Cognitive reappraisal, emotional expression and mindfulness in adaptation to bereavement: a longitudinal study

ABSTRACT Background and Objectives Maladaptive emotion regulation strategies increase prolonged grief and depressive symptoms following bereavement. However, less is known about the role of adaptive emotion regulation strategies in adaptation to loss. Therefore, we examined the concurrent and longitudinal associations of three putative adaptive emotion regulation strategies (cognitive reappraisal, emotional expression, and mindfulness) with prolonged grief and depression symptoms. Design A two-wave longitudinal survey. Methods A sample of 397 bereaved Dutch adults (89% female, mean age 54 years) completed validated questionnaires to assess trait cognitive reappraisal, emotional expression, mindfulness and prolonged grief and depression symptoms at baseline (T1) and 344 participants completed symptom measures again six months later (T2). Results Zero-order correlations demonstrated that mindfulness, cognitive reappraisal and emotional expression relate negatively to T1 and T2 prolonged grief and depression symptoms. In multiple regression analyses, controlling for relevant background variables, all emotion regulation strategies related negatively to T1 prolonged grief and depression symptoms. In multiple regression analyses, controlling for T1 symptoms and background variables, mindfulness predicted lower T2 depression symptoms. Conclusions Adaptive emotion regulation strategies relate negatively to post-loss psychopathology symptoms, yet only mindfulness longitudinally predicts lower depression symptoms. Dispositional mindfulness may be a protective factor in psychological adaptation to bereavement.


