Effect of Inspiratory Muscle Training on Exercise Tolerance in Asthmatic Individuals

Turner, Louise, Mickleborough, Timothy, McConnell, Alison, Stager, Joel, Tecklenburg-Lund, Sandra and Lindley, Martin (2011) Effect of Inspiratory Muscle Training on Exercise Tolerance in Asthmatic Individuals. Medicine & Science in Sports & Exercise, 43 (11). pp. 2031-2038. ISSN 0195-9131

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Official URL: http://dx.doi.org/10.1249/MSS.0b013e31821f4090

Abstract

The aim of this study was to determine the effects of inspiratory muscle training (IMT) on exercise tolerance, inspiratory muscle fatigue, and the perception of dyspnea in asthmatic individuals.
Using a matched double-blind placebo-controlled design, 15 clinically diagnosed asthmatic individuals underwent either 6 wk of IMT (n = 7) consisting of 30 breaths twice daily at 50% maximum inspiratory pressure (PImax) or sham-IMT (placebo; PLA, n = 8) consisting of 60 breaths daily at 15% PImax. Time to the limit of exercise tolerance (Tlim) was assessed using constant-power output (70% peak power) cycle ergometry. Inspiratory muscle fatigue was determined by comparing the pre- to postexercise reduction in PImax. Dyspnea during the Tlim test was evaluated at 2-min intervals using the Borg CR-10 scale.
There were no significant changes (P > 0.05) in Tlim, inspiratory muscle fatigue, or perception of dyspnea in the PLA group after the intervention. In contrast, in the IMT group, PImax increased by 28%, and Tlim increased by 16% (P < 0.05). Dyspnea during exercise was also reduced significantly by 16% (P < 0.05). The exercise-induced fall in PImax was reduced from 10% before IMT to 6% after IMT (P < 0.05), despite the longer Tlim. Pulmonary function remained unchanged in both the IMT and PLA groups.
These data suggest that IMT attenuates inspiratory muscle fatigue, reduces the perception of dyspnea, and increases exercise tolerance. These findings suggest that IMT may be a helpful adjunct to asthma management that has the potential to improve participation and adherence to exercise training in this group. However, the perception of breathlessness is also an important signal of bronchoconstriction, and thus, caution should be exercised if this symptom is abnormally low.

Item Type: Article
Uncontrolled Keywords: Respiratory muscle, dyspnea, asthma, exercise
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Ay Okpokam
Date Deposited: 15 Dec 2011 16:13
Last Modified: 10 Aug 2015 11:38
URI: http://nrl.northumbria.ac.uk/id/eprint/4146

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