Abstract
Suicide belongs to the leading causes of death worldwide. The present longitudinal study investigated physical activity (for example jogging, cycling) and positive mental health (PMH) as potential factors that can reduce the risk of suicide ideation and suicidal behavior. Data of 223 participants (79.4% women; Mage (SDage) = 22.85 (4.05)) were assessed at two measurement time points over a three-year period (2016: first measurement = baseline (BL); 2019: second measurement = follow-up (FU)) via online surveys. The results reveal a significant positive relationship between higher physical activity (BL) and higher PMH (BL). Higher scores of both variables were significantly negatively linked to lower suicide-related outcomes (FU). Moreover, the association between higher physical activity (BL) and lower suicide-related outcomes (FU) was significantly mediated by higher PMH (BL). The current findings demonstrate that physical activity in combination with PMH can reduce the risk of suicide-related outcomes. Fostering physical activity and PMH may be relevant strategies in the prevention of suicide ideation and suicide behavior.
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Introduction
Worldwide, suicide is among the major causes of deaths. Every year, about 800,000 people die to suicide (World Health Organization 2014). In Germany, a total of 9,396 suicide deaths were registered in the year 2018; on average 25 people died every day to suicide (German Federal Statistical Office 2020). Especially, young individuals who belong to the age group that is termed as emerging adulthood (18 to 29 years; Arnett 2000) are at enhanced risk for suicide ideation and suicidal behavior in Germany as well as in other countries (e.g., De Catanzaro 1991, 1995; Nock et al. 2014; Voss et al. 2019; World Health Organization 2014).
Suicide ideation – including the passive wish to die as well as concrete considerations how to die by suicide – is an important predictor of suicide attempts, i.e., self-injurious actions intended to kill oneself (O’Connor and Nock 2014). Jahangard et al. (2020, p.76) described suicide ideation as “the result of biased social cognition, social impairment and disconnected social life”. Individuals at risk for suicide typically perceive themselves as a burden for their social network and believe that their death will be a benefit for others (Joiner 2005; Joiner et al. 2016). Suicide-related outcomes (i.e., suicide ideation and suicide attempts) are closely linked to depression (De Catanzaro 1991, 1995): On the one hand, suicide ideation and suicide attempts are key criteria of major depressive disorders (see Diagnostic and Statistical Manual of Mental Disorders, DSM-5; American Psychiatric Association 2013). On the other hand, depression symptoms positively predict suicide-related outcomes (Ribeiro et al. 2018; Teismann et al. 2018). Furthermore, both suicide ideation and suicide attempts are positively linked to sleep disturbances (Khazaie et al. 2020; Krakow et al. 2011; Pompili et al. 2013; Stanley et al. 2017), anxiety symptoms (Ribeiro et al. 2014), and can also be associated with a state of physical and psychological overarousal (Ribeiro et al. 2014; Rudd et al. 2006). On the neurobiological basis, individuals with enhanced suicide ideation and these who survived a suicide attempt have decreased levels of (unextracted) oxytocin concentration (Chu et al. 2020; Jahangard et al. 2020). The decrease of the hormone is positively associated with stress experience, feelings of social exclusion, disconnection and sadness (Bosch and Young 2018; Pohl et al. 2019).
Especially against the background that recent research described an increase of both suicide ideation and suicide attempts in the last years especially among young people (Twenge et al. 2018), it is of great importance to reveal factors that can directly or in interaction with each other reduce the risk of suicide-related outcomes, specifically in emerging adulthood.
Previous research reported that physical activity offers profound mental health benefits: As such, research suggests that physical activity programs are as effective as other intervention strategies in the treatment of unipolar depressive disorders (Kvam et al. 2016; Schuch et al. 2016), as well as the treatment of schizophrenia (Firth et al. 2015). A recent meta-analysis found evidence that physical activity confers a significant protective effect on suicide ideation in adults (Vancampfort et al. 2018) and some studies described that physical active persons demonstrated lower rates of suicide attempts (Simon et al. 2004; Taliaferro et al. 2011). However, other research reported no significant associations between physical activity and suicide ideation (Choquet et al. 1993) as well as suicide attempts (Sabo et al. 2005). Considering the mixed findings, Lester et al. (2010) assumed that the link between physical activity and suicide-related outcomes could be mediated through further factors such as the level of mental health. The authors emphasized the need of longitudinal research to understand the mechanisms underlying the beneficial effects of physical activity.
