Abstract
The maximum performance measures of speech production include: phonation volume, maximum phonation time, maximum expiratory pressure, maximum vocal SPL, physiological vocal frequency range, maximum articulatory force, and maximum syllable repetition rate. A survey of the normative data seemed in order, given the frequent clinical use of these measures and the availability of a large, although scattered, archival database for normal speakers. This report reviews published data for each measure and considers the adequacy of these data for clinical application. The data are found to be deficient in several respects: (1) the effects of subject age and sex are incompletely documented; (2) test procedures are not standardized; (3) the validity of a maximum performance estimate is open to question for most, if not all, measures; (4) the variability of the data within and across studies is very large; and (5) a theoretical framework for the interpretation of the measures is either lacking or deficient. Recommenda...
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