A 2-day cardiopulmonary exercise test in chronic fatigue syndrome patients who were exposed to humidifier disinfectants

Jong-Han Leem; Hyoung-Eun Jeon; Hun Nam; Hwan-Cheol Kim; Kyung-Lim Joa

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자료유형: 학술저널

저자정보: Jong-Han Leem (Inha University) Hyoung-Eun Jeon (Inha University) Hun Nam (Inha University) Hwan-Cheol Kim (Inha University) Kyung-Lim Joa (Inha University)

저널정보: 환경독성보건학회 Environmental Analysis Health and Toxicology Environmental Analysis Health and Toxicology Vol.37 No.4

발행연도: 2022.12

수록면: 72 - 78 (7page)

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Some survivors of humidifier disinfectants (HDs) complain of chronic, inexplicable fatigue, and post-exertional malaise (PEM). Two-day cardiopulmonary exercise tests (CPETs) performed 24 hours apart (2-day CPET protocol) are increasingly employed to evaluate PEM and related disabilities among individuals with chronic fatigue syndrome (CFS). The purpose of this study was to assess the reproducibility of CPET variables in individuals who had been exposed to HD and to show that 2-day CPET is an objective means of differentiating between fatigue conditions in people with CFS symptoms who have been exposed to HDs. Twenty-nine HD survivors with CFS symptoms were enrolled in this study. To document and assess PEM in CFS, a 2-day CPET was conducted to measure baseline functional capacity (CPET1) and provoke PEM. Twenty-four hours later, a second CPET assessed changes in related variables, focusing on PEM effects on functional capacity. This CPET also measured changes in energy production and physiological function, objectively documenting PEM effects. In the 2-day CPET, the peak oxygen consumption (VO₂peak), VO₂ at ventilatory threshold (VO₂@VT), time to reach VO2peak, and time to reach VO₂@VT were significantly decreased (p<0.001). The peak O₂ pulse and O₂ pulse at VT also decreased significantly (p<0.001). A 6-minute walk test revealed significantly decreased distance (p<0.01). This is the first study to conduct a 2-day consecutive CPET in previously exposed HD participants with CFS symptoms. Our results confirm previous work that demonstrated abnormal responses to PEM in CFS patients. Therefore, a 2-day CPET is an objective measure to differentiate fatigue conditions in people with CFS symptoms who have been exposed to HDs.

#Chronic fatigue syndrome #post-exertional malaise #2-day cardiopulmonary exercise test #Peak oxygen consumption #Ventilatory threshold

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