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Fig. 6. Mean values of the mechanical power (A,B) and sagittal plane joint moment (C,D) at the ankle (A,C) and knee joint (B,D), and vertical (E) and horizontal (F) ground reaction force (GRF) of the left leg during running (2.7 m s–1) for the examined groups. O, older adults; Y, young adults. The x-axis was normalised as follows: 0% to 100%, ground contact.