Background: Mental training intends to support athletes in mastering challenges in sport. The aim of our study was to investigate the differential and shared effects of psychological skills training and mindfulness training on psychological variables relevant to athletic performance (e.g., handling emotions or attention control). We assumed that each approach has its own strengths (e.g., mindfulness has a differential effect on the acceptance of emotions), but for some goals (e.g., attention control), both training forms are expected to be equally successful (i.e., shared effects). Methods: A total of 95 athletes (M_age = 24.43, SD_age = 5.15; 49% female) were randomly assigned into three groups: psychological skills training intervention (PST), mindfulness training intervention (MT), and wait-list control group (WL). Participants completed a questionnaire battery before and after the training (pretest and posttest). We assessed mindfulness, use of mental strategies, handling of emotions, attention in training and competition, as well as the dealing with failure. The two intervention programs each consisted of four 90-min group workshops conducted over a period of 4 weeks. Results: Both interventions passed the manipulation check, that is, PST led to more mental strategies being used (probabilities > 95%), and MT led to an increase in two of three aspects of mindfulness (probabilities > 98%) when compared to WL. Compared to WL, both interventions equally improved in the ability to not let emotions interfere with performance (probabilities > 99%) and in controlling attention in training and competition (probabilities > 89%). To a lesser extend, both interventions showed shared improvements in dealing with failure indicated by more action orientation (probabilities > 82%). We found a differential effect of MT on decreased experiential avoidance: MT decreased compared to WL and PST (probabilities > 92%), whereas PST did not differ from WL. Conclusion: We conclude that both forms of mental training lead to improvements in performance-relevant psychological factors, especially concerning the handling of emotions and attention control. The results of our study suggest that different paths may lead to the desired outcomes, and accordingly, both forms of mental training seem justified. Trial registration number: ISRCTN11147748, date of registration: July 11, 2016.

Sport is a domain that is rife with loss, failures, and disappointment. Self-compassion – the recognition of one’s own suffering and a desire to alleviate it – offers protection against maladaptive psychological experiences in sport. The purpose of this scoping review was to update and expand the results of the review by Röthlin and colleagues ([2019]. Go soft or go home? A scoping review of empirical studies on the role of self-compassion in the competitive sport setting. Current Issues in Sport Science, 4, Article 013. https://doi.org/10.15203/CISS_2019.013), and to identify new themes to help guide future research. Sixty-nine publications were identified using a variety of search strategies. Quantitative research (62.3%) and cross-sectional designs (83.3%) were most common, and most research was conducted by researchers residing in Westernized countries (81.2%). The majority of study participants (n = 10,025) were collegiate athletes (42.1%), and female/women sport participants were sampled slightly more frequently (52.4%). Researchers often investigated sex- or gender-based and competition level differences in self-compassion scores. Other common areas of research focus included well-being, mindfulness, striving for excellence, overcoming setbacks, negative thoughts and emotions, and self-criticism. New research areas that were identified included a need for theory, additional efforts towards conceptualization and measurement, acknowledgement of participant selection bias, integrating intersectionality, the relationship between self-compassion and performance, the distinctiveness between self-compassion and mindfulness, and future directions for interventions.

Struggling to deliver performance in competitions is one of the main reasons why athletes seek the advice of sport psychologists. Psychologists apply a variety of intervention techniques, many of which are not evidence-based. Evidence-based techniques promote quality management and could help athletes, for example, to increase and maintain functional athletic behavior in competitions/games (i.e., being focused on task relevant cues and executing movements and actions in high quality). However, well-designed trials investigating the effectiveness of sport psychological interventions for performance enhancement are scarce. The planed study is founded by the Swiss National Science Foundation and examines the effectiveness of two interventions with elite and sub-elite athletes. A psychological skills training (PST) and a mindfulness-based intervention (MI), administered as group-program, will be compared to a waiting-list control group concerning how they enhance functional athletic behavior - which is a prerequisite for optimal performance. Furthermore, we will investigate underlying mechanisms (mediators) and moderators (e.g., task difficulty, individual characteristics, intervention-expectancy and intervention-integrity). The presented trial uses a randomized controlled design with three groups, comparing PST, MI and a waiting list control condition. Both group interventions will last 5 weeks, consist of four 2 h sessions and will be administered by a trained sport psychologist. Primary outcome is functional athletic behavior assessed using ambulatory assessment in a competition/game. As secondary outcomes competition anxiety, cognitive interference and negative outcome expectations will be assessed. Assessments are held at pre- and post-intervention as well as at 2 months follow up. The study has been approved by the ethical committee of the Swiss Federal Institute of Sport. Both PST and MI are expected to help improve functional behavior in athletes. By examining potential mechanisms of change and moderators of outcome we will not only be able to answer the question whether the interventions work, but also how, under what conditions, and for whom. This study may also fill a gap in sport psychology research, considering the current lack of randomized controlled trials. In the future, researchers could use the presented study protocol as template to investigate similar topics in sport psychology. ISRCTN11147748 , date of registration: 11 July 2016.

Self-compassion describes a supportive attitude towards oneself. Research outside the sport context suggests that self-compassion might be beneficial in terms of psychological processes that are helpful for athletic performance. At the same time, there are reasons to assume that athletes may fear a negative influence of SC on their self-improvement motivation. Therefore, it seemed worthwhile to clarify the role of self-compassion in the competitive sport setting by reviewing the current research. A literature search was conducted using PsycINFO, PsycARTICLES, PSYNDEX, and SPORTDiscus. Eligibility criteria were peer-reviewed publication, publication in English, original research and research investigating self-compassion in competitive athletes. From 17 publications that met the inclusion criteria, we identified 19 studies, most of which were quantitative, employing a cross-sectional design. Additionally, we found only one intervention study, one experimental study and four qualitative studies using interviews. We provided an integrative narrative description of the study aims, hypotheses, methodological characteristics and study results. Based on the reviewed findings we concluded that future research should relate their research question more often to existing theoretical models and that more intervention and longitudinal studies are needed. Thus far, qualitative studies highlight the potential ambivalence of athletes towards SC. Quantitative research indicates that SC is beneficial for athletes’ well-being and their ability to deal with adversities in sports, whereas the role of self-compassion for self-improvement motivation remains unclear.

In counseling settings we need short and understandable, as well as valid and reliable, questionnaires. However, test construction focuses primarily on the latter, resulting in rather long tests and athletes' perception of low return on time investment. We address this problem by explaining how questionnaires can be shortened (i.e., using three selection criteria) and validated (e.g., by calculating interitem correlations). As an example we shortened the Thought Occurrence Questionnaire Sport from 17 to three items. We argue why this short version still satisfies quality criteria and why such short(ened) questionnaires should be more appreciated (e.g., by publishing and using them in counseling settings).