[Measurement and statistical analysis of the vertical force in normal young people's gait].
OBJECTIVE: To find a method for evaluating the relationship between mechanical data and gait efficiently. METHOD: Gait mechanical data of 27 young men (20-22 years) without history of the kinetic diseases were collected using a force-measuring system. The data were transformed into characteristic two-peak curves in vertical direction (z-axis). Seven characteristic parameters were distilled. The coefficient of variation (CV) and the absolute symmetry index (ASI) of the parameters between left foot and right foot were analyzed. RESULT: It was found that CV of the first temporal parameter of gait (T(Z1)) is equal to 14.49%, which corresponds to larger dispersion. The values of ASI are all lower than 12.5%, which means the symmetry between left and right feet meets general requirement. But the P value (result of t-test) of F(Z2) is 0.0368 (lower than 0.05), which means that there is obvious differentia between F(Z2) of left and right feet, while no such differentiae were found for the other six characteristic parameters. t-test was also used to analyze the differentia between the gait of male and female. It is still found that p value of F(Z2) is lower than 0.01, which corresponds to a great differentia on F(Z2) between male and female. CONCLUSION: Some significant conclusions of the repetition, dispersion, symmetry and differentia of gait data have been obtained by the analysis.