Interaction effects of stride angle and strike pattern on running economy

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Science

Background:

• Running economy (RE) is a key determinant of endurance performance.
• Foot strike pattern is a significant biomechanical variable influencing running efficiency.
• The relationship between stride angle and running economy across different foot strike patterns requires further investigation.

Purpose of the Study:

• To investigate the association between stride angle and running economy (RE) in male runners.
• To compare running economy and stride angle between midfoot/forefoot strikers and rearfoot strikers.
• To determine the predictive value of stride angle on running economy.

Main Methods:

• Thirty male runners performed 4-minute running stages on a treadmill at various velocities.
• Biomechanical variables, including stride angle, were measured using an optical system.
• Foot strike pattern was identified, and oxygen consumption (VO2) was measured to calculate RE.

Main Results:

• Midfoot/forefoot strikers demonstrated significantly better running economy (201.5±5.6 ml·kg⁻¹·km⁻¹) than rearfoot strikers (213.5±4.2 ml·kg⁻¹·km⁻¹).
• Midfoot/forefoot strikers exhibited larger stride angles compared to rearfoot strikers (p=0.043).
• Linear modeling revealed a strong correlation between stride angle and running economy (r=0.62, p<0.001).

Conclusions:

• A biomechanical running technique with high stride angles and a midfoot/forefoot strike pattern is advantageous for improved running economy.
• Stride angle is a critical factor influencing running economy, with optimal angles varying by foot strike pattern.
• Athletes can potentially improve their running economy by modifying their stride angle and foot strike pattern.