According to the dual-factor model (e.g., Keyes 2005), mental health consists of two interrelated but separate unipolar dimensions: negative and positive. Previous research on suicide-related outcomes mainly focused on the negative dimension: Physical activity can reduce factors such as the experience of stress, depression symptoms and anxiety symptoms; factors known to foster suicide-related outcomes (Brailovskaia et al. 2018; Oler et al. 1994; Schuch et al. 2016; Stubbs et al. 2017; Wunsch et al. 2017). Moreover, one might speculate that engagement in team-based physical activity such as football and basketball might decrease feelings of disconnection and social exclusion that both are associated with the oxytocin level (Babiss and Gangwisch 2009). Thus, it can be assumed that variables of negative mental health (e.g., depression and anxiety symptoms) mediate the link between physical activity and suicide-related outcomes. If physical activity reduces the negative variables, this can contribute to the decrease of suicide-related outcomes.
However, it remains unclear, whether the positive dimension of mental health is also significantly included in the association between physical activity and suicide-related outcomes. Positive mental health (PMH) – as assessed with the PMH-Scale (Lukat et al. 2016) – comprises facets of subjective well-being such as life satisfaction and psychological well-being, especially self-acceptance and self-efficacy (Teismann and Brailovskaia 2020). Following previous research, PMH can serve as a protective factor against suicide-related outcomes (e.g., Brailovskaia et al. 2019). In cross-sectional and longitudinal studies (Brailovskaia et al. 2019; Siegmann et al. 2019; Teismann et al. 2018), PMH contributed to a lower risk of suicide-related outcomes and predicted remission from suicidal thoughts and reduced suicide attempts (Teismann et al. 2019; Teismann et al. 2016). On this background, it can be assumed that PMH may – as a mediator – fostering the impact of physical activity on suicide-related outcomes (cf., Johnson 2016): The engagement in physical activity could foster the experience of positive emotions. Particularly, the improvement of one’s physical performance and the achievement of self-imposed physical goals, for instance, the increasing of the own jogging speed, might contribute to mood improvement and increase an individual’s sense of control and self-efficacy (Eime et al. 2013; Rebar et al. 2015). These factors could contribute to an increase of PMH. An enhanced level of PMH could therefore contribute to the decrease of suicide-related outcomes. Thus, the combined effect of physical activity and PMH might be an effective way to reduce suicide ideation and suicide attempts. Following the advice of Lester et al. (2010) who emphasized the need for longitudinal research, the present study investigated this assumption using a longitudinal design – two measurement time points (baseline, BL, and follow-up, FU) with a three-year time interval in a sample of individuals who mainly belonged to the emerging adulthood in Germany. A confirmation of this assumption might reveal important knowledge for programs that focus on the reduction of suicide-related outcomes and the suicide rate.
We expected that suicide-related outcomes (FU) are negatively linked to physical activity (BL) (Hypothesis 1a) and PMH (BL) (Hypothesis 1b). We assumed that physical activity (BL) is positively related to PMH (BL) (Hypothesis 1c). Moreover, we expected that PMH (BL) negatively mediates the association between physical activity (BL) and suicide-related outcomes (FU) (Hypothesis 2).
Method
Participants
In October 2016, 250 randomly collected students of a large German university in the Ruhr region received an e-mail invitation to the first online survey (BL). In October 2019, the 237 persons who had completed the first survey, were invited by e-mail to complete the second online survey (FU). Participation was voluntary and compensated by course credits. In total, 223 persons (79.4%, n = 177 women; BL: Mage (SDage) = 22.85 (4.05); range: 18–40) completed both surveys. At BL, all participants were students. At FU, 30.5% (n = 68) had finished their studies and were working. The responsible Ethics Committees approved the conduction of the present study. Participants were properly instructed and gave online their informed consent to participate. The privacy rights of human subjects were fully observed.
Measures
Physical Activity
The item “How frequently do you engage in physical exercise (e.g., swimming, cycling, jogging)?” that is rated on a 5-point Likert scale (1 = never, 5 = four times a week or more) assessed frequency of physical activity. This item was previously reported to be a reliable and valid instrument to measure physical activity with a satisfying mean test-retest reliability ranging between rmtrr = .60 and .82 (Brailovskaia et al. 2020; Milton et al. 2011).
