Foot orientation and lower limb kinematics during running

Area of Science:

• Biomechanics
• Human Movement Science
• Sports Medicine

Background:

• Interindividual variability in foot orientation during running is a known phenomenon.
• Existing models, like Bojsen-Møller's, may not fully explain these kinematic differences.
• Understanding these variations is crucial for injury prevention and performance enhancement.

Purpose of the Study:

• To investigate the mechanisms behind interindividual differences in foot orientation during barefoot running.
• To explore the relationship between foot kinematics, pressures, and ankle joint movements.
• To evaluate the applicability of existing biomechanical models to observed running patterns.

Main Methods:

• Simultaneous recording of foot orientation, foot pressure, and ankle joint kinematics (dorsiflexion/plantarflexion).
• Data collected from 12 male subjects running barefoot at a consistent speed (3.9 m/s).
• Statistical analysis to identify significant relationships between measured variables.

Main Results:

• Forefoot abduction during running showed a significant correlation with ankle dorsiflexion and plantarflexion velocities.
• Pressure measurements were insufficient to differentiate foot lever arm variations among runners.
• The findings suggest limitations of current models in explaining observed kinematic variability.

Conclusions:

• Interindividual differences in running foot orientation are not adequately explained by foot lever arm mechanics alone, according to Bojsen-Møller's model.
• Variability in foot kinematics may be more closely linked to differences in lower limb stiffness control.
• Further research into lower limb dynamics is warranted to fully understand running foot orientation variations.