[Research Review] Biomechanical Analysis of the Effects of Carbon-Plated Running Shoe Bending Stiffness on Running Economy (RE): Frontiers in Exercise Physiology Research Progress (Article 775)

Reference Source: Journal of Biomechanics • International Scientific Research Findings Review Series

This article explores the biomechanical effects of the longitudinal bending stiffness of carbon-plated running shoes on running economy (RE).

How Bending Stiffness Affects Running Economy

When a carbon fiber plate is embedded in the midsole of a shoe, it restricts excessive flexion of the metatarsophalangeal (MTP) joint (the joint at the base of the big toe) during the propulsion phase. Through a mechanism similar to a “lever effect,” it reduces the mechanical work that the calf and foot muscles need to actively output during propulsion, allowing part of the propulsive energy to be provided by the elastic return of the plate. Research generally shows that carbon-plated running shoes with appropriate stiffness can lower oxygen uptake demand at the same pace, thereby improving running economy.

Stiffness Is Not Necessarily Better: Individualized Optimal Range

The relationship between bending stiffness and running economy is not linearly increasing. Excessive stiffness restricts the natural range of motion of the MTP joint, which instead increases the compensatory effort required from the calf and plantar muscles to stabilize the foot, offsetting part of the energy return benefits. Multiple studies indicate that the optimal stiffness range is related to individual body weight, foot strike pattern (forefoot/midfoot/rearfoot), and pace—there is no single universal optimal value.

Comparison of Different Stiffness Ranges and Suitable Populations (Schematic)

Core Scientific Conclusions and Practical Recommendations

• Progressive adaptation period: When transitioning from regular running shoes to carbon-plated shoes, a gradual adaptation period of 2–4 weeks is recommended to allow the calf and plantar muscles to progressively adapt to the new mechanical pattern, avoiding discomfort related to the Achilles tendon or metatarsals
• Pace-specific selection: The energy return benefits of carbon-plated shoes are more pronounced at faster paces (e.g., race pace); at slower training paces, the benefits are relatively limited, so wearing them can be decided based on training objectives
• Last and foot shape matching: The carbon plate structure restricts the natural flex of the sole; if the shoe last does not match the individual’s foot shape, discomfort may be amplified or the risk of compensatory injury may increase. It is recommended to test-run before deciding
• Integration with training plans: The benefits of carbon-plated shoes should be viewed as an auxiliary tool in training and race strategy, rather than a substitute for the necessity of foundational running technique training and strength training

Common Research Q&A (FAQ)

Q: Are carbon-plated running shoes suitable for beginners?

A: Beginners are still in the process of building their running technique and ankle strength. Wearing high-stiffness carbon-plated shoes too early may increase compensatory load. It is recommended to establish foundational running capacity first before evaluating when to introduce them.

Q: Are carbon-plated running shoes always faster than regular running shoes?

A: For most runners with a certain training foundation, carbon-plated shoes with appropriate stiffness do have the potential to improve running economy, but the actual benefit varies from person to person and is highly dependent on pace and running form—they do not guarantee faster times just by wearing them.

References and Academic Citations

1. Journal of Biomechanics — Research directions related to carbon fiber plate bending stiffness and MTP joint mechanics.
2. Sports Medicine — Literature related to running economy of carbon-plated shoes and individualized fitting.

Related Reading

• 【Research Review】Biomechanical Analysis of the Effects of Carbon-Plated Running Shoe Bending Stiffness on Running Economy (RE): Frontiers in Exercise Physiology Research Progress (Article 661)
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