Muscle fatigue affects a lot more than tibial strain. I have seen data from a couple of projects in which lower limb and foot biomechanics are different when muscles are fatigued....sort of raises a question as to when should we being doing kinematic and kinetic studies of foot orthoses --- should subjects be fresh or fatigued?
Craig
I coudn't agree more re when we should be doing foot orthoses/ mechanics research. I always advise that practitioners should assess sports patients etc post sport. Work by Gefen and a few Japanese researchers showed that both foot and postural mechanics were changed significantly post - fatigue.
I have also seen significant foot posture index scores and navicular drop in patients pre-and post sport.
Effects of Fatigue on Running Mechanics Associated with Tibial Stress Fracture Risk.
Clansey AC, Hanlon M, Wallace ES, Lake MJ. Med Sci Sports Exerc. 2012 Apr 19.