[Research Review] Biomechanical Analysis of the Effects of Carbon-Plated Running Shoe Bending Stiffness on Running Economy (RE): Frontiers in Exercise Physiology Research Progress (No. 1297)

Reference Journal 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

After the carbon fiber plate is embedded in the midsole, it limits 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, with part of the propulsion energy instead provided by the elastic return of the shoe 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 Higher Is 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 additional compensatory force 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 Research Conclusions and Practical Recommendations

• Progressive adaptation period: When transitioning from regular running shoes to carbon-plated shoes, a 2–4 week progressive adaptation period is recommended to allow the calf and plantar muscles to gradually adapt to the new mechanical pattern, avoiding Achilles tendon or metatarsal-related discomfort
• 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 purpose
• Last and foot shape matching: The carbon plate structure restricts the natural flex of the outsole; if the shoe last does not match the individual’s foot shape, it may amplify discomfort or increase the risk of compensatory injuries—a trial run is recommended before deciding
• Integration with training plans: The benefits of carbon-plated shoes should be viewed as an auxiliary tool within training and race strategy, rather than replacing 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’ running technique and ankle strength are still in the developmental stage. Wearing high-stiffness carbon-plated shoes too early may increase compensatory load. It is recommended to build foundational running capacity first before evaluating when to introduce them.

Q: Are carbon-plated running shoes definitely 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 correlated with 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 metatarsophalangeal joint mechanics.
2. Sports Medicine — Literature related to running economy of carbon-plated running shoes and individualized fitting.

Further 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 (No. 319)
• 【Research Review】Biomechanical Analysis of the Effects of Carbon-Plated Running Shoe Bending Stiffness on Running Economy (RE): Frontiers in Exercise Physiology Research Progress (No. 1108)
• 【Research Review】Biomechanical Analysis of the Effects of Carbon-Plated Running Shoe Bending Stiffness on Running Economy (RE): Frontiers in Exercise Physiology Research Progress (No. 661)
• 【Research Review】Biomechanical Analysis of the Effects of Carbon-Plated Running Shoe Bending Stiffness on Running Economy (RE): Frontiers in Exercise Physiology Research Progress (No. 775)