Interrelationships between stress, eating attitudes, and metabolism in endurance athletes across a competitive season.

A competitive sport season represents a multidimensional stressor where physical and psychological stress may render an athlete susceptible to energy deficiency (ED). Downstream effects of ED can include a reduction in measured-to-predicted resting metabolic rate (RMR _ratio ), indicating metabolic compensation. A pathway linking stress, eating attitudes, and metabolic compensation has not been explored. To test if sport-specific stress is associated with eating attitudes and metabolism in endurance athletes (18-22 years) at different phases of a competitive season, we assessed two groups of athletes: 26 swimmers (15 female and 11 male) during peak season (PEAK), and 26 runners (female) across pre- (PRE) and off-season (OFF). Stress (RESTQ-52), eating attitudes (cognitive restraint (CR), drive for muscularity (DM), and body dissatisfaction), and metabolism (RMR _ratio ) were assessed. In PRE, sport-specific stress and CR were negatively correlated with RMR _ratio ( R = -0.58; p  < 0.05, and R = -0.57; p  < 0.05, respectively). In PEAK, sport-specific stress and DM were negatively correlated with RMR _ratio ( R = -0.64; p  < 0.05; R = -0.40; p  < 0.05, respectively). DM was positively related to sport-specific stress ( R  = 0.55; p  < 0.05). During OFF, there was no relation between RMR _ratio and sport-specific stress. In runners, there was a change in stress from PRE-to-OFF with highest reported stress during PRE ( p  < 0.05) versus OFF. Regression analyses revealed that sport-specific stress and CR were significant predictors of RMR _ratio during PRE and PEAK ( p  < 0.05), but not OFF ( p  > 0.05). Associations between stress, eating attitudes, and metabolic compensation in endurance athletes during PRE and PEAK season suggest that during heavier training, metabolic compensation may be linked to upstream eating attitudes associated with sport-stressors.
Competing Interests: The authors declare there are no competing interests.