Introduction
The death of a loved one can be a highly distressing experience.Therefore, bereaved adults may develop mental health problems, including anxiety disorders, major depression, and posttraumatic stress disorder (Zisook et al., 2014).Additionally, a minority of bereaved individuals develops severe, persistent, and disabling grief, termed prolonged grief.Diagnoses characterized by such grief responses, termed prolonged grief disorder (PGD), have been included in the International Classification of Diseases (ICD-11: World Health Organization, 2018) and the text revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR, American Psychiatric Association, 2022).Effective psychological interventions have been developed to ameliorate prolonged grief symptoms and related mental health problems, such as cognitive-behavioral therapy and complicated grief therapy (Boelen et al., 2007;Eisma et al., 2015;Shear et al., 2016).A systematic review found that psychological interventions for prolonged grief on average to have moderate effect sizes on postloss psychopathology (Johannsen et al., 2019).A better understanding of changeable risk factors of post-loss psychopathology may help to improve current treatments.
Prolonged grief is characterized by severe emotional disturbances, e.g., yearning, sorrow, bitterness, guilt, anger, loneliness, and meaninglessness.Adaptation to bereavement requires effective strategies to manage these emotions.Therefore, emotion regulation is critical in the development and reduction of severe grief reactions (Eisma & Stroebe, 2021).Mental health problems that frequently co-occur with prolonged grief, such as depression, are also characterized by severe emotional disturbances (Komischke-Konnerup et al., 2021).While prolonged grief shares some affective features with depression (e.g., sadness, inability to experience positive mood) a distinctive feature of prolonged grief is separation distress (e.g., severe and persistent yearning for the deceased).Effective emotion regulation may thus also ameliorate prolonged grief and comorbid emotional problems.Emotion regulation is commonly defined as the way one influences one's experienced emotions, whether controlled or automatic, and conscious or unconscious (Gross, 1998).Individuals regulate their emotions in a variety of ways.Emotion regulation strategies are proposed to be either adaptive or maladaptive (Naragon-Gainey et al., 2017).A recent systematic review of empirical research on the relationships between emotion regulation strategies and prolonged grief symptoms has demonstrated that there is an overrepresentation of studies on putative maladaptive emotion regulation strategies, such as rumination or avoidance (Eisma & Stroebe, 2021).However, research aiming to elucidate the role of putative adaptive emotion regulation strategies in psychological adaptation to bereavement is scarce.The systematic review identified three emotion regulation strategies that may be helpful to bereaved adults: cognitive reappraisal, emotional expression, and mindfulness.
First, cognitive reappraisal is the ability to reinterpret and change the way one thinks about emotional situations (Gross & John, 2003).Positive reappraisal is the cognitive process by which stressful situations are reconstrued as valuable or beneficial.Following bereavement, cognitive reappraisal may help to reinterpret negative experiences, including secondary stressors (Eisma & Stroebe, 2021), thereby decreasing associated emotional distress.A large survey in Nigeria found a small positive association between deliberate rumination (akin to positive reappraisal) and prolonged grief symptoms (Chukwuorji et al., 2018).Another recent study showed a small negative association between cognitive reappraisal and depressive symptoms in bereaved adults (Chen & Fagundes, 2022).Together, the evidence hints towards a negative concurrent association between cognitive reappraisal and prolonged grief and depressive symptoms.This aligns with meta-analyses of research in non-bereaved samples reporting a small negative concurrent association of cognitive reappraisal with anxiety and depression (Aldao et al., 2010;Hu et al., 2014).However, longitudinal analyses among non-bereaved samples show mixed results; some survey studies show significant longitudinal effects on psychopathology symptoms whereas others do not (e.g., Brewer et al., 2016;Dawel et al., 2021).A lack of longitudinal research on this topic in bereaved samples makes it unclear if cognitive reappraisal could ameliorate post-loss psychopathology.
