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00005768-200305001-0013100005768_2003_35_s26_webb_cardiorespiratory_5miscellaneous< 20_0_5_0 >Medicine & Science in Sports & Exercise©2003The American College of Sports MedicineVolume 35(5) Supplement 1May 2003p S26PSYCHOLOGICAL STRESS DURING EXERCISE: CARDIORESPIRATORY AND HORMONAL RESPONSES[A-15M FREE COMMUNICATION/POSTER EXERCISE: COGNITIVE FUNCTION AND STRESS]Webb, H E.1,2; Weldy, M L.1; Fabianke, E C.1; Orndorff, G R.1; Kamimori, G H. FACSM3; Acevedo, E O. FACSM11Division of Exercise Science, Washington, DC.2University of Mississippi, University, MS; Department of Pharmacology, Washington, DC.3University of Mississippi, University, MS; Walter Reed Army Research Institute, Washington, DCStress responses to physical and psychological challenges are regulated by hormones that are released following activation of the sympathoadrenal axis and the hypothalamo-pituitary-adrenocortical axis.PURPOSEThis study examined the cardiorespiratory responses of heart rate (HR), ventilation (VE), respiratory rate (RR), oxygen consumption (VO2), and respiratory exchange ratio (RER) and the hormonal responses of epinephrine (Epi), norepinephrine (NE) and cortisol (CORT) to psychological and physical stress combined.METHODSNine subjects participated in two exercise conditions. The treatment condition was a ride at 60% of VO2max while participating in a computerized psychological stressor (stress condition; SC), whereas in the control condition subjects rode at the same intensity without the psychological stressor (no stress condition; NSC). The NASA Task Load Index (NTLX) was used to assess perceived physical and psychological load during each condition. These sessions were counter-balanced between subjects.RESULTSRMANOVA's revealed significant interactions across time for cardiorespiratory responses (HR, VE, and RR) between the NSC and the SC. Epi AUC was not significantly different between the two conditions; however, NE AUC was significantly elevated in the SC. Furthermore, CORT AUC was also significantly elevated during the SC. NTLX scores demonstrated that the subjects perceived overall workload to be higher in the SC.CONCLUSIONThese results demonstrate that psychological stress during exercise can elicit a stress response including the release of hormones that have been linked to negative health consequences.PSYCHOLOGICAL STRESS DURING EXERCISE: CARDIORESPIRATORY AND HORMONAL RESPONSESWebb, H E.; Weldy, M L.; Fabianke, E C.; Orndorff, G R.; Kamimori, G H. FACSM; Acevedo, E O. FACSMA-15M Free Communication/Poster Exercise: Cognitive Function and Stress535