L’objectif principal de cette thèse est de comprendre l’adaptation psychophysiologique des individus au stress aigu et chronique et l’influence des différences individuelles. Dans ce but nous avons mené deux grandes études, sur le stress aigu et chronique respectivement. Dans la première expérience, nous présentons un protocole d’induction de stress aigu, une tâche de parler en public, qui a été efficace pour provoquer le stress psychosocial. Nous avons ensuite étudié l’adaptation au stress et la performance dans la tâche de parler en public de façon multidisciplinaire (i.e., psychologique, physiologique et comportementale). Nous avons mis en évidence que les mauvaises performances dans cette tâche étaient associées principalement avec les traits de personnalité (i.e., trait d’anxiété), les émotions, l’évaluation cognitive et le coping. De plus, nous avons mis en évidence un modèle de médiation montrant que le trait d’anxiété est lié aux mauvaises performances indirectement à travers le coping, indiquant un rôle important des capacités de gestion du stress. Finalement, nous avons trouvé que les déficits de régulation émotionnelle, comme l’alexithymie, étaient associés avec une augmentation significative de l’activité HPA sur le cortisol suggérant que l’alexithymie module la réponse physiologique du stress. Dans la seconde partie, nous avons étudié les conséquences du stress chronique à travers les problèmes de conduites alimentaires sur 675 étudiants Français et Chinois. Les résultats montrent un effet de médiation sur la relation négative entre un attachement parental sécurisé et les problèmes de conduite alimentaire à travers l’alexithymie et le neuroticisme. De plus, bien qu’une prévalence plus élevée ait été observée dans la population chinoise par rapport à la population française, nos résultats montrent que les conduites alimentaires problématiques liées au stress sont un problème psychologique général plutôt que culturel. Cette thèse a des implications pratiques puisqu’ elle propose un protocole d’induction au stress aigu qui peut être utilisé à l’entraînement. En apportant une meilleure compréhension des facteurs de risque dans les réponses au stress, il sera possible d’aider les individus à mieux faire face au stress et améliorer leur bien-être dans des situations de performance ou dans des pathologies liées au stress. / The primary objective of this thesis is to understand the psychophysiological adaptation of individuals to acute and chronic stress and how individual differences influence it. For this aim, we conducted two large studies with regards to acute and chronic stress, respectively. In the first experimentation, we presented a laboratory induced stress protocol (a public speaking task), which proved successful in eliciting acute psychosocial stressor. Next, we took into account the multidisciplinary assessment (i.e., psychological, physiological and behavioural) to study stress responses and performance. We found that the failure of stress performance was associated mainly with personality trait (i.e., trait anxiety), emotions, cognitive appraisals and coping. Moreover, we suggested a mediation model showing that trait anxiety linked to poor performance indirectly through coping, indicating an important role of the stress management ability. Finally, we found that emotion regulation deficit, i.e., alexithymia was associated with significant increased HPA activity on cortisol, suggesting alexithymia modulate physiological stress response. In the second part, we studied the chronic stress consequences on disordered eating in a total of 675 university student athletes in China and France. Results supported a mediation effect on the negative relationship between the secure parental attachment and disordered eating through alexithymia and neuroticism. Furthermore, despite a higher prevalence was observed in the Chinese sample than in French, our results suggested this stress-related eating behaviour was a general psychological problem rather than a cultural issue. This thesis has practical meanings in providing an acute stress protocol which can be put into training. By understanding risk factors for stress responses, performance and stress-related illness, we may indeed help individual to cope better with stress and increase their well-being.

Minimal empirical research using longitudinal data to explore integrative models of eating disorder development exists. The purpose of this study was to further explore multidimensional models incorporating parental attachment, history of stress, appraisal/coping processes, internalization of the thin-ideal, negative affect, body image, and eating disordered behavior using prospective, longitudinal data. The models were evaluated using 238 participants who completed an initial series of self-report questionnaires during their first semester in college and completed follow-up questionnaires 6 months and 18 months later. Structural equation modeling was used to examine the relationships among the factors. Analyses confirmed that college freshman with insecure parental attachment relationships and those with a history of previous stressful experiences appraised the adjustment to college as more stressful and reported feeling less able to cope with the transition; these conditions predicted increased negative affect and increased eating disturbances. Women who reported experiencing negative affect and those that endorsed internalization of the thin-ideal also reported higher levels of body dissatisfaction; these women engaged in more disordered eating attitudes and behaviors. A second model investigating negative affect as mediating the relationship between the appraisal/coping process and eating disturbances also revealed that experiencing difficulties with the transition to college predicted later negative mood states. Further, women who reported increased negative affect also reported increased eating disturbances. Finally, cross-lagged and simultaneous effects between selected factors were evaluated. Results from these analyses are mixed, but they provide additional information about the predictive relationships among factors that play a role in the development of eating disorders. The results of this study provide valuable information about the development of eating disorders that can be used to aid prevention and treatment. Examination of these models in a large independent sample might provide confirmation of these relationships, and investigation of the models during different developmental periods might also provide important information about the development of eating disturbances and those individuals who are most at risk.

