Daijiworld Media Network - London
London, Nov 6: Exercise training could support the management of diabetic cardiomyopathy, particularly during its early stages, although stronger clinical evidence is needed to establish the most effective exercise programmes and their long-term cardiovascular benefits, according to a new review.
The narrative review brings together experimental and clinical research examining the effects of exercise on diabetes-associated heart muscle dysfunction. It highlights promising biological mechanisms and improvements in certain clinical measures while pointing out significant gaps between laboratory findings and their application in routine medical care.
Diabetic cardiomyopathy involves changes in heart muscle metabolism, fibrosis, disrupted calcium handling and ventricular remodelling. Treatment strategies capable of reversing established cardiac damage remain limited.
The review examined how exercise could influence these processes. Experimental studies suggest that regular training may improve mitochondrial function and the heart's ability to use different energy sources, while reducing oxidative stress and inflammatory signalling associated with fibrosis.
Other possible benefits include improved calcium regulation and changes in biological pathways linked to cell death. Together, these findings provide a scientific basis for considering exercise as part of diabetic cardiomyopathy management.
However, the researchers cautioned that experimental findings alone cannot establish the extent or durability of benefits in patients. A plausible biological mechanism does not necessarily translate into a proven clinical benefit.
The clinical evidence reviewed came largely from people with Type 2 diabetes who had early or subclinical cardiac abnormalities, rather than clearly defined groups of patients with established diabetic cardiomyopathy.
Among the interventions examined, combined aerobic and resistance training showed potential to improve cardiorespiratory fitness, insulin sensitivity, vascular function and certain measures of left ventricular performance.
High-intensity interval training may provide additional benefits for appropriately selected patients. However, its safety and effectiveness require individual assessment, making a uniform exercise prescription unsuitable for everyone.
The review also highlighted differences in exercise protocols and inconsistent reporting of training intensity and duration, making it difficult to compare the effectiveness of different programmes.
The authors called for more consistent reporting of exercise intensity using physiologically comparable measurements. They also recommended evaluating treatment outcomes across several areas, including cardiac imaging, functional capacity, biomarkers, blood sugar control and adverse events.
Such a comprehensive approach would help researchers distinguish improvements in physical fitness and metabolic health from actual changes in heart function, while ensuring that potential safety concerns are properly assessed.
The researchers stressed the need for adequately powered clinical trials involving clearly defined patient groups to determine the optimal exercise intensity, duration and frequency, as well as the long-term cardiovascular benefits.
The review concludes that exercise is a promising additional approach to managing diabetic cardiomyopathy, particularly in its early stages. However, its precise role in treating established disease and its long-term effectiveness remain to be established.