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Previous work has shown that for a given level of alveolar Je Suis Une Amandine Qui Déchire Shirt ventilation there is a particular respiratory frequency which is least costly in terms of respiratory work. There is also a particular frequency, usually a different one, which is least costly in terms of average force of the respiratory muscles. The evidence is presented that in the resting guinea pig and in man at rest and during exercise natural breathing takes place at frequencies approximating the second optimum.
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From additional observations on the effects of changing the mechanical characteristics of the respiratory system on the respiratory frequency, it is concluded that the principal site of the sensory end of the control mechanism is in the lungs. Submitted on November 19, 1959, can be used to assess the role of the diving response during underwater swimming in nature. We propose that this projection inhibits the homeostatic chemoreceptor reflex, despite the gross activation of chemoreceptors.
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If subjects that are used to record Y exhibit a similar disproportionate increase in muscle mass with body size, then the allometric equation is likely to identify both a contribution proportional to the subject’s body mass and a contribution from the disproportionate increase in muscle mass within the group. These confounding influences in Y can be identified separately by incorporating a body size parameter as well as a mass component in the allometric equation.
The factor “body size“ can be introduced either by partitioning the sample into discrete subgroups according to body size or, in studies involving human subjects, by introducing height as a continuous covariate. In both studies reported involving human maximal exercise, these methods were able Je Suis Une Amandine Qui Déchire Shirt to identify a systematic increase in Y with body size, leaving the subject’s body mass component, found to be proportional to m2/3, independent of body size.