Gait transitions are not dependent on changes in intralimb coordination variability.

Area of Science:

• Motor control and coordination.
• Biomechanics of human locomotion.

Background:

• The HKB model, applied to upper extremity movements, predicts changes in relative phase variability during transitions.
• Previous research focused on upper limb stationary tasks.

Purpose of the Study:

• To test the HKB model's predictions for lower extremity intralimb coordination during gait transitions.
• To investigate walk-to-run and run-to-walk transitions on a treadmill.

Main Methods:

• 10 participants performed continuous treadmill walk-to-run and run-to-walk trials.
• Measured standard deviation of knee-ankle and hip-ankle relative phase.
• Analyzed variability before and after gait transitions.

Main Results:

• No increase in relative phase variability was observed before walk-to-run or run-to-walk transitions.
• No decrease in knee-ankle relative phase variability was found after transitions.
• Results did not support HKB model's variability predictions for lower limb gait transitions.

Conclusions:

• The HKB model's predictions regarding relative phase variability may not apply to lower extremity intralimb coordination during gait transitions.
• Further research is needed to understand coordination dynamics in human locomotion.
• This study highlights limitations in applying existing coordination models to new movement contexts.