Positive Mental Health Scale (PMH-Scale; Lukat et al. 2016)
The unidimensional PMH-Scale measures subjective and psychological aspects of well-being. The nine items (e.g., “I enjoy my life”, “I feel that I am actually well equipped to deal with life and its difficulties”) are rated on a 4-point Likert scale (0 = do not agree, 3 = agree). Current internal reliability of the scale was: Cronbach’s αBL = .93.
Suicide-Related Outcomes
Item 1 (“Have you ever thought about or attempted to kill yourself?”) of the Suicidal Behaviors Questionnaire-Revised (SBQ-R; Osman et al. 2001) that is rated on a 6-point Likert scale (1 = never, 6 = I have attempted to kill myself, and really hoped to die) was included to assess lifetime suicide-related outcomes. This item was recommended for screening purpose and has repeatedly been used in clinical and non-clinical samples. A cutoff score of 2 in the SBQ-R Item 1 has been shown to be most useful in differentiating between suicidal and non-suicidal individuals (Osman et al. 2001).
Statistical Analyses
Statistical analyses were conducted with SPSS 24 and the macro Process version 2.16.1 (www.processmacro.org/index.html; Hayes 2013). After descriptive statistics and zero-order bivariate correlations, a mediation model (Process: model 4) was calculated with the basic relationship between physical activity (BL, predictor) and lifetime suicide-related outcomes (FU, outcome) (path c, total effect). The path of physical activity (BL) to PMH (BL, mediator) was denoted by a; the path of PMH (BL) to suicide-related outcomes (FU) was denoted by b. The indirect effect was represented by the combined effect of path a and path b. Path c’ denoted the direct effect of physical activity (BL) to suicide-related outcomes (FU) after the inclusion of PMH (BL) in the model. Age and gender (both BL, covariates) were included as control variables. The bootstrapping procedure (10.000 samples) that provides accelerated confidence intervals (95% CI) assessed the mediation effect. PM (the ration of indirect effect to total effect) served as mediation effect measure. A priori conducted power analyses (G*Power program, version 3.1) revealed that the current sample size was sufficient for valid results (power > .80, α = .05, effect size f2 = 0.15; Mayr et al. 2007).
Results
Of the 223 participants, 56% (n = 125) reported lifetime suicide ideation/behavior (SBQ-R > 0), 2.7% (n = 6) reported lifetime suicide attempts. Suicide-related outcomes (FU; M (SD) = 1.92 (1.10), range: 1–6) were significantly negatively correlated with physical activity (BL; M (SD) = 3.11 (1.18), range: 1–5), r = −.260, p < .001, and with PMH (BL; M (SD) = 18.40 (6.12), range: 0–27), r = −.469, p < .001. Physical activity (BL) was significantly positively correlated with PMH (BL), r = .394, p < .001.
Figure 1 shows the results of the bootstrapped mediation analysis. The basic relationship between physical activity (BL) and suicide-related outcomes (FU) was significant (total effect, c: p < .001). After the inclusion of PMH (BL) in the model, this relationship was no longer significant (direct effect, c’: p = .215). The link between physical activity (BL) and PMH (BL) (a: p < .001), and the association between PMH (BL) and suicide-related outcomes (FU) (b: p < .001) were both significant. The indirect effect (ab) was significant, b = −.144, SE = .040, 95% CI [−.237, −.079]; PM: b = .659, SE = .565, 95% CI [.375, 1.299].
Discussion
For individuals who belong to the emerging adulthood, suicide is the second leading cause of death worldwide (World Health Organization 2014); suicide rates increased remarkably in the last years especially for this age group (Twenge et al. 2018). Therefore, effective programs that contribute to the prevention of suicide ideation and suicide attempts are of great importance. The development of such programs depends on the available knowledge about the factors that can directly or in interaction with each other reduce the risk of suicide-related outcomes.
