Fig. 5.

Selected mechanical variables (means ± SD) during a stride of unconstrained and narrow-path walking. Thick continuous lines, mean for unconstrained walking; thick dashed lines, narrow walking; thin continuous lines, SD for the mean of the unconstrained condition. Mean data of 5 cats (Table 1). Thin horizontal lines above panels indicate phases in which there is a statistically significant difference (P < 0.05) between narrow and unconstrained walking. A: displacement of the CoM in the left and right directions; left direction corresponds to the left side of the body. B: vertical displacement of the CoM. C: vertical displacement of the head-neck segment. D: head-neck segment orientation; clockwise segment rotation from the horizontal is defined as negative.