High-intensity running and lantar-flexor fatigability and plantar-pressure distribution in adolescent runners

Fourchet, Francois, Kelly, Luke, Horobeanu, Cosmin, Loepelt, Heiko, Taiar, Redha and Millet, Gregoire (2015) High-intensity running and lantar-flexor fatigability and plantar-pressure distribution in adolescent runners. Journal of Athletic Training, 50 2: 117-125. doi:10.4085/1062-6050-49.3.90

Author Fourchet, Francois
Kelly, Luke
Horobeanu, Cosmin
Loepelt, Heiko
Taiar, Redha
Millet, Gregoire
Title High-intensity running and lantar-flexor fatigability and plantar-pressure distribution in adolescent runners
Journal name Journal of Athletic Training   Check publisher's open access policy
ISSN 1062-6050
Publication date 2015-02-01
Year available 2015
Sub-type Article (original research)
DOI 10.4085/1062-6050-49.3.90
Open Access Status DOI
Volume 50
Issue 2
Start page 117
End page 125
Total pages 9
Place of publication Lawrence, KS United States
Publisher National Athletic Trainers Association
Language eng
Formatted abstract
Context: Fatigue-induced alterations in foot mechanics may lead to structural overload and injury.

Objectives: To investigate how a high-intensity running exercise to exhaustion modifies ankle plantar-flexor and dorsiflexor strength and fatigability, as well as plantar-pressure distribution in adolescent runners.

Design: Controlled laboratory study.

Setting: Academy research laboratory.

Patients or Other Participants: Eleven male adolescent distance runners (age = 16.9 ± 2.0 years, height = 170.6 ± 10.9 cm, mass = 54.6 ± 8.6 kg) were tested.

Intervention(s): All participants performed an exhausting run on a treadmill. An isokinetic plantar-flexor and dorsiflexor maximal-strength test and a fatigue test were performed before and after the exhausting run. Plantar-pressure distribution was assessed at the beginning and end of the exhausting run.

Main Outcome Measure(s): We recorded plantar-flexor and dorsiflexor peak torques and calculated the fatigue index. Plantar-pressure measurements were recorded 1 minute after the start of the run and before exhaustion. Plantar variables (ie, mean area, contact time, mean pressure, relative load) were determined for 9 selected regions.

Results: Isokinetic peak torques were similar before and after the run in both muscle groups, whereas the fatigue index increased in plantar flexion (28.1%; P = .01) but not in dorsiflexion. For the whole foot, mean pressure decreased from 1 minute to the end (−3.4%; P = .003); however, mean area (9.5%; P = .005) and relative load (7.2%; P = .009) increased under the medial midfoot, and contact time increased under the central forefoot (8.3%; P = .01) and the lesser toes (8.9%; P = .008).

Conclusions: Fatigue resistance in the plantar flexors declined after a high-intensity running bout performed by adolescent male distance runners. This phenomenon was associated with increased loading under the medial arch in the fatigued state but without any excessive pronation.
Keyword Ankle
Medial longitudinal arch
Isokinetic exercise
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: Tue, 10 Mar 2015, 01:58:43 EST by Sandrine Ducrot on behalf of School of Human Movement and Nutrition Sciences