While some earlier studies described that engagement in physical activity can contribute to the reduction of suicide-related outcomes (e.g., Taliaferro et al. 2011; Vancampfort et al. 2018), other research did not confirm this finding (e.g., Choquet et al. 1993; Sabo et al. 2005). Therefore, Lester et al. (2010) emphasized the importance of the identification of potential mediators of the relationship between physical activity and suicide-related outcomes. Considering previous research (e.g., Schuch et al. 2016; Stubbs et al. 2017), it can be assumed that factors that belong to the negative dimension of mental health such as depression and anxiety symptoms may serve as mediators in this relationship. However, the role of the positive dimension of mental health remained so far unclear. The present longitudinal findings from an emerging adulthood sample contribute to the clarification of this issue. They reveal that PMH can reinforce the protective effect of physical activity.
As expected, physical activity and PMH were negatively related to suicide-related outcomes three years later (confirmation of Hypothesis 1a and Hypothesis 1b). Both were positively associated (confirmation of Hypothesis 1c). Moreover, PMH mediated the association between physical activity and suicide-related outcomes (confirmation of Hypothesis 2). The present findings complement previous studies showing that physical activity protects against suicide ideation and suicidal behavior (Vancampfort et al. 2018). Also, they replicate previous findings that PMH exerts a protective effect on suicide-related outcomes (e.g., Teismann et al. 2016). Moreover, they reveal that the combination of physical activity and PMH can reduce the risk of suicide-related outcomes over a three-year follow-up interval. Thus, based on current results, it can be assumed that the protective influence of physical activity against suicide-related outcomes is due to heightened PMH: If physical activity translates into PMH, i.e., life satisfaction, self-acceptance and self-efficacy, then suicide ideation and suicide attempts become less likely. This result-pattern might explain why physical activity is not always associated with suicide-related outcomes (e.g., Choquet et al. 1993); it depends on its influence on (positive) self-appraisals. This finding confirms and complements the assumption of Lester et al. (2010) considering the mediating role of mental health. Thus, the negative dimension and the positive dimension of mental health (Keyes 2005) are both involved in the association between physical activity and suicide-related outcomes.
The present study includes several strengths and limitations. A significant strength involves the three-year prospective design which offers advantages over previous cross-sectional research addressing physical activity and suicide-related outcomes. Moreover, the present study focuses on the combination of physical activity and PMH, while previous research mostly investigated negative mental health factors. However, several study limitations warrant recognition. First, the study does not include a rigorous physical activity assessment. Thus, it is neither possible to investigate whether different kinds of physical activity show a differential association with suicide-related outcomes, nor is it possible to differentiate between the effect of physical activity compared to the effect of sport participation – with the latter offering not only physical activity but also integration into social networks (cf., Taliaferro et al. 2011). Second, the single-item measure of suicide ideation/behavior might have lacked specificity. Multi-item measures would produce greater precision of measurement and possibly affect results. Third, the predominately female sample limits the generalizability of the current results. Fourth, researchers and practitioners should not overstate associations between physical activity and suicide-related outcomes, since the here-found effects are of a rather modest size.
Clinically, the findings of the current study suggest that it may be important to account both for the presence of physical activity and PMH in addition to risk factors, when assessing individuals at risk for suicide. Furthermore, it could be useful to incorporate participation in physical activity in suicide prevention programs. The engagement in physical activity can contribute to the experience of positive emotions and to the increase of the sense of control that individuals with enhanced suicide risk often miss. This can foster the PMH level which may reduce the suicide-related outcomes. Moreover, the enhancement of the individual PMH level by other interventions that enable positive experiences and the increase of self-efficacy can strengthen the protective combined effect of physical activity and PMH on suicide ideation and suicide attempts.
In summary, the present results indicate a protective association between physical activity and suicide-related outcomes over a three-year period and underscore the importance of PMH as a protective factor against suicide ideation and suicide attempts.
Change history
16 October 2021
A Correction to this paper has been published: https://doi.org/10.1007/s12144-021-02330-1
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Open Access funding enabled and organized by Projekt DEAL. The study was funded by the Alexander von Humboldt Professorship warded to Jürgen Margraf by the Alexander von Humboldt-Foundation.
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Brailovskaia, J., Teismann, T. & Margraf, J. Positive mental health mediates the relationship between physical activity and suicide-related outcomes: a three-year follow-up study. Curr Psychol 41, 6543–6548 (2022). https://doi.org/10.1007/s12144-020-01152-x
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DOI: https://doi.org/10.1007/s12144-020-01152-x