Abstract
Objectives
To present an overview of the existing epidemiological evidence regarding the occurrence of mental health symptoms and disorders among current and former elite athletes.
Design
Systematic review and meta-analysis.
Data sources
Five electronic databases were searched from inception to November 2018: PubMed (MEDLINE), SportDiscus via EBSCO, PSycINFO via ProQuest, Scopus and Cochrane.
Eligibility criteria for selecting studies
We included original quantitative studies that were written in English, were conducted exclusively among current or former elite athletes, and presented incidence or prevalence rates of symptoms of mental disorders.
Results
Twenty-two relevant original studies about mental health symptoms and disorders among current elite athletes were included: they presented data especially on symptoms of distress, sleep disturbance, anxiety/depression and alcohol misuse. Meta-analyses comprising 2895 to 5555 current elite athletes showed that the prevalence of mental health symptoms and disorders ranged from 19% for alcohol misuse to 34% for anxiety/depression. Fifteen relevant original studies about mental health symptoms and disorders among former elite athletes were included: they similarly presented data especially about symptoms of distress, sleep disturbance, anxiety/depression and alcohol misuse. Meta-analyses comprising 1579 to 1686 former elite athletes showed that the prevalence of mental health symptoms and disorders ranged from 16% for distress to 26% for anxiety/depression.
Conclusions
Our meta-analyses showed that the prevalence of mental health symptoms and disorders ranged from 19% for alcohol misuse to 34% for anxiety/depression for current elite athletes, and from 16% for distress to 26% for anxiety/depression for former elite athletes.
Keywords: anxiety, depression, mental, sleep
Introduction
Mental health symptoms and disorders (eg, those involving distress, anxiety, depression or substance misuse) are more frequently reported in young adult populations than in other age groups.1–3 A recent systematic review and meta-analysis showed that one out of five adults experienced a mental health disorder within the past 12 months and almost one out of three across their lifetime.4 In the past decade, mental health symptoms and disorders have been increasingly under study in elite athletes. Single studies show that the prevalence of mental health symptoms and disorders among both current and former elite athletes seems substantial and similar to the prevalence in the general population.5 A professional or elite sport career is characterised by more than 640 distinct stressors that could induce mental health symptoms and disorders.6 Furthermore, transitioning out of sport can be a difficult period for athletes with an increased likelihood of developing mental health symptoms and disorders.6 7 At the present time, an overview of the available scientific evidence about the extent of mental health symptoms and disorders in elite athletes is lacking. Therefore, we aimed to review the existing epidemiological evidence regarding the occurrence of mental health symptoms and disorders among current and former elite athletes.
Methods
A systematic review of the scientific literature was conducted in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.8
Data sources and search strategy
Five electronic databases were searched from inception to November 2018: PubMed (MEDLINE), SportDiscus via EBSCO, PSycINFO via ProQuest, Scopus and Cochrane. We applied the following filters (if applicable): Humans; English. A highly sensitive search strategy (included in Appendix 1) was built based on two groups of keywords (and related search terms): ‘mental health disorders’ and ‘elite athletes’. Within each keyword, all search terms were combined by the Boolean command OR, and the keywords (and respective search terms) were linked by the Boolean command AND. Existing medical subject headings (MeSH) were used if possible, and search terms were truncated with *.
bjsports-2019-100671supp001.docx (30.2KB, docx)
Eligibility criteria and study selection
Eligibility criteria for inclusion were:
The study population consists exclusively of current or former elite athletes (defined as professional or Olympic athletes).
The study outcome is presented as incidence or prevalence of mental health symptoms and disorders.
The article presents an original quantitative study.
The article is written in English.
To identify potentially relevant articles, titles and abstracts were screened independently by two researchers (VG, GK) using the eligibility criteria. If the title and abstract did not provide sufficient information to determine whether the eligibility criteria were met, it was included for full text review. Then, all full text articles were assessed independently by two researchers (VG, GK) using the eligibility criteria. To avoid missing any relevant publications, the references of the included studies were screened. Any disagreements regarding the inclusion or exclusion of articles were resolved by consulting a third researcher (CR).
