Table 2.

Mean ± SE (95% CI) and coefficient of variation (CV) for spatiotemporal variables in older adults (OA), younger adults (YA), for pre-, during-, and post- transition phases for normal-slow (NS) and normal-fast (NF) conditions.

			Normal Slow			Normal Fast
Variable	Group		Pre	During	Post	Pre	During	Post
CoM Velocity (m/s)	OA	Mean ± SE (95% CI)	1.21 ± 0.04 ([1.13 1.29])^†	1.05 ± 0.04 ([0.97 1.13])^{^†}	0.8 ± 0.04 ([0.73 0.88])^{^}	1.23 ± 0.04 ([1.15 1.32])^†	1.26 ± 0.05 ([1.17 1.36])^†	1.65 ± 0.06 ([1.53 1.77])^{^}
		CV ± SE (95% CI)	0.06 ± 0.01 ([0.05 0.06])^†	0.11 ± 0.01 ([0.09 0.12])^{^†}	0.12 ± 0.01 ([0.1 0.15])^{^}	0.04 ± 0.01 ([0.03 0.05])	0.06 ± 0.01 ([0.04 0.07])^†	0.08 ± 0.01 ([0.07 0.09])^{^}
	YA	Mean ± SE (95% CI)	1.24 ± 0.05 ([1.13 1.34])^†	1.05 ± 0.05 ([0.96 1.15])^{^†}	0.84 ± 0.05 ([0.74 0.94])^{^}	1.21 ± 0.05 ([1.11 1.32])^†	1.33 ± 0.06 ([1.22 1.45])^{^†}	1.81 ± 0.07 ([1.66 1.95])^{^}
		CV ± SE (95% CI)	0.05 ± 0.01 ([0.04 0.06])^†	0.11 ± 0.01 ([0.09 0.13])^{^†}	0.1 ± 0.02 ([0.07 0.13])^{^}	0.04 ± 0.01 ([0.02 0.05])^†	0.08 ± 0.01 ([0.06 0.09])^{^†}	0.07 ± 0.01 ([0.06 0.09])^{^}
Step Length (m)	OA	Mean ± SE (95% CI)	0.67 ± 0.01 ([0.64 0.7])^†	0.52 ± 0.01 ([0.49 0.54])^{^†}	0.56 ± 0.02 ([0.53 0.6])^{^}	0.67 ± 0.01 ([0.64 0.7])^†	0.52 ± 0.01 ([0.49 0.54])^{^†}	0.72 ± 0.02 ([0.69 0.76])^{^}
		CV ± SE (95% CI)	0.04 ± 0.01 ([0.01 0.06])^†	0.05 ± 0.03 ([0.01 0.11])^†	0.1 ± 0.02 ([0.05 0.14])^{^}	0.03 ± 0.01 ([0.02 0.04])^†	0.05 ± 0.01 ([0.04 0.06])^*^{^†}	0.08 ± 0.01 ([0.06 0.09])^{^}
	YA	Mean ± SE (95% CI)	0.66 ± 0.02 ([0.62 0.7])^†	0.5 ± 0.02 ([0.47 0.53])^{^†}	0.54 ± 0.02 ([0.49 0.58])^{^}	0.66 ± 0.02 ([0.63 0.7])^†	0.5 ± 0.02 ([0.47 0.54])^{^†}	0.77 ± 0.02 ([0.73 0.81])^{^}
		CV ± SE (95% CI)	0.06 ± 0.01 ([0.03 0.09])^†	0.13 ± 0.04 ([0.05 0.21])^{^†}	0.13 ± 0.03 ([0.07 0.19])^{^}	0.03 ± 0.01 ([0.02 0.04])^†	0.08 ± 0.01 ([0.06 0.09])^*^{^†}	0.07 ± 0.01 ([0.05 0.08])^{^}
Step Width (m)	OA	Mean ± SE (95% CI)	0.08 ± 0.01 ([0.07 0.1])^†	0.1 ± 0.01 ([0.09 0.11])^{^}	0.1 ± 0.01 ([0.09 0.11])^{^}	0.08 ± 0.01 ([0.07 0.1])	0.1 ± 0.01 ([0.09 0.11])^{^†}	0.08 ± 0.01 ([0.07 0.1])
		CV ± SE (95% CI)	0.37 ± 0.03 ([0.31 0.43])^†	0.21 ± 0.03 ([0.16 0.26])^{^}	0.25 ± 0.04 ([0.18 0.32])^{^}	0.39 ± 0.05 ([0.3 0.49])^*	0.25 ± 0.02 ([0.21 0.29])^*^{^†}	0.46 ± 0.03 ([0.39 0.52])^*^{^}
	YA	Mean ± SE (95% CI)	0.1 ± 0.01 ([0.08 0.11])	0.1 ± 0.01 ([0.09 0.11])	0.1 ± 0.01 ([0.09 0.12])	0.1 ± 0.01 ([0.08 0.12])	0.11 ± 0.01 (0.1 [0.13])^†	0.1 ± 0.01 ([0.08 0.11])
		CV ± SE (95% CI)	0.29 ± 0.04 ([0.22 0.36])	0.19 ± 0.03 ([0.12 0.25])^†	0.3 ± 0.04 ([0.21 0.39])	0.23 ± 0.06 ([0.11 0.35])^*	0.13 ± 0.02 ([0.08 0.17])^*^†	0.3 ± 0.04 ([0.22 0.38])^*

Indicates significant between-subjects difference (p < 0.05).

^{^}

Indicates significantly different from within-subjects pre-transition values (p < 0.05).

^†

Indicates significantly different from within-subjects post-transition values (p < 0.05).