Second, emotional expression is the proposed adaptive counterpart of emotional suppression, a maladaptive emotional coping strategy that attempts to inhibit either the expression or the experience of emotions.Suppressing one's emotional reactions may deplete cognitive resources and can, in the long term, lead to distress, negative feelings about the self, as well as avoidant and anxious behavior (Aldao et al., 2010;Cutuli, 2014).Following loss, bereaved individuals might fear social disconnection when expressing their negative feelings to others, stimulating the suppression of emotions in social situations.Additionally, bereaved individuals may have trouble accepting their loss and avoid being confronted with its reality and associated negative emotions.This is proposed to hinder the integration of knowledge about the separation from the deceased with existing autobiographical knowledge in memory, leading to persistence of grief (Boelen, 2006).The suppression of emotions may co-occur with such avoidance strategies and may have similar effects.Accordingly, a recent survey of 630 predominantly bereaved (89%) and traumatized youth found a moderate positive correlation of emotional suppression with prolonged grief symptoms (Dodd et al., 2020) and smaller study among bereaved children yielded similar results (Kaplow et al., 2013).However, a study of bereaved adults did not support an association between emotional suppression and depressive symptoms (Chen & Fagundes, 2022).Mixed findings may be due to the fact that the positive associations of emotional suppression with levels of different types of psychopathology are estimated to be small (Hu et al., 2014) and therefore difficult to detect.Longitudinal and experimental research in non-bereaved samples shows that emotional expression sometimes does and sometimes does not predict lower psychopathology levels (e.g., Arditte & Joormann, 2011;Dawel et al., 2021;Ehring et al., 2010;Larsen et al., 2013;Matheson & Anisman, 2003).Thus, emotional expression potentially reduces psychopathology, yet due to mixed findings and a lack of longitudinal research among bereaved adults, it is unclear if this is also the case following loss.
Third, mindfulness can be defined as an open and receptive awareness that arises through paying attention, on purpose, in the present moment, non-judgmentally (Brown & Ryan, 2003;Kabat-Zinn, 2003).Mindfulness may help bereaved people through increased awareness of distressing thoughts and feelings, feeling how their body responds to these experiences, being open to these experiences and allowing them to be, and observing them with curiosity and kindness, nonjudgmentally (Farb et al., 2014).By engaging in mindfulness, negative thoughts and feelings may be perceived as more objective and less personal, providing a space to manage them in a more adaptive way and improving rationality (Quaglia et al., 2015).For example, one may more easily step out habitual unhelpful thinking and behavior (e.g., rumination, avoidance) which could improve the way one deals with negative loss-related emotions (Eisma et al., 2013).
A few empirical studies have examined the relation between mindfulness and post-loss psychopathology.A large cross-sectional survey among recently bereaved Chinese adults showed that mindfulness was negatively associated with anxiety, depression and prolonged grief symptoms (Tang et al., 2019).Another large cross-sectional survey recently replicated the negative association of mindfulness with depression and prolonged grief symptoms (Huang, 2022).Moreover, a mindfulness-based cognitive therapy intervention lowered depression symptoms but not prolonged grief symptoms in a non-randomized controlled pilot trial (O'Connor et al., 2014).In an open pilot trial of mindfulness-based care symptoms of depression, anxiety, and posttraumatic stress significantly decreased (Thieleman et al., 2014).Lastly, a larger randomized controlled trial tested the effects of mindfulness therapy against progressive muscle relaxation and a waitlist (Knowles et al., 2021).The results showed a significant reduction in prolonged grief symptoms over time in the mindfulness and progressive muscle relaxation groups.Yet, mindfulness did not significantly reduce prolonged grief symptoms relative to the waitlist.In summary, there is evidence for a cross-sectional association between mindfulness and bereavement-related psychopathology.Applying mindfulness techniques may thus reduce post-loss psychopathology, yet results from trials have been inconsistent.
Despite their potential theoretical and clinical importance, research on adaptive emotion regulation strategies in bereaved adults has been limited and results are mixed.Notably, no studies to date have yet aimed to clarify the longitudinal associations between the disposition to engage in adaptive emotion regulation strategies and post-loss psychopathology.Therefore, we will examine the concurrent and longitudinal relations between putative adaptive emotion regulation strategies with prolonged grief symptoms by applying multivariate models to longitudinal survey data.We hypothesize that cognitive reappraisal, emotional expression and mindfulness relate negatively to prolonged grief symptoms both concurrently and longitudinally.Since depression symptoms often co-occur with prolonged grief symptoms, and adaptive emotion regulation could similarly ameliorate such mental health problems, a secondary aim was to explore the concurrent and longitudinal associations of the three adaptive emotion regulation strategies with depressive symptoms.

