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• W2126664623 abstract "Background The present study investigated the effect of repeated hypercapnic challenges on the sensory (intensity [I]) and affective (unpleasantness [U]) dimensions of breathlessness. Methods Three subsequent rebreathing trials (Read, 1968) were administered to healthy men and women (n = 39). The I and U of breathlessness were rated every 20 s during the baseline, rebreathing, and recovery phases. Breathing behavior (fractional end-tidal CO2 [Fetco2] and minute ventilation [e]) was monitored continuously. Intraindividual linear regression slopes for Fetco2 and e] were calculated and standardized, separately for both rating dimensions. Results Both the absolute magnitude and the slope of the I of breathlessness were higher compared to U (p < 0.05). Across-trial habituation of the peak I and U of breathlessness occurred in both genders (p < 0.001), but habituation was larger for the U than for the I (p = 0.05). Conclusions The findings show that the sensory and affective dimensions of breathlessness can meaningfully be distinguished during hypercapnic challenges and that repeated exposures have different effects on both dimensions. The present study investigated the effect of repeated hypercapnic challenges on the sensory (intensity [I]) and affective (unpleasantness [U]) dimensions of breathlessness. Three subsequent rebreathing trials (Read, 1968) were administered to healthy men and women (n = 39). The I and U of breathlessness were rated every 20 s during the baseline, rebreathing, and recovery phases. Breathing behavior (fractional end-tidal CO2 [Fetco2] and minute ventilation [e]) was monitored continuously. Intraindividual linear regression slopes for Fetco2 and e] were calculated and standardized, separately for both rating dimensions. Both the absolute magnitude and the slope of the I of breathlessness were higher compared to U (p < 0.05). Across-trial habituation of the peak I and U of breathlessness occurred in both genders (p < 0.001), but habituation was larger for the U than for the I (p = 0.05). The findings show that the sensory and affective dimensions of breathlessness can meaningfully be distinguished during hypercapnic challenges and that repeated exposures have different effects on both dimensions." @default.
• W2126664623 created "2016-06-24" @default.
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• W2126664623 date "2009-02-01" @default.
• W2126664623 modified "2023-10-10" @default.
• W2126664623 title "Repeated Breathlessness Experiences Induced by Hypercapnia" @default.
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• W2126664623 doi "https://doi.org/10.1378/chest.08-1226" @default.
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