[Research Review] Biomechanical Analysis of the Effects of Carbon-Plate Shoe Bending Stiffness on Running Economy (RE): A Study of Elite Athlete Physiological Characteristics (Article 763)

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

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

How Bending Stiffness Affects Running Economy

When a 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 must actively output during propulsion, with part of the propulsive energy instead provided by the elastic return of the plate. Research generally shows that carbon-plate shoes with appropriate stiffness can lower oxygen uptake demand at the same pace, thereby improving running economy.

Stiffness Is Not Always 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 force required from the calf and plantar muscles to stabilize the foot, offsetting part of the energy return benefit. 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 Stiffness Ranges and Target Populations (Schematic)

Core Scientific Conclusions and Practical Recommendations

• Progressive adaptation period: When transitioning from regular shoes to carbon-plate shoes, a 2–4 week progressive adaptation period is recommended to allow the calf and plantar muscles to gradually adjust to the new mechanical pattern, avoiding Achilles tendon or metatarsal-related discomfort
• Pace-specific selection: The energy return benefit of carbon-plate shoes is more pronounced at faster paces (e.g., race pace); at slower training paces the benefit is relatively limited, so selection can be 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, 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-plate 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-plate shoes suitable for beginners?

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

Q: Are carbon-plate shoes definitely faster than regular shoes?

A: For most runners with a certain training foundation, carbon-plate 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—wearing them does not guarantee being faster.

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-plate shoes and individualized fitting.

Related Reading

• Research Review: Biomechanical Analysis of the Effects of Carbon-Plate Shoe Bending Stiffness on Running Economy (RE): A Study of Elite Athlete Physiological Characteristics (Article 838)
• Research Review: Biomechanical Analysis of the Effects of Carbon-Plate Shoe Bending Stiffness on Running Economy (RE): A Study of Elite Athlete Physiological Characteristics (Article 154)
• Research Review: Biomechanical Analysis of the Effects of Carbon-Plate Shoe Bending Stiffness on Running Economy (RE): A Study of Elite Athlete Physiological Characteristics (Article 871)
• Research Review: Biomechanical Analysis of the Effects of Carbon-Plate Shoe Bending Stiffness on Running Economy (RE): A Study of Elite Athlete Physiological Characteristics (Article 709)