Procedure and participants
The Ethical Committee Psychology of the University of Groningen approved this study (registration number: PSY-1819-S-0173).The study hypotheses and analyses were preregistered at aspredicted.org(https://aspredicted.org/mw8ra.pdf).The data was collected as a part of a larger longitudinal survey study on psychological adaptation to loss.Participants were eligible for this study if they had experienced a loss within the past five years.Participants were recruited via a website that contained a grief self-test and the content network of Google (Google Ads).The advertisement led to a website containing information about study goals and procedures.After providing online informed consent, participants could access a survey programmed in Qualtrics.At the end of the survey, participants were asked if they would be interested in participating in a longitudinal survey study.Those who were interested (N = 561) received invitations to complete another survey six and 12 months later.Two reminders were sent at each time point, two and three weeks after the initial invitation.
The present data is from the second and third wave of the survey.For reading ease, we refer to the second wave of the study as T1 and the third wave as T2.At T1, 397 adults (89% female; mean age: 53.68 years (SD = 12.74)) who experienced a loss on average 18.02 (SD = 14.81) months ago participated.A majority had experienced a non-violent loss (87%) of a partner (48%) or parent (31%).In total, 344 (87%) people who completed the T1 survey also filled out the T2 survey.Sample characteristics are shown in Table 1.

