Figure 1
Representative tibial cartilage thickness maps (superior-inferior perspective of axial view of left knee) for the first protocol (top row; increasing walk duration) and for the second protocol (bottom row; increasing normalized walking speed); increased duration and increased normalized speed each resulted in decreased cartilage thickness compared to the baseline resting state, with thickness changes leveling off with longer walk durations. Averaged across all volunteers, pre-exercise (baseline) cartilage thickness was 2.5 ± 0.3 mm (mean ± 95% confidence interval), 2.1 ± 1.8 mm, and 3.0 ± 2.6 mm across the entire tibial plateau, the medial plateau, and the lateral plateau, respectively.
