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Interaction of support surface stability and Achilles tendon vibration during a postural adaptation task
Marius Dettmer1, Amir Pourmoghaddam, Daniel P O'Connor
1Department of Health and Human Performance, University of Houston, 104C GAR, 3855 Holman St., Houston, TX 77204, USA. madettmer@uh.edu
Human Movement Science
|March 8, 2013
Summary
Human postural control adapts to challenges like Achilles tendon vibration and support surface changes. With practice, individuals improve sway reduction, demonstrating adaptable motor control strategies.
Area of Science:
- Human motor control
- Neuroscience
- Biomechanics
Background:
- Human postural control involves complex sensory-motor integration and adaptation.
- The system must adapt to both short-term and long-term challenges.
- Support surface stability and sensory input, like vibration, can influence postural control.
Purpose of the Study:
- To investigate the interaction between support surface stability and Achilles tendon vibration.
- To examine how the human postural control system adapts to these combined challenges over time.
- To utilize both linear and non-linear measures to assess postural performance and adaptation.
Main Methods:
- Participants performed postural tasks under varying support surface conditions with and without Achilles tendon vibration.
- Linear measure: Equilibrium Score (ES) based on anterior-posterior sway amplitude.
- Non-linear measure: Approximate Entropy analysis of center-of-pressure (COP) data.
Main Results:
- Achilles tendon vibration had early effects on postural stability, influenced by support surface characteristics.
- Participants demonstrated adaptation by reducing sway with extended practice over several days.
- Adaptation in sway reduction was independent of support surface stability.
- Approximate entropy analysis provided insights into the underlying control adaptation processes.
Conclusions:
- The human postural control system can adapt to challenges posed by Achilles tendon vibration and altered support surfaces.
- Adaptation, shown by reduced sway, occurs with practice and is robust to changes in support surface stability.
- Combined linear and non-linear analyses offer a comprehensive understanding of postural control adaptation mechanisms.