Cognitive reappraisal and emotional expression
Cognitive reappraisal and emotional expression were measured using the subscales of the Emotion Regulation Questionnaire (ECQ; Gross & John, 2003;Dutch version: Koole, 2004).Six items of the cognitive reappraisal subscale and 4 items of the emotional expression subscale were included.Sample items are: "I control my emotions by changing the way I think about the situation I'm in." (cognitive reappraisal) and "I keep my emotions to myself" (emotional expression).Participants had to indicate on a 7-point scale which ranged from 1 (strongly disagree) to 7 (strongly agree) to what extent they agree with each statement regarding themselves.Lower scores on the emotional expression scale indicated higher emotional expression.For ease of interpretation, a minus was added to the total scores of this scale, so that higher scores would indicate higher emotional expression.Higher scores on cognitive reappraisal indicate higher levels of cognitive reappraisal.In this sample, the reliability of the cognitive reappraisal subscale was good (α = .85).The reliability of the emotional expression subscale was acceptable (α = .79).

Mindfulness
A 6-item abbreviated version of the Mindful Attention Awareness Scale (MAAS; Brown & Ryan, 2003;Dutch 6-item version: Schroevers et al., 2008) was utilized to assess mindfulness.A sample item is: "I find myself doing things without paying attention."Participants indicated how frequently they have certain experiences on a 6-point scale ranging from 1 (almost always) to 6 (almost never).A total score can be calculated with higher scores indicating higher levels of mindfulness (range 6-30).
The reliability of the MAAS was excellent (α = .92).

Prolonged grief symptoms
To assess prolonged grief symptoms, we used the 22-item Traumatic Grief Inventory-Self Report Plus (TGI-SR+; Lenferink et al., 2022).The TGI-SR + can be used to assess symptoms of Persistent Complex Bereavement Disorder per DSM-5, and PGD per ICD-11 and DSM-5-TR.Participants had to indicate to what extent they experienced symptoms in the previous months on a 5-point scale ranging from 1 (never) to 5 (always).The total score was used as a general measure of prolonged grief symptoms in the main analyses.The internal consistency of the TGI-SR + was excellent (at T1, α = .94;at T2, α = .94).Symptoms of depression were measured using the 16-item Quick Inventory of Depressive Symptomatology (QIDS; Rush et al., 2003;Dutch version: Lako et al., 2014).Participants were asked to indicate on a 4-point scale ranging from 0 to 3 (varying anchors) how frequently they experience symptoms of depression (e.g., feeling restless, loss of concentration).The reliability of the QIDS was good (at T1, α = .82;at T2, α = .80).

Statistical analyses
First, we investigated the zero-order correlations between cognitive reappraisal, emotional expression, mindfulness, and prolonged grief and depression symptoms.Furthermore, we compared sociodemographic (age, gender, educational level), loss-related (time since loss, relationship with the deceased, sex of the deceased, cause of death, expectedness of the loss), independent (cognitive reappraisal, emotional expression, and mindfulness), and dependent variables (prolonged grief and depression symptoms) of study completers and people who only completed the T1 survey.We planned independent t-tests (for continuous variables) and Chi-squared tests (for categorical variables).We planned to use non-parametric tests in case assumptions were violated.
Second, we conducted four separate multiple regression analyses of all the sociodemographic variables and loss-related characteristics on prolonged grief symptoms and depression symptoms at T1 and T2 (the models predicting T2 symptom levels controlled for T1 symptom levels).Background variables that were found to be significant predictors of prolonged grief or depression levels at T1 and/or T2 were included in the main regression analyses for all outcomes.
We checked the assumptions of our main regression analyses regarding the relations of the three emotion regulation strategies with prolonged grief and depression symptoms.We inspected multicollinearity and linearity, normality of residuals, and homoscedasticity, using scatterplots, normal probability plots, and residual plots, respectively.The existence of outliers was inspected using Mahalanobis distances and we decided to remove outliers prior to our main regression analyses.
In the main analysis, four hierarchical regression analyses were conducted.In the first analysis, prolonged grief symptoms at T1 was the dependent variable.In the first step, relevant background variables were included as control variables.In the second step, cognitive reappraisal, emotional expression, and mindfulness were added as predictors.Next, another hierarchical regression was conducted including prolonged grief symptoms at T2 as the dependent variable.In the first step, the prolonged grief symptoms at T1 were added as a predictor.In the second step, relevant background variables were included as control variables.In the third step, cognitive reappraisal, emotional expression, and mindfulness were added as predictors.Next, two similar regression analyses were run using depression symptoms at T1 and T2 as a dependent variable, respectively.
Lastly, due to qualitative differences between current and past pathological grief criteria sets (Eisma et al., 2022a) sensitivity analyses were conducted to check if outcomes would vary if we used symptoms of ICD-11 and DSM-5-TR prolonged grief disorder as dependent variables.We ran two regressions analyses that were identical to the previous hierarchical regression analyses but included the summed scores for the DSM-5-TR and for the ICD-11 items of the TGI-SR + for prolonged grief disorder (scoring rules see: Lenferink et al., 2022) at T1 and T2 as independent variables.
All analyses were conducted using SPSS version 27 (IBM Corporation, 2020).

