There has been far less research on the effects of IMT with patients who have asthma. A 2013 Cochrane systematic review (Silva et al., 2013) concluded that,
“There is no conclusive evidence in this review to support or refute inspiratory muscle training for asthma. The evidence was limited by the small number of trials with few participants..”.
Notwithstanding, there are a number of similarities between the neuromechanical mechanisms intensifying dyspnoea in acute asthma and in COPD. Accordingly, it is reasonable to suggest that, for at least some people with asthma, IMT will have the same benefits as have been shown for patients with COPD (Beaumont et al., 2018; O'Donnell et al., 2019). Furthermore, based on the observation that,
“IMT has been shown to decrease dyspnea, increase inspiratory muscle strength, and improve exercise capacity in asthmatic individuals”, a 2016 narrative review (Shei, Paris, Wilhite, Chapman, & Mickleborough, 2016) recommended that:
“In order to develop more concrete recommendations regarding IMT as an effective low-cost adjunct in addition to traditional asthma treatments, we recommend that a standard treatment protocol be developed and tested in a placebocontrolled clinical trial with a large representative sample”.
The most recent randomised controlled trial of IMT with patients who have asthma (Duruturk, Acar, & Dogrul, 2018) concluded:
“These findings suggest that IMT may be an effective modality to enhance respiratory muscle strength, exercise capacity, quality of life, daily living activities, reduced perception of dyspnea, and fatigue in asthmatic patients”.