Edwards, A.M. (2013) Respiratory muscle training extends exercise tolerance without concomitant change to peak oxygen uptake: physiological, performance and perceptual responses derived from the same incremental exercise test. Respirology, 18 (6). pp. 1022-1027.

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Abstract

Background and objective: There is conjecture over the efficacy of respiratory muscle training (RMT). The aim of this study was to establish whether or not exercise tolerance, physical performance and effort perceptions are influenced by RMT.

Methods: Thirty-six healthy males (age 24 ± 4)agreed to participate (experimental group (EXP) n = 18, control (CON) n = 18). RMT was performed using an inspiratory pressure-threshold training device at either 55% (EXP) or 10% (CON) of maximal inspiratory effort. Measurements of spirometry and maximal static inspiratory mouth pressure were taken before and after 4weeks ofRMTin addition to an incremental test to volitional exhaustion for the determination of: (i) VO₂peak; (ii) maximal velocity at volitional exhaustion (vVO₂peak)); (iii) time to volitional exhaustion; and (iv) effort perceptions.

Results: There were no differences in spirometry, but mean maximal static inspiratory mouth pressure increased significantly in EXP (P < 0.01). VO₂peak was unchanged following the 4-week intervention for both EXP and CON, although the proportion of EXP attaining the criteria for a VO₂ plateau significantly increased (P < 0.05).Both time to volitional exhaustion(P < 0.05) and vVO2peak were significantly improved for EXP (P < 0.05), while effort perceptions were reduced (P < 0.05).

Conclusions: EXP tolerated higher running velocities during incremental exercise and demonstrated a significant flattening (plateau) of VO₂ after training. This suggests that RMTmay promote an improved performance outcome vVO₂peak probably as a result of blunted afferent sensations reducing the perceived discomfort of exercise at high ventilatory loads.

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