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J Appl Physiol 85: 254-258, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 1, 254-258, July 1998

Mechanical work of breathing during maximal voluntary ventilation

Joseph Milic-Emili1 and Marcello M. Orzalesi2

1 Meakins-Christie Laboratories, McGill University, Montreal, Canada H2X 2P2; and 2 Ospedale Bambino Gesú, Istituto di Ricovero di Cura a Carattere Scientifico, Rome 00165, Italy

With the use of the esophageal balloon technique, the working capacity of the respiratory muscles was assessed in four normal subjects by measuring the work per breath (W) and respiratory power (W) during maximal voluntary ventilation with imposed respiratory frequencies (f) ranging from 20 to 273 cycles/min. Measurements were made in a body plethysmograph to assess the work wasted as a result of alveolar gas compressibility (Wg'). In line with other types of human voluntary muscle activity, W decreased with increasing f, whereas W exhibited a maximum at f of ~100 cycles/min. Up to this f value, Wg' was small relative to W. With further increase in f, the Wg'/W ratio increased progressively, amounting to 8-22% of W at f of 200 cycles/min.

frequency dependence of work of breathing; working capacity of respiratory muscles; compressibility of alveolar gas


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