ABSTRACT

Purpose Speech-language pathologists (SLPs) are professional voice users whose clinical duties place sustained phonatory demands on the laryngeal system throughout their workdays. However, field-based evidence on the effects of routine clinical work on vocal symptoms and laryngeal tension remains limited. This study examined pre- to post-shift changes in subjective vocal symptoms and acoustic measures associated with laryngeal tension in SLPs. Methods Twenty-seven female SLPs completed ratings for vocal effort (adapted Borg CR-10 scale), vocal fatigue, and laryngeal discomfort (5-point Likert scale) before and immediately after their work shifts. Smartphone-based voice samples were collected on-site. Fundamental frequency (F0), intensity (I), relative fundamental frequency (RFF; offset 10 and onset 1), cepstral peak prominence (CPP), CPP standard deviation (CPP SD), low-to-high spectral ratio (L/H ratio), and L/H ratio standard deviation (L/H ratio SD) were extracted and compared using paired t tests. Results All three subjective symptom ratings increased significantly after work. Among acoustic measures, F0, I, and L/H ratio increased significantly, whereas RFF offset 10 decreased significantly. No significant pre- to post-shift differences were observed in RFF onset 1, CPP, CPP SD, or L/H ratio SD. Conclusions Routine clinical work was associated with worsening vocal symptoms and acoustic changes consistent with increased laryngeal tension in SLPs. These findings underscore the importance of preventive voice care, structured recovery periods, and practical self-management strategies for SLPs exposed to high occupational vocal demands.