Inspiratory resistive loading after all-out exercise improves subsequent performance
We have previously shown that post-exercise inspiratory resistive loading (IRL) reduces blood lactate ([Lac b − ]). In this study, we tested the hypothesis that IRL during recovery could improve subsequent exercise performance. Eight healthy men underwent, on different days, two sequential 30-s, cycle ergometer Wingate tests. During the 10-min recovery period from test 1, subjects breathed freely or through an inspiratory resistance (15 cm H2O) with passive leg recovery. Arterialized [Lac b − ] values, perceptual scores (Borg), cardiac output by impedance cardiography (QT), and changes in the deoxygenation status of the M. vastus lateralis by near-infrared spectroscopy (ΔHHb), were recorded. [Lac b − ] was significantly reduced after 4 min of recovery with IRL (peak [Lac b − ] 12.5 ± 2.3 mmol l−1 with free-breathing vs. 9.8 ± 1.5 mmol l−1 with IRL). Effort perception was reduced during late recovery with IRL compared with free-breathing. Cardiac work was increased with IRL, since heart rate and QT were elevated during late recovery. Peripheral muscle reoxygenation, however, was significantly impaired with IRL, suggesting that post-exercise convective O2 delivery to the lower limbs was reduced. Importantly, IRL had a dual effect on subsequent performance, i.e., improvement in peak and mean power, but increased fatigue index (P < 0.05). Our data demonstrate that IRL after a Wingate test reduces post-exercise effort perception and improves peak power on subsequent all-out maximal-intensity exercise.
KeywordsRespiratory muscles Wingate test Hemodynamics Near-infrared spectroscopy Lactate
The authors would like to thank Prof. Luiz E. Nery (Division of Respiratory Diseases. Department of Medicine, Federal University of Sao Paulo, UNIFESP) for his valuable input and methodological insights. They also thank all colleagues from the Pulmonary Function and Clinical Exercise Physiology Unit (SEFICE, UNIFESP) for their friendly collaboration. They are specifically grateful for the support of Ana Cristina Gimenes, MSc, PT, Ana Cristina Barroso, PT, Daniela Bravo, PT, and Ms. Dircilene P. Moreira. More importantly, however, they are indebted to the individuals for their effort and enthusiastic cooperation throughout the study. GRC is a Post-Doctoral Researcher at the Federal University of São Paulo, supported by a Fellowship Grant from FAPESP (Fundação de Amparo à Pesquisa do Estado de Sao Paulo, São Paulo, Brazil) No 07/50391-5. JAN is an Established Investigator (level II) of the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil.
Conflict of interest statement
The authors report no potential conflict of interest related to the content of this article.
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