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Fig. 4. 2D scatterplot of loading pattern for all loading cycles from outdoor
(grey) and treadmill (black) locomotion, showing fractional tensile strain
ratio (FTSR) plotted against tensile strain orientation (TSO) for the cranial
and caudal midshaft surfaces of both bones. Variability in pattern was greater
during outdoor, non-steady behaviors than during steady treadmill locomotion
(for descriptive statistics, see Table
2). Mean values for FTSR and TSO were nearly identical between
outdoor and treadmill conditions. On average, the radius had a significantly
higher percentage of footfalls that landed within the expected loading
zones.