Effects of an intensive voice treatment on articulatory function and speech intelligibility in children with motor speech disorders: A phase one study

•Intensive voice treatment (LSVT LOUD®) may foster changes in articulation.•Changes for children with cerebral palsy were observed in vowel duration.•Changes for children with cerebral palsy were observed in acoustic vowel space.•Changes for children with Down syndrome were observed in acoustic vowel space.•Preliminary findings show spreading effects of LSVT LOUD to include articulation.