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Local dynamic stability in temporal pattern of intersegmental coordination during various stride time and stride
Benio Kibushi1,2, Toshio Moritani3, Motoki Kouzaki4
1Laboratory of Neurophysiology, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonamatsu, Sakyo-ku, Kyoto, Kyoto, 606-8501, Japan.
Experimental Brain Research
|November 4, 2018
Summary
Fast walking and very short strides reduce the stability of whole-body coordination. This study explored how stride time-length combinations affect kinematic synergy stability during walking.
Area of Science:
- Biomechanics
- Neuroscience
- Human Movement Science
Background:
- The central nervous system regulates walking speed by coordinating stride time-length combinations and whole-body movements.
- While energy cost explains stride selection, kinematic coordination stability may also be a key factor.
- Understanding the interplay between stride parameters and coordination stability is crucial for human locomotion research.
Purpose of the Study:
- To investigate the stability of whole-body kinematic coordination across various stride time-length combinations during walking.
- To determine if kinematic coordination stability influences the selection of stride time-length combinations.
- To evaluate the relationship between walking speed, stride length, and local dynamic stability.
Main Methods:
- Quantified whole-body kinematic coordination using kinematic synergies (intersegmental and temporal coordination).
- Assessed local dynamic stability by calculating maximum Lyapunov exponents of temporal coordination.
- Analyzed these measures across a range of stride time-length combinations during walking.
Main Results:
- The stability of temporal coordination, measured by maximum Lyapunov exponents, varied significantly with stride time-length combinations.
- Higher maximum Lyapunov exponents were observed at faster walking speeds and with very short stride lengths.
- Fast walking and very short strides were associated with reduced local dynamic stability in temporal coordination.
Conclusions:
- Fast walking speeds and very short stride lengths are linked to decreased local dynamic stability of kinematic synergy temporal coordination.
- Kinematic coordination stability may play a significant role in regulating walking speed and stride parameters.
- These findings offer insights into the neural control strategies underlying human locomotion and stability.
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