The body doesn’t lie—when physiology changes, function follows.
Introduction
When we think about diabetes, we often picture glucose levels, insulin, and the classic complications—nerve damage, kidney disease, vision loss. But what if the condition also quietly reshapes how we move every day? A recent study by Petrovic et al. sheds light on a lesser-known consequence of diabetic neuropathy: impaired tendon mechanics, particularly in the Achilles tendon, during walking. This discovery doesn’t just add a new layer to diabetes management—it challenges how we approach rehab and movement training in these patients.
Function Follows Physiology
The Achilles tendon plays a vital role in walking by acting like a spring—storing elastic energy when your foot hits the ground and releasing it as you push off. But in individuals with diabetic neuropathy, this elegant process is disrupted.
Here’s what Petrovic’s study revealed:
- Increased tendon stiffness: Tendons are supposed to stretch and recoil, but stiffness limits that function, reducing fluid movement and shock absorption.
- Reduced energy storage and return: The tendon’s ability to act like a spring is diminished. Instead of rebounding with ease, it’s more like a rigid cable—less energy-efficient and less adaptive to movement demands.
- Higher hysteresis: More energy is lost as heat rather than being recycled into forward motion. This “energy leak” makes walking more fatiguing and less biomechanically efficient.
- Greater muscular workload: Because the tendon isn’t doing its job as a passive energy recycler, muscles have to work harder to compensate—resulting in quicker fatigue and reduced gait endurance.
Why It Matters in Rehab
These changes aren’t just biomechanical trivia—they have real implications for daily function and rehabilitation. Patients with diabetes may struggle more with walking not only due to neuropathy but because their tendons are working against them.
A few clinical considerations:
- Rehab plans should address muscle endurance and coordination since tendons can’t carry as much of the load.
- Incorporating eccentric loading and mobility-focused exercises may help improve tendon elasticity over time.
- Therapies aimed at improving metabolic health—like nutrition, glycemic control, and aerobic conditioning—may indirectly benefit tendon function.
Conclusion
Tendons may not be the first structure we think of when managing diabetes, but they are a crucial link in the movement chain. The phrase “function follows physiology” reminds us that even subtle metabolic changes can ripple through the body in profound ways. By better understanding and addressing tendon dysfunction in diabetic patients, we can design smarter, more supportive rehabilitation plans—ones that truly meet patients where they are, structurally and metabolically.
People with diabetic neuropathy: implications for metabolic energy saving. Journal of applied physiology. 2018 May 1;124(5):1333-40.
Fong, D. T.-P., et al. (2022). “Metabolic Dysfunction and Tendon Health: Mechanisms and Clinical Implications.” Journal of Clinical Medicine, 11(6), 1666.