Mariana V. Martins
University of Porto
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Mariana V. Martins.
Human Reproduction | 2011
Mariana V. Martins; Brennan D. Peterson; Vasco Almeida; Maria Emília Costa
BACKGROUND Social support can be a critical component of how a woman adjusts to infertility, yet few studies have investigated its impact on infertility-related coping and stress. We examined relationships between social support contexts and infertility stress domains, and tested if they were mediated by infertility-related coping strategies in a sample of infertile women. METHODS The Multidimensional Scale of Perceived Social Support, the Copenhagen Multi-centre Psychosocial Infertility coping scales and the Fertility Problem Inventory were completed by 252 women seeking treatment. Structural equation modeling analysis was used to test the hypothesized multiple mediation model. RESULTS The final model revealed negative effects from perceived partner support to relationship concern (β = -0.47), sexual concern (β = -0.20) and rejection of childfree lifestyle through meaning-based coping (β = -0.04). Perceived friend support had a negative effect on social concern through active-confronting coping (β = -0.04). Finally, besides a direct negative association with social concern (β = -0.30), perceived family support was indirectly and negatively related with all infertility stress domains (β from -0.04 to -0.13) through a positive effect of active-avoidance coping. The model explained between 12 and 66% of the variance of outcomes. CONCLUSIONS Despite being limited by a convenience sampling and cross-sectional design, results highlight the importance of social support contexts in helping women deal with infertility treatment. Health professionals should explore the quality of social networks and encourage seeking positive support from family and partners. Findings suggest it might prove useful for counselors to use coping skills training interventions, by retraining active-avoidance coping into meaning-based and active-confronting strategies.
Journal of Social and Personal Relationships | 2013
Mariana V. Martins; Brennan D. Peterson; Patrício Costa; Maria Emília Costa; Rikke Lund; Lone Schmidt
Individuals perceiving high social support tend to perceive better adjustment to infertility. However, it remains unclear whether this benefit is affected by the actual disclosure of the infertility condition. The present study aimed to examine the role of disclosure of fertility status in moderating the relationship between perceived social support and fertility-related stress. The study population (N = 698) was drawn from a longitudinal cohort design of Danish men and women beginning fertility treatment with a 12-month follow-up. Participants were 698 subjects (364 women and 334 men) who completed self-administered questionnaires measuring perceived social support at T1, and fertility status disclosure and fertility stress at T2. Results indicated that when infertility is not disclosed to at least a close relationship, the beneficial effects of social support on both social and personal stress cease to exist. Also, when participants perceived high social support, higher levels of social and personal stress were associated with keeping infertility a secret within close relationships, but when low social support was perceived, high social and personal stress levels were associated with disclosing infertility to all close relationships. Findings from this study provide evidence that the prospective relationship between social support and fertility-related stress is moderated by the decision of disclosing infertility. Infertility health professionals can help couples in deciding to which contexts they should disclose their infertility by assessing social support.
Fertility and Sterility | 2014
Mariana V. Martins; Patrício Costa; D. Brennan Peterson; Maria Emília Costa; Lone Schmidt
OBJECTIVE To compare the trajectories of infertility-related stress between patients who remain in the same relationship and patients who repartner. DESIGN Longitudinal cohort study using latent growth modeling. SETTING Fertility centers. PATIENT(S) Childless men and women evaluated before starting a new cycle of fertility treatment and observed for a 5-year period of unsuccessful treatments. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) Marital stability and infertility-related stress. RESULT(S) The majority of patients (86%) remained with their initial partner, but 14% of participants separated and repartnered while pursuing fertility treatments. Marital stability significantly predicted the initial status of infertility stress and infertility stress growth levels. Specifically, patients who repartnered had higher infertility stress levels at all time points compared with those who remained in the same relationship, regardless of the partner they were with at assessment. Furthermore, results showed an increasing stress trajectory over time for those who repartnered, compared with those who remained in a stable relationship. CONCLUSION(S) Men and women in fertility treatment who form a second union have higher initial levels of stress in their original relationship and higher changes in stress levels over the course of treatments. These findings suggest that high infertility-related stress levels before entering fertility treatment can negatively affect the stability of marital relationships and lead to repartnering.
