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Following the completion of baseline and pre-intervention measures, the training group performed 30 inspiratory efforts twice daily for a period of 4 weeks. Each effort required the subject to inspire against a resistance equivalent to 40% peak inspiratory mouth pressure (pMIP) using a commercially available inspiratory muscle trainer...The control group trained using the same device, however, they were required to perform 60 breaths once daily for 4 weeks at a resistance to inspiration equivalent to 15% peak pMIP, a load known to elicit a negligible training effect.
...Results are expressed as a percent change from baseline measures (obtained in visit 1); thus the pre-IMT changes indicate non-intervention variability. In the training group pMIP increased by 45.3% post intervention whilst Tlim increased by 25.2% relative to baseline. Furthermore, blood lactate, heart rate and ratings of perceived exertion were all attenuated. In the control group no significant changes were observed in any measures.
Whilst preliminary in nature, these results indicate that resistive, flow independent inspiratory muscle training improves submaximal exercise performance in endurance trained subjects. Furthermore they add credibility to Boutellier's assertion that, "the respiratory system is an exercise limiting factor in normal, endurance trained subjects.
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