Peripheral artery disease and diabetes: the benefits of exercise for walking remain uncertain

A review focused on patients with diabetes

Peripheral artery disease affects walking ability and increases the risk of amputation. Diabetes contributes to its progression, but its influence on the response to exercise and diet remains poorly defined.

The authors searched five bibliographic databases for human studies. Of the 18 studies included, 15 focused on exercise and three on links between diet and peripheral artery disease in patients with diabetes. The abstract consulted does not specify the total sample size, intervention durations or comparators for each study.

Distinguishing vascular indicators from walking ability

The review reports improvements in the ankle-brachial index and blood flow velocity with supervised or home-based exercise programmes. However, these findings are based on evidence of very low to moderate certainty.

For walking, the findings are less convincing. Six-minute walking distance, maximum walking times and distances, and time to onset of claudication show no statistically significant improvement or yield conflicting results across studies.

This discrepancy limits the practical implications of the findings: a favourable change in a vascular indicator is not enough to establish a functional benefit. Conversely, these uncertain data do not demonstrate that exercise is ineffective.

The Mediterranean diet: an association, not established effectiveness

The three studies on diet suggest favourable associations between adherence to a Mediterranean diet, blood circulation, intermittent claudication and the risk of developing peripheral artery disease.

The certainty of the evidence is low. These associations do not establish that this diet causes the observed benefits, nor do they support a specific prescription for patients with diabetes and peripheral artery disease.

What this review tells us

The value of this review lies in separating vascular measures from outcomes that directly matter for mobility. Above all, it highlights uncertainty about the size of functional benefits in this population.

Small sample sizes, the limited number of studies, risks of bias and conflicting results prevent an optimal programme from being defined. This review therefore justifies neither abandoning exercise nor promising a predictable improvement in walking.

What we can take away

In patients with diabetes and peripheral artery disease, exercise appears to improve some circulatory indicators, but its benefits for walking remain uncertain.