Journal of Assisted Reproduction and Genetics | 2017
Juliana Pedro; Maria Pedro Sobral; Joana Mesquita-Guimarães; Carla Leal; Maria Emília Costa; Mariana V. Martins
PurposeThis study aims to explore the role of infertility-psychosocial variables on treatment discontinuation after controlling for demographic and biomedical variables in couples seeking reimbursed fertility treatment.MethodsA prospective study was conducted in 139 couples seeking fertility treatment. Between February 2010 and March 2011, participants completed measures of anxiety (STAI-State), depression (BDI-II), infertility-stress (FPI), and infertility coping strategies (COMPI-CSS). Medical data related to diagnosis, treatment, and discontinuation were collected in December 2013. A multiple logistic regression was performed to identify the predictors of discontinuation.ResultsThe discontinuation rate was 29.5%. Female education level, engagement in ART procedures, and female causation decreased the likelihood of treatment discontinuation, whereas female age and depression increased the likelihood of discontinuation. Female depression was the strongest predictor in this model. The model correctly identified 75.5% of cases.ConclusionsFemale age and female depression are associated with a higher likelihood of treatment discontinuation in couples seeking treatment. Reproductive health professionals should therefore inform couples about the link between the fertility treatment discontinuation and both female age and female depression. Couples in which female partners present clinically relevant depression should be referred to a mental health professional to prevent premature abandonment of fertility treatments and thus increase success rates.
Journal of Biological Chemistry | 2015
Maria Teresa Almeida; Francisco Sarmento Mesquita; Rui Cruz; Hugo Osório; Rafael Custódio; Cláudia Brito; Didier F. Vingadassalom; Mariana V. Martins; John M. Leong; David W. Holden; Didier Cabanes; Sandra Sousa
Background: Non-muscle myosin IIA is involved in force generation, movement, and membrane reshaping. Its activity is regulated by phosphorylation of the light chain. Results: NMHC-IIA head domain is tyrosine-phosphorylated by Src and modulates Listeria intracellular levels. Conclusion: Tyrosine phosphorylation of NMHC-IIA affects the outcome of infection. Significance: This novel post-translational modification of NMHC-IIA possibly affects its functions. Bacterial pathogens often interfere with host tyrosine phosphorylation cascades to control host responses and cause infection. Given the role of tyrosine phosphorylation events in different human infections and our previous results showing the activation of the tyrosine kinase Src upon incubation of cells with Listeria monocytogenes, we searched for novel host proteins undergoing tyrosine phosphorylation upon L. monocytogenes infection. We identify the heavy chain of the non-muscle myosin IIA (NMHC-IIA) as being phosphorylated in a specific tyrosine residue in response to L. monocytogenes infection. We characterize this novel post-translational modification event and show that, upon L. monocytogenes infection, Src phosphorylates NMHC-IIA in a previously uncharacterized tyrosine residue (Tyr-158) located in its motor domain near the ATP-binding site. In addition, we found that other intracellular and extracellular bacterial pathogens trigger NMHC-IIA tyrosine phosphorylation. We demonstrate that NMHC-IIA limits intracellular levels of L. monocytogenes, and this is dependent on the phosphorylation of Tyr-158. Our data suggest a novel mechanism of regulation of NMHC-IIA activity relying on the phosphorylation of Tyr-158 by Src.
