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This study examined associations between anxiety, stress, and resting metabolic rate (RMR). Thirty women and 23 men had RMR measured at two visits. Participants also had body composition assessed and completed several questionnaires: State-Trait Inventory for Cognitive and Somatic Anxiety (STICSA), Anxiety Sensitivity Index (ASI)-3, and Perceived Stress Scale (PSS)-14. The state version of the STICSA was completed at both visits, while other questionnaires were completed at visit one. RMR was expressed in kcal/day and relative to lean mass (RMRrelative). Participants were divided into low, medium, and high anxiety groups based on STICSA trait scores, and RMR was compared among groups using one-way ANOVA. Changes between visits were evaluated using paired t-tests and Wilcoxon signed-rank tests. RMR did not change from visit one to two (1,589 to 1,586 kcal/day, p = 0.86) even though STICSA state scores slightly declined (Z-statistic = -2.39, p = 0.017). RMRrelative values were 30.3 ± 3.7, 29.0 ± 1.9, and 29.9 ± 3.6 kcal/kg of lean mass among low, medium, and high trait anxiety groups, respectively (F = 0.70, p = 0.50). No RMR variable significantly correlated with PSS-14, ASI-3, or STICSA scores. This study provides evidence that trait anxiety and life stress do not impact RMR. Whether an association between these factors exists in anxiety disorders remains to be evaluated. Novelty • Contrary to previous research, this study found no associations between anxiety and RMR • It's doubtful whether practitioners need to account for healthy subjects' trait anxiety and stress when analyzing RMR data.
This article was published in the following journal.
Name: Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme
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