Cardiovascular control during exercise in type 2 diabetes mellitus

Area of Science:

• Cardiovascular Physiology
• Exercise Science
• Metabolic Disorders

Background:

• Type 2 diabetes mellitus (DM) is associated with reduced exercise capacity.
• The mechanisms underlying impaired cardiovascular function in DM during exercise require further investigation.

Purpose of the Study:

• To investigate the impact of short-duration type 2 diabetes mellitus (DM) on cardiorespiratory responses and vascular function during submaximal exercise.
• To determine the relationship between impaired vasodilation, exertional hypertension, and reduced exercise tolerance in individuals with DM.

Main Methods:

• Controlled studies involving male and female subjects with short-duration type 2 diabetes mellitus (DM).
• Assessment of peak oxygen consumption (VO2) and dynamic VO2 response during submaximal exercise.
• Measurement of exercise pressor response and vasodilation in contracting muscles.

Main Results:

• DM significantly reduced peak VO2 (12-15%) and slowed the dynamic response of pulmonary VO2 during submaximal exercise in individuals under 60.
• Exaggerated exercise pressor response and constrained vasodilation in skeletal muscles were observed during moderate exercise.
• Reduced maximum vasodilation and slowed dynamic vasodilation response were evident in individuals with DM.

Conclusions:

• Short-duration type 2 DM impairs dynamic cardiovascular control, leading to exertional hypertension and reduced exercise tolerance.
• Vascular constraints in skeletal muscles likely contribute to impaired VO2 responses and reduced exercise capacity in individuals with DM.
• Further research is needed to elucidate the roles of altered cardiovascular control and arterial stiffness in exertional hypertension in DM.