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Int J Sports Physiol Perform. 2019 Jan 31:1-27. doi: 10.1123/ijspp.2018-0483. [Epub ahead of print]

Inspiratory Muscle Training: Improvement of Exercise Performance With Acute Hypoxic Exposure.

Author information

1
1 Human Performance Laboratory, Department of Kinesiology, Indiana University, Bloomington, IN.
2
2 Department of Anesthesiology, Mayo Clinic, Rochester, MN.

Abstract

PURPOSE::

To determine whether chronic IMT improves submaximal exercise performance with acute hypoxic exposure.

METHODS::

Fourteen endurance-trained men completed a 20km cycling time trial (TT) in normobaric hypoxia (FIO2=0.16) before and after either 6wk of an IMT protocol consisting of inspiratory loads equivalent to 80% of sustained maximal inspiratory pressure ((SMIP); n=9), or a SHAM protocol (30% of SMIP; n=5).

RESULTS::

In the IMT group, 20km TT performance significantly improved by 1.4 ± 2.0% (P=0.032) after the 6wk intervention. The significantly faster TT times were accompanied by a higher average V̇E (pre vs. post: 99.3 ± 14.5 vs. 109.9 ± 18.0 L·min-1, P=0.012) and absolute oxygen uptake (V̇O2) (pre vs. post: 3.39 ± 0.52 vs. 3.60 ± 0.58 L·min-1, P=0.010), with no change in ratings of perceived exertion or dyspnea (P>0.055). There were no changes in TT performance in the SHAM group (P=0.448).

CONCLUSIONS::

Our data suggest that performing 6wk of inspiratory muscle training may benefit hypoxic endurance exercise performance lasting 30-40 minutes.

KEYWORDS:

altitude; dyspnea; near-infrared spectroscopy; time trial exercise; ventilation

PMID:
30702370
DOI:
10.1123/ijspp.2018-0483

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