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* From the Department of Medicine A, Hillel-Yaffe Medical Center, Hadera, Israel.
Correspondence to: Paltiel Weiner, MD, Department of Medicine A, Hillel-Yaffe Medical Center, Hadera, Israel 38100
Background: It has been known for many years that there are variations between asthmatic patients in terms of their perception of breathlessness during airway obstruction.
Study objective: To investigate the relationship between ß2-agonist consumption and the score of perception of dyspnea, in mild asthmatics, and the relationship between the effect of specific inspiratory muscle training (SIMT) on the score of perception of dyspnea and ß2-agonist consumption in "high perceivers."
Methods: Daily ß2-agonist consumption was assessed during a 4-week run-in period in 82 patients with mild asthma. Patients with a mean ß2-agonist consumption of > 1 puff/d ("high consumers") then were randomized into two groups: one group of patients received SIMT for 3 months; the other group of patients was assigned as a control group and received sham training. Inspiratory muscle strength and perception of dyspnea were assessed before patients entered the study, following the 4-week run-in period, and after completing the training period.
Results: Following the 4-week run-in period, 23 high-consumer patients (mean [± SEM] ß2-agonist consumption, 2.7 ± 0.4 puffs/d) were detected. The mean Borg score during breathing against resistance was significantly higher (p < 0.05) in the patients with high ß2-agonist consumption than in the subjects with low mean ß2-agonist consumption. Following SIMT, the mean maximal inspiratory pressure increased significantly from 94.1 ± 5.1 to 109.7 ± 5.2 cm H2O (p < 0.005) in the training group. The increase in inspiratory muscle strength was associated with a statistically significant decrease in the mean Borg score during breathing against resistance (p < 0.05) as well as in the mean daily ß2-agonist consumption.
Conclusions: We have shown that patients with mild asthma, who have a high ß2-agonist consumption, have a higher perception of dyspnea than those with normal consumption. In addition, SIMT was associated with a decrease in perception of dyspnea and a decrease in ß2-agonist consumption.
Key Words: high consumption of inhaled ß2-agonists • inspiratory muscle training • perception of dyspnea
This article has been cited by other articles:
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  M. Beckerman, R. Magadle, M. Weiner, and P. Weiner The Effects of 1 Year of Specific Inspiratory Muscle Training in Patients With COPD Chest, November 1, 2005; 128(5): 3177 - 3182. [Abstract] [Full Text] [PDF]
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P. Weiner, R. Magadle, F. Massarwa, M. Beckerman, and N. Berar-Yanay Influence of Gender and Inspiratory Muscle Training on the Perception of Dyspnea in Patients With Asthma* Chest, July 1, 2002; 122(1): 197 - 201. [Abstract] [Full Text] [PDF]
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