Does dual task placement and duration affect split-belt treadmill adaptation?

Area of Science:

• Neuroscience
• Biomechanics
• Motor Control

Background:

• Dual tasking during prolonged split-belt adaptation can impede motor learning and prolong aftereffects.
• Split-belt adaptation is explored for gait symmetry rehabilitation, but optimal dual tasking strategies remain unclear.

Purpose of the Study:

• To investigate how the timing and duration of dual tasks affect split-belt adaptation and aftereffects.
• To determine if dual task placement (early vs. late in adaptation) or duration influences gait symmetry recovery.

Main Methods:

• Healthy adults underwent split-belt treadmill adaptation with concurrent cognitive tasks (n-back).
• Dual task timing was varied (early vs. late adaptation), as was task duration (continuous vs. intermittent).
• Gait symmetry, adaptation rates, and cognitive performance were measured.

Main Results:

• When cognitive tasks began simultaneously with split-belt adaptation, participants prioritized gait, reducing cognitive performance.
• Gait symmetry adaptation and de-adaptation were unaffected by the timing or duration of the dual task.
• Participants prioritized motor adaptation over cognitive task accuracy.

Conclusions:

• The initial phase of split-belt adaptation may act as a period of cognitive interference.
• Dual tasking strategies, particularly during the early adaptation phase, show promise for gait rehabilitation.
• Future research should explore complex motor-cognitive dual task paradigms for rehabilitation.