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Fig. 1— a) Flow/volume loops before and during a 5 hectopascal negative expiratory pressure technique (black trace) from an expiratory limited female with dyspnoea (grade 2) with no medical history, in the expiratory limitation and dyspnoea due to age group. The female was: aged 74 yrs, 1.44 m in height and weighed 64 kg. The subject had a forced expiratory volume (FEV1) of 1.21 L, a forced vital capacity (FVC) of 1.53 L and a FEV1/FVC ratio of 79.1%. b) A healthy 71-yr-old female, with a height of 1.55 m, a weight of 53 kg, a FEV1 of 1.76 L, a FVC of 2.25 L, and a FEV1/FVC ratio of 78.5%. The grey arrow denotes the beginning of the negative expiratory pressure technique (NEP) and the black arrows denote the end of the NEP. The open arrow denotes limitation. The grey traces represent the flow/volume curves while the subjects breathed with NEP.
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was presented incorrectly as shown and should have appeared as follows. 