The effect of inspiratory muscle training on high-intensity, intermittent running performance to exhaustion

Tom Kwokkeung Tong; Frank Hokin Fu; Pak Kwong Chung; Eston, Roger; Kui Lu; Binh Quach; Jinlei Nie; So, Raymond
August 2008
Applied Physiology, Nutrition & Metabolism;Aug2008, Vol. 33 Issue 4, p671
Academic Journal
The effects of inspiratory muscle (IM) training on maximal 20 m shuttle run performance (Ex) during Yo-Yo intermittent recovery test and on the physiological and perceptual responses to the running test were examined. Thirty men were randomly allocated to 1 of 3 groups. The experimental group underwent a 6 week pressure threshold IM training program by performing 30 inspiratory efforts twice daily, 6 d/week, against a load equivalent to 50% maximal static inspiratory pressure. The placebo group performed the same training procedure but with a minimal inspiratory load. The control group received no training. In post-intervention assessments, IM function was enhanced by >30% in the experimental group. The Ex was improved by 16.3% ± 3.9%, while the rate of increase in intensity of breathlessness (RPB/4i) was reduced by 11.0% ± 6.2%. Further, the whole-body metabolic stress reflected by the accumulations of plasma ammonia, uric acid, and blood lactate during the Yo-Yo test at the same absolute intensity was attenuated. For the control and placebo groups, no significant change in these variables was observed. In comparison with previous observations that the reduced RPB/4i resulting from IM warm-up was the major reason for improved Ex, the reduced RPB/4i resulting from the IM training program was lower despite the greater enhancement of IM function, whereas improvement in Ex was similar. Such findings suggest that although both IM training and warm-up improve the tolerance of intense intermittent exercise, the underlying mechanisms may be different. Dans cette étude, nous analysons l’effet de l’entraînement des muscles de l’inspiration (IM) sur le nombre de répétitions d’une course de 20 m (Ex) au cours du test Yo-Yo constitué de périodes intermittentes de récupération ; au cours de l’épreuve de course, on évalue aussi les ajustements physiologiques et perceptuels. Trente sujets sont répartis aléatoirement dans l’un des trois groupes : le groupe expérimental participe à un entraînement des muscles de l’inspiration d’une durée de six semaines consistant en 30 inspirations exécutées deux fois par jour, 6 fois par semaine à un seuil de pression équivalant à 50 % de la pression statique maximale observée au cours de l’inspiration. Le groupe placebo fait le même entraînement, mais contre une résistance minimale à l’inspiration et le groupe de contrôle de s’entraîne pas. À la suite du programme d’entraînement, on observe une amélioration de la fonction IM de plus 30 % chez le groupe expérimental. Le nombre de répétitions d’une course de 20 m augmente de 16,3 % ± 3,9 % et la vitesse de l’installation de la sensation d’essoufflement (RPB/4i) diminue de 11,0 % ± 6,2 %. De plus, on observe une diminution du stress métabolique global de l’organisme comme le révèlent les valeurs des concentrations plasmatiques d’ammoniac, d’acide urique et des concentrations sanguines de lactate au cours du test Yo-Yo réalisé à la même intensité absolue de travail. On n’observe aucune modification significative des valeurs de ces variables chez les deux autres groupes. Dans une étude antérieure, les auteurs ont observé que l’augmentation de Ex était due à la diminution de RPB/4i causée par l’échauffement des muscles de l’inspiration. Dans cette étude, on observe une moins grande diminution de RPB/4i et ce, même en présence d’une plus grande amélioration de la fonction IM et d’une même amélioration de Ex. D’après ces observations, l’entraînement et l’échauffement des muscles de l’inspiration améliorent la tolérance à la fatigue au cours d’un vigoureux exercice intermittent, mais les mécanismes semblent différents.


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