Table 2.

Conditions of the factorial experimental design.

	Environmental Constraints on Walking		Cognitive Task Demands
Single Tasking	Low	High	Low	High
	(1) Flat walking	(2) Obstructed walking	(3) Backward counting	(4) Random number generation
	Environmental Constraint		Cognitive Demands
Dual Tasking	Low–Low	Low–High	High–Low	High–High
	(5) Flat walking with BC	(6) Flat walking with RNG	(7) Obstructed walking with BC	(8) Obstructed walking with RNG

Note: BC = backward counting; RNG = random number generation.