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Abstract: Perceived Exertion in Fatiguing Illness: Gulf War Veterans with Chronic Fatigue Syndrome

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www.ProHealth.com • April 4, 2003


Med Sci Sports Exerc 2003 Apr;35(4):569-574

Cook DB, Nagelkirk PR, Peckerman A, Poluri A, Lamanca JJ, Natelson BH.

1)Center for the Study of War-Related Illnesses, VA NJ Health Care, East Orange, NJ; 2)Chronic Fatigue Syndrome Cooperative Research Center, University of Medicine and Dentistry of New Jersey - New Jersey Medical School, Newark, NJ; and.

COOK, D. B., P. R. NAGELKIRK, A. PECKERMAN, A. POLURI, J. J. LAMANCA, and B. H. NATELSON. Perceived Exertion in Fatiguing Illness: Gulf War Veterans with Chronic Fatigue Syndrome. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 569-574, 2003.

PURPOSE: It has been reported that ratings of perceived exertion (RPE) are elevated in chronic fatigue syndrome (CFS). We have challenged this notion by examining perceived exertion in civilian females with CFS and expressing the data relative to exercise capacity (%[OV0312]O(2max)). The purpose of the present investigation was to further examine RPE during exercise in a unique population of CFS patients, Gulf veterans (GV).

METHODS: Thirty-four GV (N = 15 CFS, 42 +/- 8 yr; N = 19 healthy, 43 +/- 5 yr) performed a maximal exercise test on a cycle ergometer. After a 3-min warm-up, exercise intensity increased by 30 W every minute until exhaustion. RPE were obtained during the last 15 s of each minute using Borg's CR-10 scale.

RESULTS: With the exception of peak [OV0312]E, there were no significant differences in any peak exercise variables. Repeated measures ANOVA revealed significantly higher RPE at each power output examined (F(1,32) = 16.4, P < 0.001). Group differences in RPE remained significant when analyzed relative to peak [OV0312]O(2) (F(1,32) = 7.2, P = 0.01). Both group main effects and the interaction were eliminated when self-reported fatigue symptoms were controlled for in the analyses. Power functions for RPE as a function of relative oxygen consumption were not different between groups and were significantly greater than a linear value of 1.0 (1.6 +/- 0.3 for both groups, P < 0.02).

CONCLUSIONS: Our results show that RPE are greater in GV with CFS regardless of whether the data were expressed in terms of absolute or relative exercise intensity. However, self-reported fatigue associated with CFS eliminated the group differences. These results suggest that GV with CFS were unique compared with their civilian counterparts. Future research aimed at determining the influence of preexisting fatigue on RPE during exercise is warranted.

PMID: 12673138 [PubMed - as supplied by publisher]




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