Changes in leg spring behaviour, plantar loading and foot mobility magnitude induced by an exhaustive treadmill run in adolescent middle-distance runners

Fourchet, François, Girard, Olivier, Kelly, Luke, Horobeanu, Cosmin and Millet, Grégoire P. (2015) Changes in leg spring behaviour, plantar loading and foot mobility magnitude induced by an exhaustive treadmill run in adolescent middle-distance runners. Journal of Science and Medicine in Sport, 18 2: 199-203. doi:10.1016/j.jsams.2014.01.007


Author Fourchet, François
Girard, Olivier
Kelly, Luke
Horobeanu, Cosmin
Millet, Grégoire P.
Title Changes in leg spring behaviour, plantar loading and foot mobility magnitude induced by an exhaustive treadmill run in adolescent middle-distance runners
Journal name Journal of Science and Medicine in Sport   Check publisher's open access policy
ISSN 1440-2440
1878-1861
Publication date 2015-03
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jsams.2014.01.007
Open Access Status
Volume 18
Issue 2
Start page 199
End page 203
Total pages 5
Place of publication Chatswood, NSW, Australia
Publisher Elsevier Australia
Language eng
Formatted abstract
Objectives
This study aimed to determine adjustments in spring–mass model characteristics, plantar loading and foot mobility induced by an exhaustive run.

Design
Within-participants repeated measures.

Methods
Eleven highly-trained adolescent middle-distance runners ran to exhaustion on a treadmill at a constant velocity corresponding to 95% of velocity associated with VO2max (17.8 ± 1.4 km h−1, time to exhaustion = 8.8 ± 3.4 min). Contact time obtained from plantar pressure sensors was used to estimate spring–mass model characteristics, which were recorded (during 30 s) 1 min after the start and prior to exhaustion using pressure insoles. Foot mobility magnitude (a composite measure of vertical and medial–lateral mobility of the midfoot) was measured before and after the run.

Results
Mean contact area (foot to ground), contact time, peak vertical ground reaction force, centre of mass vertical displacement and leg compression increased significantly with fatigue, while flight time, leg stiffness and mean pressure decreased. Leg stiffness decreased because leg compression increased to a larger extent than peak vertical ground reaction forces. Step length, step frequency and foot mobility magnitude did not change at exhaustion.

Conclusions
The stride pattern of adolescents when running on a treadmill at high constant velocity deteriorates near exhaustion, as evidenced by impaired leg-spring behaviour (leg stiffness) and altered plantar loading.
Keyword Fatigue
Spring mass model
Stride mechanics
Medial arch
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Human Movement and Nutrition Sciences Publications
 
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Created: Mon, 09 Mar 2015, 15:45:00 EST by Sandrine Ducrot on behalf of School of Human Movement and Nutrition Sciences