Purpose: The purpose of this study was to assess the relationship between tongue strength and rate of articulation in 2 speech tasks, diadochokinetic rates and reading aloud, in healthy men and women between 20 and 78 years of age. Method: Diadochokinetic rates were measured for the syllables /p[wedge]/, /t[wedge]/, /k[wedge]/, and /p[wedge]t[schwa]k[schwa]/, and articulation rates were calculated for a reading of the Rainbow Passage for 57 adult volunteers. The Iowa Oral Performance Instrument (LLC Northwest) was used to obtain maximum tongue pressure, tongue pressure exerted during production of /t[wedge]/, and tongue endurance. Correlation analyses were performed to determine the relation among articulation rate and tongue pressure and endurance measures. Results: Maximum tongue pressure, the pressure used to produce /t[wedge]/, the proportion of maximum pressure used to produce /t[wedge]/, and tongue endurance were poor predictors of diadochokinetic rates and articulation rate in reading for healthy speakers. Discussion: Focus must remain on factors beyond strength, such as movement precision and coordination, to improve researchers' understanding of normal and disordered speech production in adults.