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The conceptualisation and measurement of the associations between narcissism and muscle dysmorphia (MD) are poorly understood in the literature. It is recognised that narcissism features two broad dimensions: vulnerable and grandiose. Studying both narcissism dimensions is important given their differences in etiology and health-related outcomes. Therefore, the aim of this study was to investigate the associations between MD, vulnerable and grandiose narcissism. A total of 336 participants (48% male; M age = 26.4 years) completed measures of MD and narcissism. Hierarchical regression analysis revealed that vulnerable narcissism was significantly, positively associated with MD, whilst grandiose narcissism was not. Practitioners should be aware that vulnerable narcissism may be a potential risk factor of MD. Clinical implications• Vulnerable narcissism was associated with muscle dysmorphia • Grandiose narcissism was not associated with muscle dysmorphia • Negative self-worth may explain some variance with muscle dysmorphia • Vulnerable narcissism may be a risk factor for muscle dysmorphia in men and womenMuscle dysmorphia (MD) is a clinical specifier for body dysmorphic disorder in the DSM-5 and is characterised by a pathological belief of being insufficiently muscular (American Psychiatric Association, 2013). This preoccupation with muscularity can cause significant impairment to daily functioning and an intolerance towards one's appearance (e.g., Hildebrandt et al., 2004). Common symptoms of MD include negative body image, high levels of anxiety and stress, and excessive and compulsive weight training (Sandgren & Lavallee, 2018). Consequently, these symptoms may result in behaviours with serious psychological and physiological health outcomes (e.g., anabolic steroids abuse; Rohman, 2009). Therefore, identifying risk factors of MD is

When given opportunities for personal glory in individual settings, people high in narcissism excel. However, less is known about narcissists’ influence in team contexts. Across two studies (utilizing cross-sectional and two-wave longitudinal designs) involving 706 athletes from 68 teams in total, we tested a conceptual model linking narcissism to task cohesion, via intragroup conflict, moderated by narcissistic group composition. We tested a new sports-oriented measure of intragroup conflict using Bayesian estimation and evaluated our theorizing using a multilevel conditional indirect effect hybrid model. Across both studies, we found that narcissism influenced perceptions of task cohesion via process conflict only, with a negative influence at low narcissistic group composition that was weakened (Study 1) or nullified (Study 2) at high narcissistic team composition. Collectively, these findings offer the first example of how narcissism influences task cohesion in team settings and the contextual effects of narcissistic group composition.

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