Related Experiment Video
Updated: Sep 3, 2025
08:24
Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
Published on: August 30, 2016
10.3K
Task Specific and General Patterns of Joint Motion Variability in Upright- and Hand-Standing Postures
Moira Pryhoda1, Karl M Newell2, Cassie Wilson3
1Department of Mechanical and Materials Engineering, University of Denver, Denver, CO 80208, USA.
Entropy (Basel, Switzerland)
|July 27, 2022
Summary
Maintaining balance in upright and hand stands involves controlling the center of mass (CM). Joint movement variability, particularly in the neck, plays a key role in this complex balance control strategy.
Area of Science:
- Biomechanics
- Human Motor Control
- Sports Science
Background:
- Static balance relies on projecting the center of mass (CM) within the base of support.
- Controlling balance during upright and hand stances involves complex joint coordination.
Purpose of the Study:
- To investigate if joint angle and position variability predict CM stability in upright and hand stances.
- To analyze balance control from a degrees of freedom (DF) perspective.
Main Methods:
- Collected full-body 3D kinematic data from 10 junior female gymnasts.
- Recorded data during 30-second floor upright and hand stands.
- Analyzed joint angle dispersion and time-dependent regularity (SampEn) of joint movements and CM/center of pressure (CP) sway.
Main Results:
- Joint angle and sway motion dispersion were greater than CM and CP dispersion.
- Higher joint dispersion correlated inversely with time-dependent irregularity (SampEn).
- Neck motion variability was significantly greater in the anterior-posterior direction during upright stance, suggesting a role for vision.
Conclusions:
- CM control strategies for balance are both task-specific and general.
- Skeletal-muscular organization and inherent variability in joint movements contribute to balance control.
- The findings highlight the complex interplay of joint dynamics in maintaining static balance.
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