Determinants of inspiratory muscle strength in healthy humans

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Brown, P.I., Johnson, M.A. ORCID: 0000-0002-8226-9438 and Sharpe, G.R. ORCID: 0000-0002-4575-2332, 2014. Determinants of inspiratory muscle strength in healthy humans. Respiratory Physiology & Neurobiology, 196, pp. 50-55. ISSN 1569-9048

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Official URL: http://dx.doi.org/10.1016/j.resp.2014.02.014

Abstract

We investigated 1) the relationship between the baseline and inspiratory muscle training (IMT) induced increase in maximal inspiratory pressure (PI,max) and 2) the relative contributions of the inspiratory chest wall muscles and the diaphragm (Poes/Pdi) to PI,max prior to and following-IMT. Experiment 1: PI,max was assessed during a Müeller manoeuvre before and after 4-wk IMT (n=30). Experiment 2: PI,max and the relative contribution of the inspiratory chest wall muscles to the diaphragm (Poes/Pdi) were assessed during a Müeller manoeuvre before and after 4-wk IMT (n=20). Experiment 1: PI,max increased 19% (P<0.01) post-IMT and was correlated with baseline PI,max (r=−0.373, P<0.05). Experiment 2: baseline PI,max was correlated with Poe/Pdi (r=0.582, P<0.05) and after IMT PI,max increased 22% and Poe/Pdi increased 5% (P<0.05). In conclusion, baseline PI,max and the contribution of the chest wall inspiratory muscles relative to the diaphragm affect, in part, baseline and IMT-induced ΔPI,max. Great care should be taken when designing future IMT studies to ensure parity in the between-subject baseline PI,max.

Item Type:

Journal article

Publication Title:

Respiratory Physiology & Neurobiology

Creators:

Brown, P.I., Johnson, M.A. and Sharpe, G.R.

Publisher:

Elsevier

Place of Publication:

Amsterdam, Netherlands

Date:

2014