Running kinematics, spatiotemporal variation and lower limb strength at different stages of a 156-km ultra-trail race. - Nguyen AP; Esculier JF; Dubois B; VAN Cant J; Roy-Baillargeon O; Hebert-Losier K; Francisco B; Hingrand C; Delaunay PL; Mauvieux B; Pairot DE Fontenay B (The Journal of sports medicine and physical fitness, 2026)