For the proposed randomized controlled treatment study, the investigators plan to compare the effects of this hypoventilation-based breathing training with a control intervention that will focus on breathing regularity and awareness. The two therapeutic procedures are closely matched on important variables such as duration and the nature of patient-therapist interaction, monitoring asthma related status and the medication intake, use of scientific equipment and monitoring devices to increase adherence, and initial plausibility. Asthma patients who will be evaluated before, during, directly after, and at 2 months and 6 months after training.
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pCO2 levels (as an indicator of training manipulation success)
Timeframe: Measured at pre-treatment, post-treatment, 1-month follow-up, and 6-month follow-up, at the beginning of each of the five weekly training sessions, patients perform self-assessments on a daily basis throughout, pre- and post-treatment 2h monitoring
diurnal PEF variability (as an indicator of asthma pathophysiology and control)
Timeframe: pre-treatment, post-treatment, 1-month follow-up, and 6-month follow-up
Asthma Control Test (as a self-report indicator of asthma control)
Timeframe: Measured at pre-treatment, post-treatment, 1-month follow-up, and 6-month follow-up. Further assessments will be made at the beginning of each of the five weekly training sessions.