Related Experiment Videos
Intentionality in human gait control: modifying the frequency-to-amplitude relationship
1Université d'Aix-Marseille II, France.
Summary
Human gait flexibility allows intentional adaptation of stride frequency and amplitude. Two main strategies involve adjusting leg muscle properties for preferred states and brief actions for temporary changes.
Area of Science:
- Biomechanics
- Human Locomotion
- Motor Control
Background:
- Human steady gait exhibits consistent frequency-to-amplitude relationships.
- This relationship is adaptable, forming the basis for intentional locomotion adjustments.
Purpose of the Study:
- Investigate the underlying processes of gait flexibility.
- Identify strategies for intentional adaptation of stride organization.
Main Methods:
- Experiment 1: Participants intentionally modified the stride frequency-to-amplitude relationship to reach preferred or nonpreferred steady states.
- Experiment 2: Participants temporarily perturbed the stride frequency-to-amplitude relationship to alter single stride length.
Main Results:
- Two primary on-line adaptation strategies were identified.
- Strategy 1: Adjustment of tonic leg properties to achieve nonpreferred steady states.
- Strategy 2: Phasic actions to temporarily deviate from a steady state.
Conclusions:
- Intentional gait adaptation relies on distinct motor control strategies.
- Tonic adjustments and phasic actions enable flexible locomotion within biomechanical constraints.