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European Journal of Applied Physiology

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Open Access 01-09-2020 | Fatigue | Original Article

Custom foot orthoses improve performance, but do not modify the biomechanical manifestation of fatigue, during repeated treadmill sprints

Authors: Olivier Girard, Jean-Benoit Morin, Joong Hyun Ryu, Ken Van Alsenoy

Published in: European Journal of Applied Physiology | Issue 9/2020

Abstract

Purpose

We determined the effect of custom foot orthotics manufactured from ethyl-vinyl acetate (EVA) and expanded thermoplastic polyurethane (TPU) materials, both compared to a control condition (CON; shoes only) during repeated sprints on running mechanical alterations.

Methods

Eighteen males performed eight, 5-s sprints with 25-s recovery on an instrumented sprint treadmill in three footwear conditions (EVA, TPU and CON). Mechanical data consisted of continuous (step-by-step) measurement of running kinetics and kinematics, which were averaged for each sprint for further analysis.

Results

Distance ran in 5 s decreased from first to last sprint (P < 0.001), yet with higher sprints 1–8 values for both EVA (P = 0.004) and TPU (P = 0.018) versus CON. Regardless of footwear condition, mean horizontal forces, step frequency, vertical and leg stiffness decreased from sprint 1 to sprint 8 (all P < 0.001). Duration of the propulsive phase was globally shorter for both EVA (P = 0.002) and TPU (P = 0.021) versus CON, while braking phase duration was similar (P = 0.919). In the horizontal direction, peak propulsive (P < 0.001), but not braking (P = 0.172), forces also decreased from sprint 1 to sprint 8, independently of conditions.

Conclusion

Compared to shoe only, wearing EVA or TPU custom foot orthotics improved repeated treadmill sprint ability, yet provided similar fatigue-induced changes in mechanical outcomes.

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Title: Custom foot orthoses improve performance, but do not modify the biomechanical manifestation of fatigue, during repeated treadmill sprints
Authors: Olivier Girard
Jean-Benoit Morin
Joong Hyun Ryu
Ken Van Alsenoy
Publication date: 01-09-2020
Publisher: Springer Berlin Heidelberg
Keyword: Fatigue
Published in: European Journal of Applied Physiology / Issue 9/2020
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-020-04427-0

At a glance: The STEP trials

Springer Medicine

Custom foot orthoses improve performance, but do not modify the biomechanical manifestation of fatigue, during repeated treadmill sprints

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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