Respiratory muscle endurance training in humans increases cycling endurance without affecting blood gas concentrations

Isolated respiratory muscle endurance training (RMT) can prolong constant-intensity cycling performance. We tested whether RMT affects O2 supply during exercise, i.e. whether the partial pressure of oxygen in arterial blood (Pa,O2) and/or its oxygen saturation (SaO2) are higher during exercise after...

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Bibliographic Details
Published in:European journal of applied physiology 2001-06, Vol.84 (6), p.582-586
Main Authors: Stuessi, C, Spengler, C M, Knöpfli-Lenzin, C, Markov, G, Boutellier, U
Format: Article
Language:English
Subjects:
Adult
Bicycling - physiology
Exercise
Female
Heart rate
Hemoglobin
Humans
Male
Oxygen - blood
Oxygen saturation
Physical Endurance - physiology
Physiology
Random Allocation
Respiratory Function Tests
Respiratory Muscles - physiology
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Summary:Isolated respiratory muscle endurance training (RMT) can prolong constant-intensity cycling performance. We tested whether RMT affects O2 supply during exercise, i.e. whether the partial pressure of oxygen in arterial blood (Pa,O2) and/or its oxygen saturation (SaO2) are higher during exercise after RMT than before. A group of 28 sedentary subjects were randomly assigned to either an RMT (n = 13) or a control group (n = 15). The RMT consisted of 40x30 min sessions of normocapnic hyperpnoea. The control group did not perform any training. Breathing and cycling endurance time as well as PaO2 and SaO2 during cycling at a constant intensity of 70% maximum power output were measured before and after the RMT or the control period. Mean breathing endurance increased significantly after RMT compared to control [RMT 5.2 (SD 2.9) vs 38.1 (SD 6.8) min, control 6.5 (SD 5.7) vs 6.4 (SD 7.6) min; P < 0.01], as did mean cycling endurance [RMT 35.6 (SD 11.9) vs 44.0 (SD 17.2) min, control 32.8 (SD 11.6) vs 31.4 (SD 14.4) min; P
ISSN:1439-6319
1439-6327
DOI:10.1007/s004210100408