The European Journal of Contraception & Reproductive Health Care | 2017
Carla Conceição; Juliana Pedro; Mariana V. Martins
Abstract Objectives: Recent evidence has shown that young adults have poor knowledge about reproductive health and fertility, and that interventions are needed to increase fertility awareness. The aim of this study was to assess the effectiveness of a brief video in increasing knowledge about fertility and infertility in young adults. Methods: We carried out a two-arm, parallel-group, randomised controlled trial with a pre-test/post-test design (NCT02607761, ClinicalTrials.gov). The sample was composed of 173 undergraduates who completed a self-report questionnaire. Participants were randomly assigned to exposure or no exposure to an educational video about reproductive health and infertility (intervention group, n = 89; control group, n = 84). Results: At baseline, participants revealed poor knowledge of infertility risk factors and fertility issues, and average knowledge of the definition of infertility. Interaction effects between group and time were found for all variables targeted in the video. Participants in the intervention group significantly increased their knowledge of fertility issues, infertility risk factors and the definition of infertility. No significant differences in post-test knowledge were observed in the control group, except for the age at which there is a marked decrease in female fertility. Conclusions: A short video intervention is effective in increasing short-term knowledge about reproductive health and infertility. If future research using longer intervals corroborates our findings, video intervention could be a useful tool in public health prevention campaigns.
Human Reproduction | 2017
Maria Pedro Sobral; Maria Emília Costa; Lone Schmidt; Mariana V. Martins
STUDY QUESTION Are the Copenhagen Multi‐Centre Psychosocial Infertility research program Fertility Problem Stress Scales (COMPI-FPSS) a reliable and valid measure across gender and culture? SUMMARY ANSWER The COMPI-FPSS is a valid and reliable measure, presenting excellent or good fit in the majority of the analyzed countries, and demonstrating full invariance across genders and partial invariance across cultures. WHAT IS KNOWN ALREADY Cross-cultural and gender validation is needed to consider a measure as standard care within fertility. The present study is the first attempting to establish comparability of fertility-related stress across genders and countries. STUDY DESIGN SIZE, DURATION Cross-sectional study. First, we tested the structure of the COMPI-FPSS. Then, reliability and validity (convergent and discriminant) were examined for the final model. Finally, measurement invariance both across genders and cultures was tested. PARTICIPANTS/MATERIALS, SETTING, METHODS Our final sample had 3923 fertility patients (1691 men and 2232 women) recruited in clinical settings from seven different countries: Denmark, China, Croatia, Germany, Greece, Hungary and Sweden. Participants had a mean age of 34 years and the majority (84%) were childless. MAIN RESULTS AND THE ROLE OF CHANCE Findings confirmed the original three-factor structure of the COMPI-FPSS, although suggesting a shortened measurement model using less items that fitted the data better than the full version model. While data from the Chinese and Croatian subsamples did not fit, all other counties presented good fit (&khgr;2/df ⩽ 5.4; comparative fit index ≥ 0.94; root-mean-square error of approximation ⩽ 0.07; modified expected cross-validation index ⩽ 0.77). In general, reliability, convergent validity, and discriminant validity were observed in all subscales from each country (composite reliability ≥ 0.63; average variance extracted ≥ 0.38; squared correlation ≥ 0.13). Full invariance was established across genders, and partial invariance was demonstrated across countries. LIMITATIONS REASONS FOR CAUTION Generalizability regarding the validation of the COMPI-FPSS cannot be made regarding infertile individuals not seeking treatment, or non-European patients. This study did not investigate predictive validity, and hence the capability of this instrument in detecting changes in fertility-specific adjustment over time and predicting the psychological impact needs to be established in future research. WIDER IMPLICATIONS OF THE FINDINGS Besides extending knowledge on the psychometric properties of one of the most used fertility stress questionnaire, this study demonstrates both research and clinical usefulness of the COMPI-FPSS. STUDY FUNDING/COMPETING INTEREST(S) This study was supported by European Union Funds (FEDER/COMPETE—Operational Competitiveness Program, and by national funds (FCT—Portuguese Foundation for Science and Technology) under the projects PTDC/MHC-PSC/4195/2012 and SFRH/BPD/85789/2012). There are no conflicts of interest to declare. TRIAL REGISTRATION NUMBER N/A
