The MenoStim Trial: study protocol for a randomised, sham-controlled, double-blinded, pilot clinical trial exploring the neurophysiological, cognitive, mood and biochemical effects associated with non-invasive brain stimulation during the menopause transition

INTRODUCTION: Intermittent theta-burst stimulation (iTBS) is a non-invasive brain stimulation technique that has been shown to improve cognition and mood when applied to certain brain structures and regions. Despite research demonstrating that iTBS may have clinical utility in treating cognitive and mood changes, no study has yet been conducted to explore the potential to modulate the neurophysiological changes that can underpin cognitive and mood changes during the menopause transition. Cognitive and psychological symptoms are commonly reported by females experiencing the menopause transition, and it is thought that these symptoms arise due to various neurophysiological, metabolic and endocrinological changes. Despite being common, there is a lack of treatments available for managing these symptoms and a scarcity of data regarding the mechanisms by which they occur. METHODS AND ANALYSIS: The aim of this 5-week randomised, sham-controlled, double-blinded pilot clinical trial (n=72) is to assess the underlying mechanisms of action of iTBS in females in the late menopause transition and the relationship with cognition and mood. Data will be analysed using StataTM. Normality checks will guide the choice between parametric and non-parametric tests. Generalised linear models will assess within-subject and between-subject effects across timepoints, with additional regression analyses exploring associations between biomarkers, cognition and mood. Effect sizes, CIs and relevant test statistics will be reported, with significance set at p<0.05. ETHICS AND DISSEMINATION: The study protocol has been reviewed and ethically approved by the Western Sydney University Human Research Ethics Committee (H16200; 8 November 2024). All participants will provide written informed consent prior to enrolment. Results from this trial will be disseminated via peer-reviewed publications and conference presentations, with findings shared in accordance with open science and data transparency principles.