The main aim is to determine whether a gait retraining intervention will improve the strength of the foot-ankle muscle, the running economy and reduce the injury incidence in a one-year follow-up study. The secondary aim is to seek whether a minimal foot-ankle strength is necessary to reduce the risk to sustain to a running-related-injury to transit toward a forefoot strike pattern or toward a minimalist footwear for an endurance runner. Participants will be assessed at baseline, at 2 month follow-up, at 6 month follow-up and at 12 month follow-up. Assessment will be composed by questionnaires, a foot screening, maximal voluntary isometric strength of foot-ankle muscle with hand held dynamometer. Then, participants will run on a treadmill at self-paced and at 10 km/h with to measure their running economy and their footstrike pattern. In function of their distribution, participants will receive either nothing (control group) or minimalist footwear or a training to modify their footstrike pattern toward a more forefoot strike.
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Change in foot-ankle strength
Timeframe: Change from Baseline foot-ankle strength at 2 month follow-up, Change from Baseline foot-ankle strength at 6 month follow-up, Change from Baseline foot-ankle strength at 12 month follow-up
Change in running economy
Timeframe: Change from Baseline running-economy at 2 month follow-up, Change from Baseline running economy at 6 month follow-up, Change from Baseline running economy at 12 month follow-up
Running-related-injuries
Timeframe: At any time during the 12 month follow-up