In the November 2011 issue of Medicine & Science in Sports & Exercise, researchers aimed to determine the effects of inspiratory muscle training (IMT) on exercise tolerance, inspiratory muscle fatigue, and the perception of dyspnea in individuals with asthma (2). Through the use of a matched double-blind placebo-controlled design, 15 subjects clinically diagnosed with mild to moderate asthma with an average age of 24 years were assigned to 6 wks of either IMT or sham IMT. The IMT program consisted of 30 breaths twice daily at 50% maximum inspiratory pressure (PI_(max), while the sham IMT program involved 60 breaths daily at 15% PI_(max). The parameters measured were time to the limit of exercise tolerance (T_(lim)), inspiratory muscle fatigue, and perceived dyspnea. T_(lim) was measured using constant-power output (70% peak power) cycle ergo-metry.
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