[Purpose] To examine the influence of dorsolateral prefrontal cortex (DLPFC) activation,
ankle muscle activities, and coactivation on postural steadiness during dual-tasks.
[Participants and Methods] A total of 14 participants (8 males, 6 females) were included.
The participants stood straight on the force plate, and performed 3 different tasks: 1) a
quiet standing (single-task), 2) a repetition of a number (dual-task 1: DT1), and 3) a
serial subtraction (dual-task 2: DT2). We divided the participants into 2 groups (S and L
group) according to whether their center of pressure paths in the dual-tasks were shorter
or longer than those in the single-task. The EMG activity of the gastrocnemius lateralis
and tibialis anterior were measured; the oxygenated hemoglobin (oxy-Hb) level in the DLPFC
were measured using fNIRS. [Results] The results revealed that oxy-Hb in the left DLPFC
increased significantly in all participants during DT2 compared to a single-task. Further,
we found that the S group exhibited a higher rate of tibialis anterior activity and ankle
muscle coactivation than the L group during DT2. [Conclusion] We concluded that the
increase of the DLPFC activation varied with the dual-tasks; moreover, younger individuals
modulate their standing posture using different strategies for posture steadiness during
posture-calculating task.
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