Table 1.

Summary of key parameters. Data are presented at mean ± s.d. for all parameters except initial d-period and variance, which are presented as median ± interquartile range.

body weight (g)area (mm2)maximum stress (MPa)stress relaxation (%)cycles to failure
WT30.3 ± 3.7a,b0.13 ± 0.03a,b34.6 ± 9.9a35.5 ± 6.15336 ± 2849b
HET28.7 ± 3.0a0.12 ± 0.02a33.2 ± 11.5a39.5 ± 6.03117 ± 2068
NULL18.2 ± 2.60.10 ± 0.0313.9 ± 3.950.4 ± 9.91988 ± 1436
dynamic modulus (MPa)tangent deltatangent stiffness (N mm–1)peak cyclic strain (%)hysteresis (MPa mm mm–1)
WT194.8 ± 65.2a0.04 ± 0.01a17.8 ± 1.3a,b1.4 ± 0.20.03 ± 0.01a
HET160.4 ± 89.30.05 ± 0.01a18.7 ± 1.6a1.4 ± 0.1a0.03 ± 0.008a
NULL118.1 ± 52.00.06 ± 0.0110.6 ± 1.31.5 ± 0.20.008 ± 0.003
transition strain (%)transition stress (MPa)toe modulus (MPa)linear modulus (MPa)initial d-period (nm)
WT
 INS5.3 ± 1.92.7 ± 1.5a115.6 ± 64.9a887.0 ± 435.3a,b61.7 ± 2.7b
 MID4.3 ± 2.42.3 ± 1.8122.3 ± 80.1a,b713.7 ± 488.13a62.0 ± 2.5b
HET
 INS4.8 ± 1.31.8 ± 1.095.0 ± 46.4616.9 ± 234.6a62.5 ± 3.7a
 MID5.0 ± 2.01.9 ± 2.066.5 ± 68.6549.3 ± 309.1a61.3 ± 2.9a
NULL
 INS5.0 ± 2.01.2 ± 1.053.1 ± 37.9315.4 ± 183.562.0 ± 3.0
 MID5.5 ± 3.61.2 ± 1.041.8 ± 29.1250.1 ± 106.462.2 ± 2.7
toe region re-alignmentlinear region re-alignmentstrain required to full re-align (%)amount of re-alignmentinitial variance (nm2)
WT
 INS1.1 ± 0.70.9 ± 0.5a,b5.2 ± 1.54.1 ± 1.4a2.2 ± 1.0
 MID0.7 ± 0.70.5 ± 0.5a5.9 ± 2.1a2.4 ± 0.82.5 ± 1.6
HET
 INS0.9 ± 0.50.4 ± 0.55.5 ± 1.63.8 ± 1.14.3 ± 2.5
 MID0.9 ± 0.80.7 ± 0.85.4 ± 1.5a2.2 ± 1.02.9 ± 1.0
NULL
 INS0.5 ± 0.90.2 ± 1.14.9 ± 1.62.7 ± 1.03.1 ± 1.2
 MID0.5 ± 1.00.2 ± 0.43.6 ± 1.42.6 ± 1.22.9 ± 2.0
  • ap < 0.05 with NULL.

  • bp < 0.05 with HET.