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From:
Accid Anal Prev. Author manuscript; available in PMC 2012 October 15.
Published in final edited form as:
Accid Anal Prev. 2011 July; 43(4): 1480–1487.
Published online 2011 March 24. doi: 10.1016/j.aap.2011.02.028

Table 2

Mean (SD) of the minimum margin of safety (MMOS) and displacement rate outcomes for centre-of-mass (COM) and centre-of-pressure (COP) across floor conditions for the backwards floor translation task.

ParameterFloor condition
RigidSmartCellSofTileFirm-FoamSoft-Foam
Margin of safety (m)
MMOSCOM0.058 (0.013)0.062 (0.010)0.051 (0.013)0.027 (0.013)0.044 (0.010)
MMOSCOP0.026 (0.008)0.030 (0.007)0.021 (0.012)0.017 (0.014)0.019 (0.011)
Relative rates (m/s)
COM0–20%0.185 (0.014)0.182 (0.014)0.195 (0.014)0.193 (0.041)0.189 (0.022)
COM20–40%0.267 (0.047)0.279 (0.037)0.270 (0.040)0.199 (0.070)0.242 (0.049)
COM40–60%0.116 (0.036)0.132 (0.060)0.113 (0.043)0.076 (0.030)0.077 (0.021)
COM60–80%0.096 (0.015)0.091 (0.018)0.096 (0.020)0.067 (0.025)0.078 (0.019)
COM80–100%0.048 (0.010)0.046 (0.012)0.044 (0.008)0.034 (0.006)0.041 (0.019)
COP0–20%0.217 (0.030)0.237 (0.026)0.291 (0.038)0.238 (0.053)0.273 (0.021)
COP20–40%0.541 (0.073)0.542 (0.074)0.560 (0.089)0.457 (0.099)0.538 (0.086)
COP40–60%0.566 (0.091)0.546 (0.090)0.495 (0.072)0.288 (0.061)0.309 (0.109)
COP60–80%0.471 (0.097)0.464 (0.100)0.401 (0.087)0.306 (0.054)0.319 (0.177)
COP80–100%0.134 (0.066)0.154 (0.067)0.145 (0.066)0.102(0.056)0.182 (0.115)
Absolute rates (m/s)
COM0–2 cm0.220 (0.007)0.220 (0.006)0.226 (0.009)0.222 (0.019)0.223 (0.008)
COM2–4 cm0.104 (0.012)0.100 (0.015)0.112 (0.014)0.090 (0.012)0.084 (0.015)
COP0–2 cm0.213 (0.032)0.227 (0.026)0.268 (0.034)0.241 (0.028)0.266 (0.029)
COP2–4 cm0.525 (0.061)0.538 (0.074)0.571 (0.088)0.460 (0.071)0.608 (0.154)
COP4–6 cm0.567 (0.092)0.553 (0.085)0.499 (0.056)0.304 (0.064)0.330 (0.119)
COP6–8 cm0.481 (0.136)0.490 (0.102)0.462 (0.093)0.301 (0.039)0.251 (0.087)