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Pediatr Exerc Sci ; 26(2): 159-67, 2014 May.
Article in English | MEDLINE | ID: mdl-24091353

ABSTRACT

To investigate the association between pregame snacks varying in macronutrient content and exercise intensity, physiological stress, and fatigue in young soccer players. One hour before a 50-min soccer game, children (n = 79; 9.1 ± 0.8 y) were randomly assigned to consume a raisin-, peanut-butter-, or cereal-based snack. Body mass index, blood glucose, and salivary measures of stress (cortisol and immunoglobulin A-IgA) were measured pre- and post-game. Exercise intensity was measured by accelerometry. Self-administered questionnaires were used to assess diet quality and fatigue. Analysis of covariance was used to examine the relationship between pregame snacks and biochemical outcomes. Postgame glucose and cortisol increased [12.9 ± 21.3 mg/dL (p < .001) and 0.04 ± 0.10 µg/dL (p < .05), respectively] and IgA decreased (-2.3 ± 9.6 µg/mL; p < .001) from pregame values. The pregame snack was not associated with exercise intensity or post-game outcome; however, children consuming the cereal-based (high-sugar and high-glycemic index (GI)) snack exercised more intensely than the 2 lower-GI snack groups (p < .05). Children who consumed the high-sugar, high-GI snack also reported more symptoms of fatigue (p < .05). A high-sugar, high-GI pregame snack was associated with exercise intensity and fatigue but not changes in blood sugar or stress biomarkers following a soccer game in children.


Subject(s)
Exercise/physiology , Fatigue/physiopathology , Snacks/physiology , Soccer/physiology , Stress, Physiological , Accelerometry , Biomarkers/blood , Child , Diet Surveys , Fatigue/blood , Female , Humans , Male , Surveys and Questionnaires
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