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Fig. 6. Within-individual variability in loading pattern in terms of (A) variance
in tensile strain orientation (TSO; normalized to 90°) and (B) variance in
fractional tensile strain ratio (FTSR). Values are shown when outdoor (grey)
and treadmill (black) data for the cranial and caudal surfaces of both bones
were available for an individual. In most of the within-individual comparisons
(TSO: 3 of 5 metacarpus, 8 of 9 radius; FTSR: 4 of 5 metacarpus, 8 of 9
radius), the variance in these dimensions during outdoor locomotion is
significantly greater than during treadmill locomotion
(*significant difference in variances, according to
F-tests). (C) Variance in TSO averaged across individuals for the
cranial and caudal surfaces of each bone was not significantly different
between the metacarpus (MC) and radius (Rad) for either experimental
condition. (D) Variance in FTSR averaged across individuals for the cranial
and caudal surfaces was low and not significantly different between bones
during treadmill locomotion, but was significantly lower (P=0.037) in
the radius during outdoor locomotion.
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