Effects of Hourly Stair-Climbing Exercise Snacks on Metabolic and Vascular Health in Adults With Prediabetes

This study will examine whether very short bouts of stair climbing performed throughout the day can improve blood sugar control and cardiovascular health in adults with prediabetes. Participants will complete three separate study visits in random order: uninterrupted sitting, sitting interrupted by 3-minute light walking breaks each hour, and sitting interrupted by brief stair-climbing exercise \"snacks\" each hour. During each visit, the research team will measure glucose, insulin, blood lipids, markers of inflammation and oxidative stress, and blood-vessel function. Continuous glucose monitors, blood samples, heart-rate and blood-pressure measurements, vascular ultrasound, and questionnaires will be used to assess the participants\' responses. The goal of the study is to determine whether brief stair-climbing breaks may be a practical way to reduce the negative effects of prolonged sitting and improve metabolic health in adults with prediabetes.