2.4. Assessment of Stress, Mood, Cognition, and Sleep
BRAIN
Cohen’s Perceived Stress Scale (PSS) was used to assess the subjective feelings of stress throughout the study [For the assessment of mood states, the short form of the Profile of Mood State (POMS) questionnaire was used [The Pittsburg Sleep Quality Index (PSQI) questionnaire assesses sleep quality over a one month period [The Competency Assessment (COMPASS) battery of different cognitive assessment tools was used to investigate cognitive performance before and after the intervention. COMPASS was developed by the Brain, Performance, and Nutrition Research Centre, Northumbria University, and is commercially available (