Department of Special Education and Communication Disorders


Date of this Version



Journal of Voice, Vol. 29, No. 4, 2015


U.S. Government Work


Objective: To assess subject tolerance of extended use of the VocaLogTM vocal monitor (VM), a device marketed to log calibrated decibel sound pressure level.

Study Design: Prospective between-subjects design including two age- and sex-matched groups: individuals with Parkinson disease (IWPD) and healthy persons.

Methods: After an initial session to calibrate the device and demonstrate its use, participants wore the VM during waking hours for five consecutive days. At a second visit to return the VM, participants completed a survey and a short interview regarding their experience with and perceptions of the device.

Results: Those with PD and control subjects reported relatively few issues with use of the VM. There were no group differences regarding convenience, others’ reactions, technical issues, or future participation in similar studies. Participants with PD indicated similar frequency of discomfort issues but higher severity ratings for discomfort during VM use compared with healthy participants.

Conclusions: The VocaLogTM offers a method to monitor vocal loudness during everyday activities for several consecutive days. The device was well tolerated by participants from both groups. IWPD reported greater discomfort than controls, possibly reflecting altered sensory perceptions associated with PD. The current data offer some reassurance that this VM can be tolerated by both healthy persons and those with PD for clinical and research purposes.