The Shoes Changed. The Biology Didn’t: What Modern Running Footwear Still Gets Wrong

The ideas in this article grew out of doctoral research conducted by Dr Devon Coetzee over eight years, between 2012 and 2020. At the time, the scientific questions centred on minimalist footwear, injury, and running biomechanics. While footwear trends have evolved, the questions asked, and the mechanisms uncovered, remain highly relevant. This article draws on that body of work to help make sense of modern running shoes and how their structure influences load, adaptation, and injury risk.

If you listen to today’s running conversations, you’d think the footwear debate has been settled.

What the Minimalist Era Still Teaches Us About Modern Running Footwear

Carbon plates are fast. Cushioning is protective. Shoes are more advanced than ever. The science, we’re told, has moved on. And in many ways, it has.

But something interesting has happened at the same time. Injury rates among recreational runners haven’t meaningfully declined. Tendon problems are still everywhere. And athletes are cycling through shoes faster than their tissues can possibly adapt.

At Science to Sport, this raises an uncomfortable but important question:
If footwear technology has advanced so dramatically, why does injury look so familiar?

To answer that, we need to revisit a period of research that many assume is outdated, but whose insights quietly underpin how modern shoes work.

The Minimalist Debate was Never About Shoes

At face value, the minimalist footwear era looked like a fight over cushioning, heel drop, and barefoot running. But beneath the noise, the science was never really about which shoe was “better.”

It was about how footwear structure alters mechanical load.

Dr Devon Coetzee’s research approached footwear not as a lifestyle choice, but as a mechanical intervention. Shoes were defined not by marketing categories, but by measurable properties: stack height, stiffness, mass, geometry, and motion control.

That framework turned out to be its greatest contribution, because those same variables now define the super-shoes dominating start lines worldwide.

The shoes changed. The principles didn’t.

Footwear as a Load-Shifting Device

Every running shoe redistributes force. The only question is where that force goes.

Minimalist shoes tended to shift load toward the foot, ankle, and Achilles tendon. Highly cushioned, stiff shoes tend to do the opposite, reducing some local loads while increasing others, often at the knee or hip, or altering how elastic energy is stored and released.

Carbon plates, for example, increase longitudinal bending stiffness. This changes how the foot functions as a lever, how the ankle plantar flexors contribute to propulsion, and how energy is transferred through the kinetic chain.

From a performance standpoint, this can be advantageous. From an adaptation standpoint, it’s a change in demand.

The mistake runners make is assuming that reduced sensation or increased comfort equals reduced injury risk. Comfort is a sensory signal. Tissue capacity is a biological one.

They are not the same thing.

Why Modern Shoes Can Create Old Injuries

Highly cushioned shoes excel at attenuating impact-related sensations. But connective tissue doesn’t adapt based on sensation, it adapts based on strain history.

When footwear reduces discomfort, runners often:

• Increase volume
• Increase intensity
• Recover faster subjectively
• Stack hard sessions closer together

Cardiovascularly, this often works. Tendons, however, don’t read pace charts or race results. They respond to cumulative mechanical load over time.

This is the same adaptation mismatch described in tendon research and injury epidemiology. Only now, instead of minimalist shoes exposing load early, maximalist shoes may mask it until tissues are already overloaded.

Different mechanism. Same outcome.

What the Thesis Still Gets Right, And Why It Matters Now

The enduring value of Dr Devon Coetzee’s work isn’t in promoting or rejecting a shoe type. It’s in how it teaches us to think.

Three concepts remain especially relevant:

1. Footwear exists on a spectrum, not in categories: Modern shoes blend features once considered opposites: high cushioning with low drop, stiffness with flexibility, guidance without overt motion control. Binary labels fail here. Structural characteristics matter more than names.
2. Changing shoes is changing load: Any meaningful footwear change alters joint moments, muscle activation patterns, and tendon strain distribution. That demands adaptation time, regardless of whether the change is toward “minimal” or “maximal.”
3. Injury risk is about rate of change, not shoe type: The research consistently points to one risk factor that transcends footwear fashion: rapid shifts in mechanical demand without adequate preparation.

This is why injury spikes often occur after shoe upgrades, race blocks, or sudden confidence gains, not because the shoe is bad, but because progression wasn’t respected.

How Informed Runners Should Think About Shoes Today

The modern footwear question isn’t “Is this shoe protective?”
It’s “Protective of what, and at what cost?”

At Science to Sport, our coaches treat footwear like training load:

• Carbon-plated shoes are powerful tools but best introduced gradually and strategically.
• Highly cushioned shoes can reduce perceived stress but may encourage volumes tissues aren’t ready for.
• Rotating shoes isn’t about novelty; it’s about distributing load across tissues.

The goal isn’t to find the perfect shoe. It’s to align footwear choice with training phase, tissue capacity, and adaptation timelines.

The Quiet Advantage

The minimalist era taught us something valuable: when science strips away marketing, what remains is mechanics, biology, and time.

Those truths didn’t disappear when carbon plates arrived. If anything, they became more important.

The runners who stay healthy aren’t the ones chasing technology. They’re the ones who understand what it changes, and respect how long the body takes to keep up.

And that might be the most modern lesson of all.