Inspiratory resistive loading after all-out exercise improves subsequent performance

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2009-05-01
Autores
Chiappa, Gaspar R.
Ribeiro, Jorge P.
Alves, Cristiano N.
Vieira, Paulo J. C.
Dubas, Joao [UNIFESP]
Queiroga, Fernando [UNIFESP]
Batista, Laura D. [UNIFESP]
Silva, Antonio C. [UNIFESP]
Neder, J. Alberto [UNIFESP]
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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 H(2)O) 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 (Delta HHb), were recorded. [Lac (b) (-) ] was significantly reduced after 4 min of recovery with IRL (peak [Lac (b) (-) ] 12.5 +/- A 2.3 mmol l(-1) with free-breathing vs. 9.8 +/- A 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 O(2) 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.
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European Journal of Applied Physiology. New York: Springer, v. 106, n. 2, p. 297-303, 2009.