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J Appl Physiol 94: 462-468, 2003. First published September 20, 2002; doi:10.1152/japplphysiol.00364.2002
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Vol. 94, Issue 2, 462-468, February 2003

Effect of inspiratory muscle strength training on inspiratory motor drive and RREP early peak components

Chien Hui Huang, A. Daniel Martin, and Paul W. Davenport

Departments of Physical Therapy and Physiological Sciences, University of Florida, Gainesville, Florida 32610

This study investigated the effect of inspiratory muscle strength training (IMST) on inspiratory motor drive [mouth occlusion pressure at 0.1 s (P0.1)] and respiratory-related evoked potentials (RREP). It was hypothesized that, if IMST increased inspiratory muscle strength, inspiratory motor drive would decrease. If motor drive were related to the RREP, it was further hypothesized that an IMST-related decrease in drive would change RREP latency and/or amplitude. Twenty-three subjects received IMST at 75% of their maximal inspiratory pressure (PImax) with the use of a pressure threshold valve. IMST consisted of four sets of six breaths daily for 4 wk. P0.1 and the RREP were recorded before and after IMST. Posttraining, PImax increased significantly by 36.0 ± 2.7%. P0.1 decreased significantly by 21.9 ± 5.2%. The increase in PImax was significantly correlated to the decrease in P0.1. RREP peaks P1a, Nf, P1, and N1 were identified pre- and post-IMST, and there was no difference in either amplitude or latency for those peaks. These results demonstrate that high-intensity IMST significantly increased PImax, decreased P0.1, but did not change the RREP.

maximal inspiratory pressure; mouth occlusion pressure at 0.1 s; mouth occlusion pressure; evoked potential; pressure threshold training; respiratory-related evoked potentials


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