Functional Outcomes Associated with Inspiratory Muscle Strength Training in Chronic Obstructive Pulmonary Disease Subjects: Narrative Review

Abstract

In this study, the literature review focuses on the available evidence for the effects of inspiratory muscle strength training (IMST) using a threshold loading device in participants with chronic obstructive pulmonary disease (COPD). The search involved a computerized database pertaining to studies that included the outcomes of a pressure threshold IMST published after the year 2000. Sixteen articles were selected which showed outcomes relating to inspiratory muscle strength (maximal inspiratory pressure), respiratory muscle function, dyspnea, functional capacity, and health-related quality of life in COPD participants. However, the IMST protocols varied in the different studies. Most of the studies demonstrated promising and significant improvements in most of the outcomes of IMST in COPD patients; however, the effects on respiratory function remain equivocal and need to be explored further through future research.