Preliminary analyses
Since the assumption of normality was mildly violated for some variables, we calculated nonparametric zero-order correlations between T1 cognitive reappraisal, emotional expression, mindfulness, and T1 and T2 prolonged grief symptoms and depression symptoms (see Table 2).Next, we investigated the differences in characteristics of the participants who completed the T1 and T2 survey and those who only completed the T1 survey.Significant differences were found on loss-related variables and demographics.Participants who completed both surveys were older, U (397) = 6961.00,p = .006,more likely to have experienced nonviolent loss, 88% vs. 77%, χ²(1) = 4.5, p = .033,compared to participants who only completed T1.No significant differences were found on the demographic variables gender and education level and the loss-related variables time since loss, gender of the deceased, relationship with the deceased, and loss expectedness.
Subsequently, we conducted four separate multiple regression analyses regressingall sociodemographic and loss-related characteristics on prolonged grief symptoms and depression at T1 and T2 (see Supplemental Tables 1 and 2).All variables that were significant predictors of any of these dependent variables were included in the main analyses as control variables.Therefore, we included educational level, time since loss, relationship with the deceased, cause of death, and expectedness of the loss in the main analyses.
We also checked the assumptions for the main analyses.Minor violations of the assumption of homoscedasticity and normality were observed.However, potential problems caused by the violation of the normality assumptions were countered by the large sample used in this study following the central limit theorem (Ernst & Albers, 2017).Heteroscedasticity does not represent a problem because estimations are consistent and unbiased if the variance is finite (Chatterjee & Hadi, 2006).

Hierarchical regression analyses of cognitive reappraisal, emotional expression, and mindfulness on prolonged grief and depression symptoms
The results of regression analyses for prolonged grief symptoms are shown in Table 3.The first model which included T1 prolonged grief symptoms as the dependent variable was significant, F(12, 368) = 23.05,p < .001.The previously identified control variables explained 14% of the variance in T1 prolonged grief symptoms, ΔF(9, 371) = 6.85, p < .001.In the second step, the independent variables cognitive reappraisal, emotional expression, and mindfulness explained an additional 29% of the variance, ΔF (3, 368) = 61.57,p < .001.Cognitive reappraisal (β = -.10,p = .013),emotional expression (β = -.22,p < .001),and mindfulness (β = -.43,p < .001)contributed significantly to the model.After including cognitive reappraisal, emotional expression, and mindfulness, the background variables time since loss, relationship with the deceased, and cause of death remained significant predictors of T1 prolonged grief symptoms.
A sensitivity analysis using summed scores of the DSM-5-TR items of the TGI-SR + for prolonged grief disorder and the summed scores of the ICD-11 items of the TGI-SR + for prolonged grief  disorder as dependent variables (instead of the sum score of the TGI-SR+), yielded nearly identical results.Significant effects remained significant and in the same direction, and are reported in Supplemental Tables 3 and 4.

