Paramètres acoustiques et phonétiques dans la parole parkinsonienne avant et après traitement LSVT LOUD® (Acoustic and phonetic parameters in parkinsonian speech before and after LSVT LOUD® Purpose: Our research examines the effect of the Lee Silverman Voice Treatment (LSVT LOUD®) on the area and position of the vowel space, fundamental frequency (f0), voice quality parameters, speech rate, maximum phonation time (MPT) and patient-perceived vocal handicap in Frenchspeaking patients with Parkinson’s disease)