Lingual Alveolar Pressure as Percent of Maximum Isometric Pressure
This data set was used for the linear mixed model ANOVA analysis in the article: Articulation Contact Pressures Scaled to the Physiologic Range of the Tongue in Amyotrophic Lateral Sclerosis: A Pilot Study. The file is a SPSS version 25 file saved as a data set. The data set includes the individual participant Maximum Isometric Pressure (MIP for the tongue. Participants pressed the tip of the tongue against the alveolar ridge where a miniature sensor (Entran EPI-BO) was placed. This was a 3 second press with verbal encouragement (but not visual feedback) repeated 6 times with a 30 second break between trials. The maximum value of the 6 trials is reported in the data set here as that individuals MIPTongue. Also included is the "Percent Maximum" or %Max value calculated for stops (/t/ and /d/ data combined), fricatives (/s/ and /z/ data combined), /l/, and /n/. To arrive at the calculation each participant read a set of 6 sentences from a screen using their 'typical speech' as tongue to palate contact pressure on the alveolar ridge was sensed with the same transducer as above. Each sentence was repeated 5 times in a fully random order. Sentences were linguistically meaningful 4 syllable phrases with the target phoneme initiating a CVC word that was the second syllable. A peak picking routine in LabChart v8.1 was used to identify the calibrated peak contact pressure for all repetitions of the experimental phonemes. Preliminary analysis showed no difference in articulatory contact pressures (ACP) between /t/ and /d/, and not difference for /s/ and /z/, within an individual so these values were collapsed into a grand mean for an individual for 'stops' and one for 'fricatives'. The calculation of %Max is: ACP/MIPTongue * 100. For each individual, %Max is reported for Stops, Fricatives, /l/, and /n/. In the data set, the 'Group' variable included 1 = controls, 2 = ALS participant with bulbar symptoms at study entry, and 3 = ALS participant with only spinal symptoms at study entry. The variable 'DiseaseState' has two levels: 1 = non ALS and 2 = ALS. The variable 'Time' has 3 levels: 1 = study entry, 2 = 3 months from baseline [+/- 5 days], and 3 = 6 months from baseline [+/- 5 days].