Inspiratory resistive loading after all-out exercise improves subsequent performance

• Published in: European journal of applied physiology 2009-05, Vol.106 (2), p.297-303
• Main Authors: Chiappa, Gaspar R., Ribeiro, Jorge P., Alves, Cristiano N., Vieira, Paulo J. C., Dubas, João, Queiroga, Fernando, Batista, Laura D., Silva, Antonio C., Alberto Neder, J.
• Format: Article
• Language: English
• Subjects: Adult; Biological and medical sciences; Biomedical and Life Sciences; Biomedicine; Caffeine; Exercise - physiology; Fundamental and applied biological sciences. Psychology; Human Physiology; Humans; Inhalation - physiology; Inspiratory Capacity; Lactic Acid - blood; Male; Metabolism; Muscle Contraction - physiology; Muscle Fatigue - physiology; Muscle, Skeletal - physiology; Occupational Medicine/Industrial Medicine; Original Article; Oxygen Consumption; Physical Endurance; Physiology; Respiratory Muscles - physiology; Spectrum analysis; Sports Medicine; Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
• ISSN: 1439-6319; 1439-6327
• DOI: 10.1007/s00421-009-1022-9

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 (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 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