Effects of multimodal exercise programme combined with high-protein diet on glycaemic control in older adults with type 2 diabetes mellitus: study protocol for a randomised controlled trial

Introduction Effective management of type 2 diabetes mellitus (T2DM) in older adults requires interventions that address both metabolic control and functional capacity. Exercise improves insulin sensitivity, glucose uptake and cardiometabolic health, while high-protein diets support muscle mass preservation, satiety and glycaemic regulation.

Evidence suggests that integrating structured exercise with a high-protein diet may provide additive benefits; however, research evaluating this combined approach in older adults with T2DM, particularly in low-resource settings, is limited. This study aims to determine whether a 12-week multimodal exercise programme combined with a high-protein diet improves glycaemic control and broader health outcomes compared with exercise alone.

Methods and analysis In this randomised controlled trial (RCT), 140 adults aged ≥60 years with T2DM will be allocated 1:1 to an experimental group (multimodal exercise with high-protein diet, n=70) or a control group (multimodal exercise alone, n=70). All participants will engage in three supervised exercise sessions per week for 12 weeks.

Additionally, the experimental group will follow a high-protein diet that provides approximately 30% of total energy from protein, with a 500-kcal daily energy deficit.