SECTION I - KINESIOLOGY / RESEARCH PAPER
Habitual Running Style Matters: Duty Factor,
and Not Stride Frequency, Relates to Loading Magnitude
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1
Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium.
2
Department of Movement and Sports Sciences, Vrije Universiteit Brussel, Brussels, Belgium.
Submission date: 2024-01-11
Final revision date: 2024-04-24
Acceptance date: 2024-07-23
Online publication date: 2024-09-26
Corresponding author
Lennert Van der Meulen
Department of Movement and Sports Sciences, Research Unit Biomechanics and Motor Control of Human Movement, Ghent University, Belgium
KEYWORDS
TOPICS
ABSTRACT
Running style is temporally defined by a duty factor and stride frequency and believed to be related to the loading experienced during ever step. However, the exact relationship between both temporal variables and loading magnitude is still unknown. We aimed to identify the relationship between a duty factor and stride frequency with external load measures, joint reaction forces and joint moments. Thirty-one healthy female recreational runners ran across a 25-m runway at a speed of 2.30 ± 0.05 m∙s−1. Ground reaction forces and motion capture data were used to determine the maximal vertical ground reaction force, the vertical instantaneous loading rate, peak braking force, peak joint extension moments and peak joint reaction forces at the knee and the ankle. The habitual duty factor and stride frequency of runners did not correlate with each other. The duty factor was found to be a significant predictor of maximal vertical ground reaction force (R2 = 0.585), peak braking force (R2 = 0.153), peak knee extension moment (R2 = 0.149), ankle plantar flexion moment (R2 = 0.225) and peak joint reaction forces at the knee (R2 = 0.591) and the ankle (R2 = 0.592), but not of the vertical instantaneous loading rate. Stride frequency had no significant predictive value. In conclusion, the maximal loading and potential injury risk of female recreational runners running with high duty factors are lower compared to those of peers running with lower duty factors.
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