Data extraction
Data from the included articles were extracted and crosschecked by two authors (JMC-M, SR). Two standardised extraction forms were used (one for current elite athletes and one for former elite athletes) in order to report the following: study information (author, year); study population (eg, sample size, age, gender, height, weight, country, type and level of sport, duration of sport career, time since retirement); study design and related information (follow-up, response rate, loss to follow-up); definition and assessment of mental health symptoms and disorders; and outcome expressed as incidence or prevalence.
Risk of bias
To describe the risk of bias of the included studies, a 9-item tool for prevalence studies was used (included in Appendix 2).9 Each of the nine potential bias domains was rated as low (0) or high (1) risk of bias.9 Based on the total score, a study was rated as follows: low risk of bias with score of 0 to 3; moderate risk of bias with score of 4 to 6; and high risk of bias with score of 7 to 9.9 The risk of bias of all included articles was assessed by two authors (VG, GK), with any discrepancies resolved through consensus among the authors.
Meta-analysis
All statistical analyses were conducted separately for current and former elite athletes in OpenMetaAnalyst.10 Random-effects models were applied to all meta-analyses to account for heterogeneity. The random-effects method was chosen because of its conservative summary estimate and because it incorporates between- and within-study variance.11 Pooled estimates with 95% confidence intervals (CI) were calculated for the prevalence of mental health symptoms and disorders. Variance between studies was assessed using Cochran’s Q and reported as ^2. Visual inspection of funnel plots assessed the degree of potential publication bias.
Results
Search strategy
A total of 1659 potentially relevant citations were retrieved. After removing 751 duplicates, 908 citations remained. After applying the inclusion criteria to the titles and abstracts, 85 potentially relevant studies were included for full text review. From these, 54 studies were excluded for various reasons (not in English: n=1; not an original study: n=5; not including only current or former elite athletes: n=22; not presenting an adequate outcome measure: n=26). The reference check of the included studies resulted in three additional relevant studies.12–14 Consequently, our systematic review includes 34 original studies: 18 including exclusively current elite athletes,12 13 15–30 11 including exclusively former elite athletes31–41 and four including both current and former elite athletes.14 42–44 The PRISMA flow chart of the search procedure is presented as figure 1.
Risk of bias
Thirty-three of the 34 original studies included in our systematic review had an overall low risk of bias, and one study had a moderate risk of bias (included in Appendix 3).
Mental health symptoms and disorders among current elite athletes
Twenty-two studies reporting mental health symptoms and disorders among current elite athletes were included, presenting data (mostly prevalence) most commonly for symptoms of distress, sleep disturbance, anxiety/depression and alcohol misuse (included in online supplementary appendix 4).12–30 42–44 Among those, 11 studies reported prevalence data on distress symptoms among 3335 male and female elite athletes (age ranging from 16 to 29 years) from team sports (eg, cricket, football, handball, ice hockey, rugby) and combined Olympic sports (eg, boxing, gymnastics, judo, rowing, swimming).12–14 16 19 21 23 25 42–44 Based on our meta-analysis, we found that 19.6% (95%CI: 16.0 to 23.3) of elite athletes reported symptoms of distress (high between-study heterogeneity: Q=77.1, P<0.001, ^2=85.7%). Ten studies reported prevalence data on symptoms of sleep disturbance among 4782 elite athletes from various sports:12–16 21 23 29 43 44 meta-analysis revealed that 26.4% (95%CI: 21.6 to 31.2) of elite athletes reported symptoms of sleep disturbance (high between-study heterogeneity: Q=133.651, P<0.001, ^2=92.518%). Nine studies reported prevalence data on symptoms of anxiety/depression (not differentiated) among 2895 elite athletes from various sports:12–14 19 21 23 42–44 