The present study provides information about the relationships between parental reactions to their children‘s expression of negative emotions at 8 months, parent-infant attachment at 12 and 15 months and parental reactions to children‘s negative emotional expressions at 24 months, and as well as the extent to which all of these variables predict children‘s emotional expressivity as toddlers at 24 months, after controlling for infant emotional reactivity. Analyses showed that parental responses to infant negative emotions, insecure attachment and parental responses to toddlers‘ negative emotions as well as infant emotional reactivity all made independent contributions to predicting toddler negative (vs. positive) affect. Only insecure infant-parent attachment, not parental socialization or infant emotional reactivity, predicted toddler flat (vs. expressive) affect. The inclusion of fathers in this study is important not only to clarify how mothers and fathers differ in socializing their children‘s negative emotions, but also to have a more complete study of how emotional expressivity develops. Analyses conducted separately by parent gender revealed differences in the relationship between parental socialization, attachment and emotional expressivity across mothers and fathers, indicating that researchers should continue to include fathers in studies of socialization of emotional expressivity. / text

This study examined social and psychological factors influencing the career exploration process of young adults. The predictor variables of this study were parental attachment, peer attachment, and self-efficacy; the outcome variables were environmental/occupational exploration, self-exploration, and career indecision. Data for this study were collected using various measures that were compiled into one survey hosted on Qualtrics. Results indicated that secure maternal attachment predicted secure peer attachment and high self-efficacy in young adults. Greater peer attachment was negatively correlated with environmental exploration. A higher level of self-efficacy was positively correlated with environmental exploration and negatively correlated with career indecision. These results imply that maternal attachment has an indirect influence on a young adult’s career exploration process.

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There are numerous ways to measure or estimate parental attachment, from which can be deduced a positive, neutral, or negative relationship between adult child and parent. A standardized measure of parental attachment was administered to participants in this study, in order to determine a rating scale that can be worked with statistically to determine possible connections between the attachment measure and GP A. To that end, this study used the Revised Inventory of Parent and Peer Attachment, (IPPA-R). The relationship between parent and child has profound effects on an individual throughout their life. Even in adulthood, the attachment of adult children to their parents affects their attitudes and achievement. It is a relationship common to all. Even if the person is orphaned or abandoned, if this relationship between parental attachment and adult achievement can be demonstrated statistically, it may lead the way in learning to focus the positive power of parental attachment into measurable achievement for the adult child. It is hoped that this research may lead to further study about parental attachment and the impact it may have on academic achievement, and perhaps extrapolated to increasing achievement in other areas. The goal of this study was to measure the influence of parental attachment upon the academic achievement of adult children, measured by the Revised Inventory of Parent and Peer Attachment (IPPA-R) developed by Amsden and Greenberg (2009). The IPPAR is a revision to the original Inventory of Parent and Peer Attachment, first developed by Amsden and Greenberg in 1987. The original version had questions that were directed toward both parents together, such as "My parents respect my feelings ... " (Amsden & Greenberg, 1987). In the IPPA-R, the same question was broken down into questions for both father and mother. The same question in the IPPA-R would be, "My mother respects my feelings ... " and "My father respects my feelings ... " (Amsden & Greenberg, 1987). Participants for this study were recruited from a junior level Psychology class at the University of Central Florida. Extra credit was awarded for participation. A total of 106 students participated in this study. Of the total 106 surveys submitted, 3 surveys were incomplete, thereby reducing the number of participants to 103. Informed consent was provided by participants at the beginning of the survey. Along with the mother and father sections of the IPPA-R, the questionnaire included demographic inquiries, such as race, age and gender. Along with these questions, the request for grade point average (GPA) was included. Academic achievement was measured by GPA at the university level. GPA was recorded on a 1-4 scale, using 2 decimal points. The independent variable in this study was parental attachment with seven levels. GPA served as the dependent measure. Data were analyzed using a one way between subject Analysis of Variance, (ANOV A). GPA did not significantly differ as a function of parental attachment, F(6,97)= 1.758, p=0.116. Previous research using the IPPA-R as a psychometric tool has shown significant effects when parental attachment is compared to psychological well-being (Gullone & Robinson, 2005), as well as other, more diverse variables, such as tendencies toward drug abuse among female teenagers (Renes & Strange, 2009) and commitment to career choices (Ward, 2003). This study made use of the IPPA-R measure, as the above mentioned research did, but the dependent variable of GPA was different than other research using the IPPAR. Most research with the IPPA-R seeks to measure psychological well being, or some aspect of it. The present research differed from previous studies in that this project used academic achievement as the dependent variable. Academic achievement at the university level can be extremely important to life and career directions adult children may choose. Despite the lack of statistical evidence, several interesting issues were raised. These issues, as well as possible directions for future research, are discussed.

