Archive for the ‘Airflow Obstruction’ Category

Dillard et al have shown that maximal exercise ventilation in patients with CAO correlates with peak inspiratory flow rate as well as the FEV. It is not clear why the training induced decrease of H/rtot in our study was not translated into improved exercise performance. Possibly threshold pressure breathing is just not specific enough with […]

Not only did Ti/Ttot decrease during the course of threshold breathing training, but this training led to substantial improvements in maximum inspiratory pressure, training pressure, and the work and pressure-time integral of threshold breathing. These improvements leave little doubt that IMT did train the inspiratory muscles of our patients. We cannot exclude the possibility of […]

Sonne and Davis found that resistive inspiratory training led to improved maximal exercise ventilation, oxygen uptake and work rate on a cycle ergometer, with no change in a sham training group. Jones et al, using a very similar program, with the addition of a third group who undertook simple physical exercises, found that all three […]

We used P=0.31 m to estimate pressure and found it to be 99.3 ± 5.7 percent of measured Pm determined by planimetry. The SIP before training was significantly correlated with MIP-FRC (r = .667, p<.05) and with MIP-RV (Fig 4, r = .89, p<.01). more Over the course of six weeks, IMT produced significant increases […]

Control Group We considered the possibility that increases in MIP observed in our training group were produced by familiarization with the test rather than as a result of IMT. Therefore, we recruited a further seven patients who satisfied the entry criteria and measured MIP on two occasions six weeks apart. They had no IMT and […]

During the first and last threshold pressure trials of the training period, we continuously measured inspiratory flow and pressure (Pm) at the mouth. Breath by breath flow-time and pressure-time signals and inspiratory flow-volume and pressure-volume curves were recorded on a chart (Fig 2). This allowed measurement of respiratory frequency (f) and inspired minute ventilation (Vi). […]

The MSBC was adapted from the four-minute test described by Freedman (1970). It was determined by asking the patients to breathe humidified air as rapidly and as deeply as possible for three minutes via a low resistance two-way valve and minute ventilation was recorded. Eucapnea was maintained by adding carbon dioxide to the inspired gas […]

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