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Cognitive-motor interference during walking with modified leg mechanics: a dual-task walking study.

Norman Riedel1, Michael Herzog2, Thorsten Stein2

  • 1Institute of Human and Industrial Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany.

Frontiers in Psychology
|May 3, 2024
PubMed
Summary

Modified leg mechanics in walking increase cognitive-motor interference, especially during difficult dual-task situations. This highlights the need to understand human-exoskeleton interaction for designing effective assistive devices.

Keywords:
attentional processescognitive-motor interferencedual-task walkingexoskeletonlower extremity loadingmodified leg mechanicsmotor control

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Area of Science:

  • Biomechanics
  • Human-Computer Interaction
  • Neuroscience

Background:

  • Mobile exoskeletons can alter musculoskeletal biomechanics due to weight and restricted motion.
  • This alteration may impose physical and cognitive loads on users.
  • Understanding lower extremity loading's effect on cognitive-motor interference is vital for wearable device design and training.

Purpose of the Study:

  • To investigate how modified leg mechanics affect cognitive-motor interference during dual-task walking.
  • To analyze gait variability in relation to cognitive task difficulty.
  • To determine if lower extremity loading modifies the relationship between gait and cognitive load.

Main Methods:

  • Fifteen healthy adults walked on a treadmill with and without thigh/shank weight cuffs.
  • Participants performed simple (Stroop) and difficult (serial subtraction) cognitive tasks.
  • Gait parameters (step length, width, stride time, double support time) and secondary task performance were measured.

Main Results:

  • Modified leg mechanics increased overall gait variability.
  • Double support time variability decreased during dual-task walking, but not with modified mechanics during the difficult task.
  • Modified leg mechanics altered gait patterns (increased step length, width, stride time; decreased double support time), independent of cognitive load.

Conclusions:

  • Modified leg mechanics may exacerbate cognitive-motor interference in demanding dual-task scenarios.
  • The interplay of attention and attentional resource competition influences gait variability.
  • Further research into cognitive-motor interference mechanisms is crucial for human-exoskeleton interaction.