Journal of Reproductive and Infant Psychology | 2017
Carina Santos; Maria Pedro Sobral; Mariana V. Martins
Abstract Objective: To compare the occurrence and degree of stress attributed to life events during childhood/adolescence and adulthood between individuals diagnosed with infertility and presumably fertile individuals, and to examine the effect of life events occurrence and stress levels on an infertility diagnosis. Background: Although stress has been explored as a consequence of the experience of infertility, its role as a predictor of this disease still lacks research, particularly regarding the use of adequate control groups composed of non-parents. Methods: The final sample had 151 infertile subjects (74 males and 77 females) and 225 presumably fertile participants (95 males and 130 females), who completed a questionnaire indicating occurrence (y/n) and degree of stress of life events (1–5) during childhood/adolescence and adulthood. Results: Significant differences regarding occurrence were found in seven stressful life events in men and in nine events in women, with infertile groups presenting higher occurrence than presumably fertile groups. Eleven stressful life events were rated differently by men and women regarding the degree of stress, with group significant differences observed in both directions. While most events were rated as more stressful by infertile men, infertile women reported less stress resulting from these events than presumably fertile women. After controlling for age, the degree of stress induced by life events in childhood/adolescence and adulthood were not significant predictors of infertility diagnosis, for both men and women. Conclusion: The amount of stress associated with earlier or concurrent life events does not seem to be related with infertility. Further prospective research is needed to validate these findings.
Journal of Health Psychology | 2016
Juliana Pedro; Yoon Frederiksen; Lone Schmidt; Hans Jakob Ingerslev; Robert Zachariae; Mariana V. Martins
We compared the psychometric properties of COMPI Fertility Problem Stress Scales, Fertility Problem Inventory, and Fertility Quality of Life Tool in 293 patients enrolled for assisted reproductive technology. COMPI Fertility Problem Stress Scales and Fertility Problem Inventory subscales presented higher internal consistency. COMPI Fertility Problem Stress Scales differentiated best between its domains. Fertility Problem Inventory revealed better concurrent validity. Fertility Quality of Life Tool presented better fit. While discrimination for depression was similar between measures, Fertility Quality of Life Tool was better at discriminating anxiety. Results suggest that while all compared measures are reliable and valid in assessing the psychosocial adjustment to infertility, the choice of measure should be based according to the assessment goals.
Upsala Journal of Medical Sciences | 2018
Juliana Pedro; Tânia Brandão; Lone Schmidt; Maria Emília Costa; Mariana V. Martins
Abstract Introduction: Recent evidence indicates that reproductive-age people have inadequate fertility awareness (FA) concerning fertility, infertility risk factors, and consequences of delaying childbearing. However, no study has tried to summarize these studies and to clarify the variables associated with FA, namely the role of gender, age, education, and reproductive status on FA. Methods: A literature search up to February 2017 was conducted using the EBSCO, Web of Science, Scielo, and Scopus electronic databases with combinations of keywords and MeSH terms (e.g. ‘awareness’ OR ‘health knowledge, attitudes, practice’ AND ‘fertility’; ‘fertile period’; ‘assisted reprod*’). Results: Seventy-one articles met the eligibility criteria and were included. The main results showed that participants report low-to-moderate FA. Higher levels of FA were shown by women, highly educated individuals, people who reported difficulties with conceiving, and those who had planned their pregnancies. Having or desiring to have children was not related to FA level. An inconsistent association between study participant age and FA was observed, with some studies indicating that older participants had higher FA, but others found an opposite result or did not find any association. Conclusion: The current findings suggest that interventions to increase FA are warranted, especially those targeting men, people with low education, and in family planning settings. Interventions and campaigns should be customized to meet individuals’ needs regarding FA. Because of the high heterogeneity regarding the assessment of FA, these conclusions must be interpreted with caution.