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Breathing frequency versus an approximation of the respiratory work against lungs compliance. for the minute ventilation equal to 8 l/min and CPAP = 0.0, 0.4, 0.8, 1.2, and 1.6 kPa (the respiratory work is presented as the percentage of the work when CPAP = 0 and the frequency = 6/min). CPAP influences optimal frequency, i.e. the frequency, for which the respiratory work is minimal: the greater the CPAP value, the greater the optimal frequency.