meta-analysis showed that 33.6% (95%CI: 27.4 to 39.7) of elite athletes reported symptoms of anxiety/depression (high between-study heterogeneity: Q=109.737, P<0.001, ^2=91.799%). Eleven studies reported prevalence data on symptoms of alcohol misuse among 5555 elite athletes from various sports:12–14 17 21 23 26 29 42–44 meta-analysis revealed that 18.8% (95%CI: 11.1 to 26.5) of elite athletes reported symptoms of alcohol misuse (high between-study heterogeneity: Q=910.896, P<0.001, ^2=98.792%). All meta-analyses and pooled estimates for data in current elite athletes are presented in figure 2. Other cross-sectional studies presented data for eating disorders or adverse eating habits (n=7; 1%–28%),18 20 23 25 27 29 30 for panic disorder (n=2; 1%–5%)25 29 and for gambling (n=1; 2%–7%).26 Only six prospective cohort studies were retrieved from the literature, showing incidence (new cases over 6–12 months) from 6% for symptoms of alcohol misuse to 57% for symptoms of anxiety/depression.13 14 21 22 24 43 One single study was conducted solely in female elite athletes (distance runners), showing a prevalence of eating disorders from 1% for bulimia nervosa to 4% for anorexia nervosa.27
bjsports-2019-100671supp002.pdf (122.5KB, pdf)
Mental health symptoms and disorders among former elite athletes
Fifteen studies reporting mental health symptoms and disorders among former elite athletes were included, presenting data (mostly prevalence) most commonly for symptoms of distress, sleep disturbance, anxiety/depression and alcohol misuse (included in online supplementary appendix 5).14 31–44 Among those, eight studies reported prevalence data on distress symptoms among 1686 former male and female elite athletes (age ranging from 34 to 62 years) from team sports (American Football, cricket, football, ice hockey, rugby) and combined Olympic sports.14 31 33–35 42–44 Meta-analysis demonstrated that 15.8% (95%CI: 16.0 to 23.3) of former athletes reported symptoms of distress (high between-study heterogeneity: Q=55.502, P<0.001, ^2=85.586%). Seven studies reported prevalence data on symptoms of sleep disturbance among 1579 former elite athletes from various sports,14 31 33–35 43 44 and meta-analysis showed that 20.9% (95%CI: 15.2 to 26.6) of former athletes reported symptoms of sleep disturbance (high between-study heterogeneity: Q=57.432, P<0.001, ^2=87.812%). Eight studies reported prevalence data on symptoms of anxiety/depression (not differentiated) among 1662 former elite athletes from various sports,14 31 33–35 42–44 with meta-analysis demonstrating that 26.4% (95%CI: 21.4 to 31.4) of former athletes reported symptoms of anxiety/depression (high between-study heterogeneity: Q=43.320, P<0.001, ^2=81.533%). Eight studies reported prevalence data on symptoms of alcohol misuse among 1636 former athletes from various sports:14 31 33–35 42–44 meta-analysis revealed that 21.1% (95%CI: 14.7 to 27.4) of former athletes reported symptoms of alcohol misuse (high between-study heterogeneity: Q=93.395, P<0.001, ^2=91.434%). All meta-analyses and pooled estimates for data in former elite athletes are presented in figure 3. Other cross-sectional studies presented data for eating disorders (n=2; 24%–27%),35 43 for dementia (n=1; 6%),36 for Alzheimer’s disease (n=1; 12%)36 and for mild cognitive impairment (n=1; 23%).36 Only five prospective cohort studies were retrieved from the literature, showing incidence (new cases over 6–12 months) from 0% for symptoms of distress and anxiety/depression to 42% for symptoms of depression.14 31 37 40 43
Discussion
We reviewed the existing epidemiological evidence regarding the occurrence of mental health symptoms and disorders among current and former elite athletes. Our search strategies and study selection retrieved 34 original studies, 33 of which had an overall low risk of bias. Among both current and former elite athletes, specific data about symptoms of distress, sleep disturbance, anxiety/depression and alcohol misuse were presented. Our meta-analyses showed that the prevalence of mental health symptoms and disorders ranged from 19% for alcohol misuse to 34% for anxiety/depression for current elite athletes, and from 16% for distress to 26% for anxiety/depression for former elite athletes.
