Digital Voice Analysis of the Effects of Temporomandibular Joint Mobilization and Tongue Strengthening Exercises on Voice and Tongue Function in a Patient with Motor Speech Disorder Following Traumatic Brain Injury : A Single Case Study

다국어 초록 (Multilingual Abstract)

This study aimed to investigate the effects of temporomandibular joint (TMJ) mobilization and tongue strengthening exercises on voice in a patient with motor speech disorder following traumatic brain injury (TBI). A single patient received intervention five times per week for a total of 34 sessions, each lasting 30 minutes. The program consisted of Kaltenborn joint mobilization, the Iowa Oral Performance Instrument (IOPI), and proprioceptive neuromuscular facilitation (PNF) techniques to improve TMJ mobility and strengthen tongue muscles. To examine the effects on voice, acoustic analysis was performed to evaluate vocal parameters, and task performance was measured. First, comparison of acoustic parameters before and after the intervention including fundamental frequency, jitter, shimmer, and noise to harmonics ratio showed improvements in some measures related to speech production. Second, diadochokinetic rate was assessed to evaluate articulatory coordination. Third, maximum phonation time was measured to analyze respiratory control, phonatory pattern, and phonation duration. The findings demonstrated that TMJ mobilization and tongue strengthening exercises positively influenced several aspects of speech and voice production. TMJ mobilization and tongue-strengthening exercises had positive effects on vocal and lingual function in a patient with motor speech disorder following traumatic brain injury.