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Since lung function is the most important factor regarding survival in ALS, and since I have not been given a pulmonary test for a year, I purchased a spirometer and started logging my main lung parameters daily, starting on Jan 3, 2014. The logging is done through a php script directly to a database, and the results are visible in real time in the chart below.

The starting values are around 60 % of nominal, so I did not start a minute too early. 

Explanations for the parameters

FVC - forced expiratory vital capacity: The volume change of the lung between a full inspiration to total lung capacity and a maximal expiration to residual volume.

FEV1 - forced expiratory volume in 1 second: The FEV1 is the volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity.

PEF - peak expiratory flow: Peak expiratory flow (PEF) is the maximum flow generated during expiration performed with maximal force and started after a full inspiration.

FEF2575 - maximum midespiratory flow: The MMEF (maximum midexpiratory flow) is the average expiratory flow over the middle half of the FVC. 

FIVC - forced inspiratory vital capacity: The volume change of the lung between a maximal expiration to residual volume and a full inspiration to total lung capacity.