This preliminary randomized clinical trial examined a specific electrical therapy called low-frequency TENS. The study focused on women who have vocal nodules, which are benign growths on the vocal cords. Participants received the therapy at the same time they performed vocal exercises. A placebo treatment was used for comparison during the same sessions.
The researchers measured several voice characteristics immediately after the therapy sessions. They found that the low-frequency TENS group showed improvements in vocal quality and self-assessment scores compared to the placebo group. Specific measures included changes in fundamental frequency and other acoustic indicators of voice health.
No adverse events or safety concerns were reported in this small group of twelve women. However, the study has important limitations. The sample size was very small, and the results are considered preliminary. Because of these factors, the findings should be viewed as early evidence rather than proof of a standard treatment. More research is needed before this approach can be widely recommended for patients.