The number of epidemiologic studies addressing mental health symptoms and disorders among current and former elite athletes has been increasing: 32 of the 34 studies included in our review were published after 2010. Relying primarily on self-reported cross-sectional data (and thus not on clinically diagnosed data), these studies and related meta-analyses suggest that the prevalence of symptoms of distress, sleep disturbance and anxiety/depression is higher in current athletes than in former athletes. This might be explained because during their sport career, elite athletes are exposed to generic factors such as adverse life events but also to sport-specific stressors.6 45 For instance, a greater overall risk of mental health symptoms and disorders might be experienced by elite athletes with severe musculoskeletal injuries, multiple surgeries, decreased sport performance or maladaptive perfectionism.24 43 46–50 Prevalence of alcohol misuse calculated in our meta-analyses was similar among current and former elite athletes, namely 19% vs 21%, respectively. This is surprising because our expectation was that alcohol misuse would be less prevalent in current athletes than in former athletes, as it would be expected to negatively impact performance and recovery. A potential explanation for this similar prevalence of alcohol misuse in current and former elite athletes might be that substantial alcohol use might be normative in some sports contexts (eg, binge pattern of use during the off-season), while alcohol misuse in former elite athletes might be the consequence of transitioning distress, lack of meaningful substitute activities or 'self-treatment' of enduring physical complaints related to prior injuries. Higher values of sleep disturbance prevalence were found in current elite athletes when compared with former elite athletes (26% vs 21%, respectively), and is likely to impair performances and recovery. Pre-competition stress, night-time sports events, early morning training and travel can contribute to these high values.15 16
Our systematic review and related meta-analyses suggest that the prevalence of mental health symptoms and disorders in current and former elite athletes (16%–34%) may be slightly higher than in the general population. However, it remains difficult to compare the substantial prevalence found in these current and former elite athletes because of the absence of reference groups from the general population in all studies included in our meta-analyses. A recent systematic review and meta-analysis study performed across 155 general populations in 59 countries indicated that 20% experienced a mental disorder within a 12-month period.4 In other studies, prevalence of anxiety/depression was found to range from 13% to 19% in Australia (general population), from 17% to 21% in Denmark (general practice population) and from 17% to 25% in the Netherlands (general and clinical practice populations of young male employees), which is lower than our meta-analyses showed among both current (34%) and former (26%) elite athletes.2 51–53 Despite these figures, accurate comparison is difficult to make because the outcomes related to mental health symptoms and disorders were not measured using the same scales from one study to another. The slightly higher prevalence of mental health symptoms and disorders in current and former elite athletes than in the general population might be related to the sport-specific stressors likely to affect athletes during their career.6 Furthermore, the period of transitioning out of elite sport can be challenging for athletes.7 Involuntary retirement from sport, for instance as a consequence of an injury, as well as high levels of athletic identity, lack of retirement planning, lower educational attainment, post-sport unemployment and chronic pain, are all risk factors for post-career mental health symptoms and disorders.31 32 35 38 40 43 54–57 Though the causal relationship remains unknown, the association between career-related concussions and post-sport mental health symptoms and disorders has been established in several studies among former elite athletes.36 37 58–60
Despite the increasing number of scientific studies about mental health symptoms and disorders in elite sports, the authors believe that raising awareness about and prioritisation of mental health symptoms and disorders in elite sports should be undertaken by international and national stakeholders and federations. This is essential as the context of elite sports continues to struggle against the stigma associated with mental health symptoms and disorders. With regard to athlete support, as mental health symptoms and disorders are common in elite sports, availability of interdisciplinary medical care and support for elite athletes should be a minimum standard. To that end, sports medicine clinicians and licensed mental health professionals have a significant role to play in order to ensure timely diagnosis and provide elite athletes with appropriate management. Early diagnosis and proper treatment should serve to optimise sport performance and quality-of-life. Mental health symptoms and disorders in former elite athletes must also be addressed. After career consultation, as recently introduced in professional football as an ‘exit health examination’ focusing, among other issues, on the mental health of retired players, is an important concept.61 62 Such an intervention was positively evaluated during a pilot study and should be made available for transitioning elite athletes, especially those experiencing involuntary sport retirement.62 Additionally, a thorough preparation for post-sport life could prevent the occurrence of mental health symptoms and disorders among former athletes, for instance through education programmes/seminars, practical resource centres, and mental and life skills training for career transition.55
The main limitations of the studies included in our systematic review are that most relied primarily on a cross-sectional design and on self-reported data, while mental health symptoms and disorders were assessed with different scales not specifically developed and validated for the population of elite athletes. Longitudinal studies based on a prospective cohort design should be conducted over several years in order to explore the course of mental health symptoms and disorders in elite sports, and assess causal relationships between potential risk factors and outcome measures. The studies included in our meta-analyses focus on self-report mental health symptoms, but we strongly suggest that future studies also focus on clinical mental health disorders. Mental health disorders are typically defined as conditions causing clinically significant distress or impairment that meet certain diagnostic criteria, such as in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) or International Classification of Diseases (ICD),63 64 whereas mental health symptoms are more common, may be significant, but do not occur in a pattern meeting specific diagnostic criteria and do not necessarily cause significant distress or functional impairment. The scales used in the included studies to measure mental health symptoms were generally different across studies. Additionally, studies largely focused on male elite athletes from team sports. Consequently, it is difficult to make valid comparisons across sports (eg, individual vs team sports), countries and culture (eg, Asian vs African athletes), genders and other demographic variables. This should be considered for future studies, with particular attention to enrolling female elite athletes (both during and after their career) as study populations. Furthermore, those scales used in the included studies were originally developed and validated in populations other than elite athletes. Therefore, further research should focus on the development of reliable and valid screening instruments for the specific population of elite athletes.