Discussion
We sought to clarify the concurrent and longitudinal associations of cognitive reappraisal, emotional expression, and mindfulness with prolonged grief and depression symptoms among bereaved adults.Results showed negative concurrent and longitudinal zero-order correlations of all three adaptive emotion regulation strategies with prolonged grief and depression symptoms.In multivariate regressions, controlling for relevant sociodemographic and loss-related variables, negative concurrent associations were found between all adaptive emotion regulation strategies and prolonged grief and depression symptoms.In stringent multivariate regressions, controlling for baseline symptoms and relevant sociodemographic and loss-related variables, only mindfulness predicted lower depression symptoms over time, whereas none of the emotion regulation strategies predicted prolonged grief symptoms.Similar relationships emerged between cognitive reappraisal and emotional expression and postloss psychopathology.Whilst concurrently and longitudinally related to both prolonged grief and depression symptoms, stringent multivariate analyses did not demonstrate that either emotion regulation strategy significantly predicted incremental symptom change over a six-month interval.This suggests that these emotion regulation strategies are not protective factors for (the persistence of) loss-related psychopathology.Generally, results align with meta-analyses on non-bereaved samples demonstrating small concurrent negative associations between these emotion regulation strategies and psychopathology symptoms (Aldao et al., 2010;Hu et al., 2014), as well as nullresults on the longitudinal and causal effects of these strategies on psychopathology symptoms (Arditte & Joormann, 2011;Dawel et al., 2021;Ehring et al., 2010;Larsen et al., 2013).
Our findings regarding cognitive reappraisal suggest that this strategy may not be effective when dealing with a situation for which reframing is difficult or unrealistic.Bereavement is a major life stressor that is often is accompanied by negative life changes and a variety of additional stressors (Eisma & Stroebe, 2021).In such taxing circumstances, cognitive reappraisal may not substantially improve negative emotions.Indeed, even when people are trained in cognitive reappraisal, they can have difficulty applying this strategy effectively in stressful situations as stress reduces one's ability to apply this strategy (Raio et al., 2013).However, cognitive restructuring, which includes applying cognitive techniques to change catastrophic misinterpretations of one's own grief reactions (e.g., yearning sadness) has been proven effective in reducing such misinterpretations, related loss-related avoidance and prolonged grief symptoms (Boelen, 2006;Boelen et al., 2007Boelen et al., , 2011)).This apparent contradiction requires further scientific scrutiny, for example by conducting small-scale experiments analyzing the effects of specific cognitive restructuring techniques on grief severity.
Results on emotional expression similarly suggest that expressing emotions is negatively related to psychopathology but does not help reduce emotional problems following bereavement.This appears at odds with the fact that exposure to avoided aspects of the loss is a proven effective therapy for reducing prolonged grief symptoms, both as a stand-alone treatment and as an addon to treatment (Boelen et al., 2007;Bryant et al., 2014;Eisma et al., 2015).However, the expression of emotion is in and of itself not considered a working mechanism in such therapies.Rather, prolonged exposure to avoided aspects of the loss is thought to disconfirm catastrophic misinterpretations of grief reactions, which facilitates the cognitive processing of the loss, i.e., the integration of memories of the loss within existing autobiographical memory (Boelen et al., 2007).Therefore, emotional expression may not be critical to adjustment to loss.However, it is notable that emotional expression may relate differently to grief over time dependent on the type of expressed emotion.For example, Bonanno and Keltner (1997) found facial expressions of negative emotion increased grief intensity, whereas facial expressions of positive emotions lowered grief intensity.Additionally, the flexibility with which emotions can be modulated may be more important to psychological adaptation to bereavement than one's tendency to use particular emotion regulation strategies (Bonanno et al., 2004;Gupta & Bonanno, 2011).Since the adaptiveness of expressing one's emotions could be situation-dependent (e.g., expressing negative emotions may be helpful when around friends, but less helpful in a work setting), emotional flexibility rather than the tendency to express emotions may facilitate adjustment to loss.
Mindfulness appears more strongly negatively associated with loss-related psychopathology than cognitive reappraisal and emotional expression.Importantly, mindfulness also longitudinally predicted (a small amount of) incremental symptom change in depression symptoms, albeit not in prolonged grief symptoms.This suggests that a disposition to be mindful may be a protective factor for post-loss depressive symptoms.Findings align with prior cross-sectional surveys demonstrating negative associations between mindfulness and loss-related psychopathology (Tang et al., 2019;Huang, in press), as well as with a meta-analysis showing a negative association between mindfulness with depression symptoms in non-bereaved samples (Carpenter et al., 2019).Results also correspond with trials examining the effects of mindfulness-based therapies.Notably, O'Connor et al. (2014) found that mindfulness-based therapy reduced depression symptoms, but not prolonged grief symptoms, relative to a waitlist.A larger randomized controlled trial did not convincingly demonstrate that mindfulness-based therapy reduced prolonged grief symptoms (Knowles et al., 2021).This may imply that increasing mindfulness is not an effective way to reduce prolonged grief symptoms.Possibly, mindfulness may work in a way that is effective in reducing negative mood, but not severe and persistent grief reactions.It could be that non-judgmental awareness of one's thoughts and emotions could help increase positive thought and emotions (Garland et al., 2015) which would directly counteract negative mood and depressive symptoms, but is less helpful in the processing of a major negative life-event such as bereavement.Cognitive behavioral techniques focused on cognitive processing of the loss, including developing a coherent narrative of the story of the loss and direct exposure to avoided aspects of the loss, appear more effective in reducing prolonged grief symptoms (for a review: Doering & Eisma, 2016).Nevertheless, the effects of mindfulness on depressive symptoms suggest it is worthwhile to further investigate how mindfulness training can be helpful to distressed bereaved people.
Some limitations warrant mention.First, there were more higher-educated women in the present sample than in the general bereaved population.Whilst common to grief research on emotion regulation strategies (Eisma & Stroebe, 2021), replication in a sample with more men and lower education levels is warranted.Second, younger people who had experienced an unnatural loss were somewhat more likely to drop out.Possibly, results may have been different if these people would have continued participation.Third, we used a six-month interval for our longitudinal survey.Another time-interval may have yielded different outcomes.For example, cognitive reappraisal and emotional expression may temporarily reduce negative emotions and therefore the tendency to engage in these strategies could solely predict short-term outcomes.It may be worthwhile to examine whether the present results would hold when measuring constructs over shorter timeperiods, for example, when using daily reports of emotion regulation and mood (e.g., Moberly & Watkins, 2008).Another interesting avenue for future research is to examine, using ecological momentary assessment, if the temporary emotional response to stressors encountered by bereaved people in everyday life is affected by the use of adaptive emotion regulation strategies.Encouragingly, recent work supports the feasibility of daily diaries in bereaved adults, which can offer unique insights into the role of emotion regulation after loss (Eisma et al., 2022b).Fourth, the specific nature of our measures may have influenced outcomes.For example, we assessed the disposition to express emotions rather than what type of emotions are expressed in which circumstances, which may be more important in adaptation to loss.Lastly, our study could not clarify causal relationships between the variables under investigation.Experiments examining the effects of inducing mindfulness on negative mood (e.g., Gibb et al., 2022), may help elucidate whether mindfulness reduces emotional problems in bereaved people.
Despite these limitations, the present study has uniquely shed light on the longitudinal associations between putative adaptive emotion regulation strategies and prolonged grief and depression symptoms.Results suggest that cognitive reappraisal and emotional expression may not be protective factors of lossrelated psychopathology, whereas mindfulness may be a potential protective factor for depressive symptoms, but likely not for prolonged grief symptoms.Future longitudinal, experimental, and clinical trial research may further clarify the value of mindfulness in reducing emotional problems after bereavement.

Table 2 .
Nonparametric Zero-order Correlations between Main Variables.

Table 3 .
Hierarchical Regression Analyses of the Relationships between Emotion Regulation Strategies and Prolonged Grief Symptoms.

Table 4 .
Hierarchical Regression Analyses of the Relationships between Emotion Regulation Strategies and Depression Symptoms.