Perceived stressThe Perceived Stress Scale (PSS; Cohen et al., 1983) was used to measure psychological stress. This scale measures self-appraised stress (e.g., “During the past month, how often have you felt that you were unable to control the important things in your life?”), and consists of ten items rated on a five-point Likert-type scale from 0 (never)to4 (very often). In this study, the 10-item version was used. The Swedish version has been validated using confirmatory factor analysis and been found to have acceptable internal consistency (a 0.84; Gustafsson et al., 2013). It has been successfully used in sport (Gustafsson et al., 2013). A sum score of the 10 items was computed as recommended by Cohen et al. (1983).