Blood lactate during recovery from intense exercise: Impact of inspiratory loading

Blood lactate during recovery from intense exercise: Impact of inspiratory loading

Author Chiappa, Gaspar R. Google Scholar
Roseguini, Bruno T. Google Scholar
Alves, Cristiano N. Google Scholar
Ferlin, Elton L. Google Scholar
Neder, Jose Alberto Autor UNIFESP Google Scholar
Ribeiro, Jorge P. Google Scholar
Institution Hosp Clin Porto Alegre
Univ Fed Rio Grande do Sul
Universidade Federal de São Paulo (UNIFESP)
Abstract Purpose: It has long been suggested that inspiratory muscle activity may impact blood lactate levels ([Lac(-)](B)) during the recovery from dynamic exercise. in this study, we tested the hypothesis that inspiratory muscle activation during recovery from intense exercise would contribute to La- clearance, thus leading to reduced [Lac(-)](B.) Methods: Twelve healthy men underwent two maximal, incremental exercise tests on different days. During a 20-min inactive recovery period, they breathed freely or against a fixed inspiratory resistance of 15 cm H2O. During recovery, pulmonary gas exchange was continuously monitored, and serial samples of arterialized venous blood were obtained for [Lac(-)](B), pH, PCO2, and HCO3 (-), Results: Subjects presented similar ventilatory and gas-exchange responses at peak exercise during both experimental conditions. [Lac(-)](B) during recovery was reduced with inspiratory resistance (7.7 +/- 1 vs 10.4 +/- 1, 7.8 2 vs 10.3 +/- 2, and 7.3 +/- 1 vs 9.7 +/- 2 mM at 5, 7, and 9 min of recovery, respectively; P < 0.05), but no differences were found for blood acid-base status. Inspiratory resistance was associated with increased metabolic demand (VO2 and VCO2) but improved ventilatory efficiency, with lower V-E/[VCO2] and increased alveolar ventilation. Conclusion: These data are consistent with the notion that inspiratory muscles may be net consumers of lactate during recovery from intense exercise.
Keywords lactate metabolism
excess postexercise oxygen consumption
inspiratory muscles
work of breathing
Language English
Date 2008-01-01
Published in Medicine and Science in Sports and Exercise. Philadelphia: Lippincott Williams & Wilkins, v. 40, n. 1, p. 111-116, 2008.
ISSN 0195-9131 (Sherpa/Romeo, impact factor)
Publisher Lippincott Williams & Wilkins
Extent 111-116
Origin http://dx.doi.org/10.1249/mss.0b013e3181591de1
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000251870900016
URI http://repositorio.unifesp.br/handle/11600/30244

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