Les conduites à risques des jeunes sont au centre des politiques de santé publique actuelles. Afin de tenter de prévenir leur occurrence, il semble important d’en comprendre les origines. Dans cette logique, ce travail doctoral s’intéresse aux facteurs psychologiques de vulnérabilité à la consommation d’alcool et aux troubles alimentaires subcliniques chez les jeunes. Plus spécifiquement, il appréhende les influences de l’attachement parental, la personnalité et l’alexithymie sur ces conduites au travers de modèles complexes. Trois études ont été mises en place. La première a permis d’explorer le rôle de l’attachement parental et du concept de soi dans la consommation d’alcool des adolescents (N = 245). La seconde a souligné les effets directs et indirects de l’attachement parental, la personnalité et l’alexithymie sur la consommation d’alcool et les troubles alimentaires subcliniques au sein d’une population d’étudiants sportifs (N = 434). La troisième a mis en évidence l’existence de relations directes et indirectes entre l’attachement parental, les facettes de la personnalité, l’alexithymie et les troubles alimentaires subcliniques des athlètes de haut niveau (N = 275). Les résultats révèlent que les comportements risqués des jeunes sont liés à un attachement parental insécurisé et à des difficultés dans l’identification et la description de leurs émotions. La consommation d’alcool est associée à un faible caractère consciencieux alors que les troubles alimentaires subcliniques sont liés à un névrosisme élevé. Plus précisément, l’attachement parental insécurisé favorise la consommation d’alcool au travers de son influence sur le caractère consciencieux et la régulation des affects. Ce type d’attachement contribue également à l’occurrence des troubles alimentaires des sportifs en induisant un névrosisme élevé, et plus particulièrement une forte impulsivité chez les athlètes de haut niveau. / Risk-taking behaviours of young people are issues that need to be addressed. Understanding their origins could prevent them from wide spreading. Consequently, this thesis focused on the psychological factors of vulnerability to alcohol use and subclinical eating disorders amongst young people. More specifically, we examined the influences of parental attachment, personality characteristics and alexithymia on these risk-taking behaviours through different models. Three studies have been carried out. The first one aimed to assess the role of the parental attachment and self-concept in alcohol use of adolescents (N = 245). The second one identified direct and indirect effects of parental attachment, personality characteristics and alexithymia on alcohol use and subclinical eating disorders amongst a sample of student athletes (N = 434). The third study emphasized the direct and indirect relationships between parental attachment, personality facets, alexithymia and subclinical eating disorders amongst a sample of elite athletes (N = 275). The findings provided evidence that risk-taking behaviours of young people were linked with an insecure parental attachment and difficulties in identifying and describing their feelings. Alcohol use was related to low conscientiousness whereas subclinical eating disorders were related to high neuroticism. Insecure parental attachment influenced alcohol use through its influence on conscientiousness and difficulties in identifying one’s feelings. Finally insecure attachment influenced subclinical eating disorders through high neuroticism, and specifically high impulsivity amongst elite athletes.Key words: alcohol use, subclinical eating disorders, parental attachment, alexithymia, personality factors, adolescents, student athletes, elite athletes.

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