In this paper, we present a study on the influence of expressivity on the articulation degree. It is a part of a project that aims to transform expressivity of an utterance for artistic purposes such as cinema, theater and contemporary music. It involves an expressive French database. An algorithm for formant frequency estimation is presented. A measure of the articulation degree is proposed. It involves a joint statistical analysis of the degree of expressive intensity, of the vocalic triangle area and of the speech rate, and shows that the articulation degree depends on expressivity. Using Lindblom’s theoretical framework, it is shown how this measure could be related to the activation degree of a dimensional representation of emotions.