Conclusion
Our meta-analyses showed that the prevalence of mental health symptoms and disorders ranged from 19% for alcohol misuse to 34% for anxiety/depression for current elite athletes, and from 16% for distress to 26% for anxiety/depression for former elite athletes. This justifies a minimum standard of care that provides elite athletes with access to interdisciplinary treatment teams who can make timely mental health diagnoses and implement management strategies that are amenable to this specific population. For former elite athletes, thorough preparation for post-sport life is strongly suggested, and an ‘exit health examination’ could be beneficial.
What we already know?
An elite sport career is characterised by more than 640 distinct stressors that could induce mental health symptoms and disorders.
Transitioning out of sport can be a difficult period for athletes, with an increased likelihood of developing mental health symptoms and disorders.
Mental health symptoms and disorders seem prevalent in current and former elite athletes.
What are the new findings?
The prevalence of mental health symptoms and disorders in current elite athletes ranges from 19% for alcohol misuse to 34% for anxiety/depression.
The prevalence of mental health symptoms and disorders in former elite athletes ranges from 16% for distress to 26% for anxiety/depression.
The prevalence of mental health symptoms and disorders in current and former elite athletes may be slightly higher than in the general population, but it remains difficult to make valid comparisons.
Acknowledgments
The authors thank the other participants in the 2018 International Olympic Committee Consensus Meeting on Mental Health in Elite Athletes, including Cindy Miller Aron, David Baron, Antonia Baum, Abhinav Bindra, Richard Budgett, Niccolo Campriani, Alan Currie, Jeff Derevensky, Lars Engebretsen, Ira Glick, Michael Grandner, Doug Hyun Han, David McDuff, Margo Mountjoy, Aslihan Polat, Rosemary Purcell, Margot Putukian, Allen Sills, Torbjorn Soligard, Todd Stull, Leslie Swartz and Li Jing Zhu, for their input on the development and interpretation of this research.
Footnotes
Contributors: VG designed the study, reviewed identified papers and selected those matching inclusion criteria, coordinated the data extraction, assessed risk of bias, assisted in performing statistical analyses, edited and critically reviewed the manuscript, and approved the final version of the manuscript. JMC-M designed the study, performed the data extraction, edited and critically reviewed the manuscript, and approved the final version of the manuscript. PG designed the study, performed statistical analyses, edited and critically reviewed the manuscript, and approved the final version of the manuscript. BH designed the study, edited and critically reviewed the manuscript, and approved the final version of the manuscript. MH performed the literature searches, edited and critically reviewed the manuscript, and approved the final version of the manuscript. GK designed the study, reviewed identified manuscripts and selected those matching inclusion criteria, assessed risk of bias, edited and critically reviewed the manuscript, and approved the final version of the manuscript. SR designed the study, performed the data extraction, edited and critically reviewed the manuscript, and approved the final version of the manuscript. CR designed the study, edited and critically reviewed the manuscript, and approved the final version of the manuscript.
Funding: The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests: None declared.
Patient consent for publication: Not required.
Provenance and peer review: Not commissioned; externally peer reviewed.
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