European Journal of Applied Physiology

, Volume 94, Issue 3, pp 277–284 | Cite as

The effect of inspiratory muscle training upon maximum lactate steady-state and blood lactate concentration

Original Article


Several studies have reported that improvements in endurance performance following respiratory muscle training (RMT) are associated with a decrease in blood lactate concentration ([Lac]B). The present study examined whether pressure threshold inspiratory muscle training (IMT) elicits an increase in the cycling power output corresponding to the maximum lactate steady state (MLSS). Using a double-blind, placebo-controlled design, 12 healthy, non-endurance-trained male participants were assigned in equal numbers to an experimental (IMT) or sham training control (placebo) group. Cycling power output at MLSS was initially identified using a lactate minimum protocol followed by a series of constant power output rides (2.5% increments) of 29.5 min duration; MLSS was reassessed following six weeks of IMT or sham IMT. Maximum inspiratory mouth pressure increased significantly (26%) in the IMT group, but remained unchanged in the placebo group. The cycling power output corresponding to MLSS remained unchanged in both groups after the intervention. After IMT, [Lac]B decreased significantly at MLSS power in the IMT group [−1.17 (1.01) mmol l−1 after 29.5 min of cycling; mean (SD)], but remained unchanged in the placebo group [+0.37 (1.66) mmol l−1]. These data support previous observations that IMT results in a decrease in [Lac]B at a given intensity of exercise. That such a decrease in [Lac]B was not associated with a substantial (>2.5%) increase in MLSS power is a new finding suggesting that RMT-induced increases in exercise tolerance and reductions in [Lac]B are not ascribable to a substantial increase in the ‘lactate threshold’.


Blood lactate Ergogenic Lactate threshold Respiratory muscle training 



Alison McConnell declares a beneficial interest in the POWERbreathe inspiratory muscle trainer.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Sport Sciences, School of Sport and EducationBrunel UniversityUxbridgeUK
  2. 2.Division of Sport Science, School of ScienceThe Nottingham Trent UniversityNottinghamUK

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