 31% in a series of 159 ischemic strokes in the young, c) 13% of the patients in this series sustained the angiographic criteria of reversible cerebral vasoconstriction syndrome, and that the precipitating factor was the use of cannabis in 67% of cases, d) tetrahydrocannabinol (THC, the main active component in cannabis) inhibits the respiratory mitochondrial chain of the brain in rats and induces a significant production of hydrogen peroxide. These results suggest that one of the mechanisms of brain toxicity induced by cannabis in ischemic stroke patients, may be the high rate of generation of free radicals induced by THC
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Conduite automobile risquée et cannabis : rôle de la fréquence de consommation et effet du soutien parental de l'autonomieLajeunesse, Jesseca 08 1900 (has links)
Bien que la conduite d’un véhicule motorisé soit une activité des plus usuelles, les accidents routiers font partie des dix premières causes mondiales de décès. Au cours des dernières années, les programmes canadiens et québécois de prévention en sécurité routière ont montré une certaine efficacité, observable notamment par une baisse des décès sur la route. Ces progrès sont toutefois insuffisants, et de meilleures stratégies d’intervention et de prévention doivent être développées. Une meilleure connaissance des personnes susceptibles d’être impliquées dans des accidents routiers permettrait le développement de campagnes plus ciblées et pertinentes. Ainsi, il est déjà reconnu que le fait d’être un homme, le fait d’être âgé entre 15 et 29 ans, et la consommation d’alcool ou de substances psychoactives, augmentaient le risque d’être impliqué dans un accident routier. De ce fait, l’un des objectifs de cette thèse est de mieux comprendre le rôle de la fréquence de consommation de cannabis dans la conduite automobile risquée chez les jeunes conducteurs de sexe masculin. D’autre part, des études se sont déjà intéressées au rôle joué par les parents dans les comportements routiers de leurs jeunes. Aucune étude ne semble toutefois s’être attardée au rôle du soutien à l’autonomie prodigué par les parents dans la prise de risques au volant des jeunes. Le second objectif de cette thèse est donc d’investiguer l’impact du soutien parental de l’autonomie dans la conduite automobile des jeunes consommateurs de cannabis.
Dans cette optique, l’Article 1 traite de l’association entre la fréquence de consommation de cannabis et la prise de risques au volant auto-rapportée auprès d’un échantillon de conducteurs masculins âgés entre 18 et 25 ans. De plus, il évalue le rôle du niveau de soutien parental de l’autonomie dans cette prise de risques auto-rapportée. Les résultats indiquent que la fréquence de consommation de cannabis est positivement associée à la prise de risques au volant, telle que mesurée par la variable de conduite sous l’influence du cannabis, et en est un prédicteur. Les résultats de cet article n’ont cependant pu démontrer que le soutien parental de l’autonomie était un prédicteur de la conduite automobile risquée auto-rapportée.
L’Article 2 étudie la conduite automobile risquée à travers des données comportementales de conduite automobile risquée, observées dans un contexte de simulation de conduite. Les résultats de ce deuxième article révèlent que la fréquence de consommation de cannabis contribue à prédire la conduite automobile risquée observée. En outre, les résultats indiquent un effet significatif des niveaux de fréquence de consommation sur la prise de risques au volant. Finalement, les résultats révèlent une contribution du niveau de soutien parental à l’autonomie dans la prise de risques au volant observée en simulation.
Enfin, la discussion porte sur les contributions théoriques de cette thèse aux connaissances scientifiques en sécurité routière, ainsi que ses implications pratiques pour la prévention et l’intervention. / Although driving a vehicle is one common activity, road accidents are one of the top ten causes of death in the world. In recent years, a decrease of on road deaths in Canada and Quebec have shown that road safety prevention campaigns can be effective. However, these advances are insufficient, and there is a need for better intervention and prevention strategies. A better knowledge of individuals likely to be involved in road accidents would allow the development of more targeted and relevant prevention campaigns. Thus, it is already known that men, individuals aged between 15 and 29, and users of alcohol or psychoactive substances before driving have an increased risk of being involved in a road accident. Therefore, one of the objectives of this thesis is to have a better understanding of the role of frequency of cannabis use in young males’ risky driving. Also, studies have already examined the role of parents in the road behaviors of their children. However, no study seems to have focused on the role of parental autonomy support in young drivers’ risky driving. The second objective of this thesis is to investigate the impact of parental autonomy support on risky driving among young cannabis users.
In this line of thinking, Article 1 investigates the association between frequency of cannabis use and self-reported risky driving among a sample of male drivers aged between 18 and 25 years old. In addition, it evaluates the role of parental autonomy support in self-reported risky driving. Results indicate that frequency of cannabis use is positively associated with risky driving (measured with self-reported measure of driving under the influence of cannabis), and is a predictor of this measure. However, results did not show that parental autonomy support is a predictor of self-reported risky driving.
Article 2 studies risky driving through behavioral measures. These behavioral measures are observed in a driving simulator. Results of this article reveal a contribution of frequency of cannabis use in predicting observed risky driving in a driving simulator. In addition, results indicate a significant effect of the frequency of use levels on risky driving behaviors observed in the simulated driving task. Finally, results show a contribution of parental autonomy support in observed risky driving in the simulator.
The theoretical contributions of this thesis to the scientific literature on road safety, as well as its practical implications for prevention and intervention are discussed.
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