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FUNDING: National Research Foundation (South Africa), North-West University Up to 95% of a soccer match entails aerobic actions that may cause fatigue. Little is known about the effects of fatigue on the hormonal and psychological states of female players. Cortisol values (saliva sample), state anxiety (Spielberger State-trait Anxiety Inventory) and mood scores (Incredibly Short Profile of Mood States [ISP], comprising six subscales and total mood disturbances [TMD]) of 43 female players (aged 22.0±2.7 years) were taken immediately prior to and 15 min after an aerobic fatiguing test (AFT: Yo-Yo Intermittent Recovery [YYIR] test). Cortisol increased (d=0.7, p=0.007) and ISP–confusion and ISP–vigour decreased (d=0.5, p=0.01–0.02). At pre-AFT, a slight positive relationship between cortisol and anxiety-absence (r=0.3, p=0.05) was seen. TMD consistently demonstrated a strong relationship with all ISP and anxiety scores (r>0.4, p<0.01). Post-AFT results demonstrated a positive relationship between cortisol and blood lactate (r=0.3, p=0.04), between ISP–anger with maximal heart rate (r=0.3, p=0.03), ISP–anger and YYIR level as well as ISP–fatigue (r=0.4, p=0.04), and between perceived exertion rate and ISP–vigour (r=-0.4, p=0.008) as well as ISP–fatigue (r=0.3, p=0.05). Fatigue caused by prolonged activity may be a greater physiological than psychological stressor, although both may affect soccer performance. We recommend training players to increase their aerobic capacity to ensure maximal quality match-time before fatigue and its subsequent adverse physiological and psychological effects set in.

Psycho-hormonal effects of aerobic fatigue on collegiate female soccer players