Duty Factor Is a Viable Measure to Classify Spontaneous Running Forms.
Aurélien Patoz1, Cyrille Gindre1, Adrien Thouvenot2,3
1Research and Development Department, Volodalen Swiss SportLab, 1860 Aigle, Switzerland.
Sports (Basel, Switzerland)
|November 14, 2019
Summary
The study found that the duty factor (DF) and Volodalen V®score provide similar classifications of running form. Objective DF measurements can monitor spontaneous running technique changes, potentially indicating fatigue or environmental shifts.
Area of Science:
- Biomechanics
- Sports Science
- Running Dynamics
Background:
- Classifying running form is crucial for performance and injury prevention.
- Subjective (Volodalen V®score) and objective (duty factor) methods exist but require comparison.
- Understanding spontaneous running form changes is key to runner analysis.
Purpose of the Study:
- To compare the Volodalen V®score (subjective) and duty factor (objective) for classifying spontaneous running form.
- To determine the agreement between these two classification methods in runners.
- To assess the utility of duty factor as an objective measure for real-time running form analysis.
Main Methods:
- Eighty-nine runners were classified using the Volodalen V®score (terrestrial/aerial) and duty factor (DFhigh/DFlow).
- Running kinematics were recorded using 3D motion capture on a treadmill at 12 km·h⁻¹.
- Duty factor was calculated as the ratio of ground contact time to stride time.
Main Results:
- A high agreement (79.8%) was found between the Volodalen V®score and duty factor classifications.
- Sensitivity (81.6%) and specificity (77.5%) indicated good concordance between the methods.
- Specific duty factor thresholds were identified for aerial (<27.6%) and terrestrial (>28.8%) running at 12 km·h⁻¹.
Conclusions:
- The duty factor and Volodalen V®score reflect similar aspects of spontaneous running form.
- Duty factor offers a reliable, objective method for real-time running form assessment, potentially via wearable tech.
- Monitoring spontaneous running form changes can provide insights into fatigue and environmental influences on runners.
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