Postural control in healthy young adults using a double seesaw device

Area of Science:

• Biomechanics
• Human Motor Control
• Sensorimotor Integration

Background:

• Postural control is crucial for maintaining stability.
• Previous research has explored balance on single unstable surfaces.
• The effects of asymmetrical support on postural control require further investigation.

Purpose of the Study:

• To investigate postural control in young adults using a novel double seesaw device.
• To examine the effects of associated versus dissociated seesaws on balance.
• To analyze the impact of asymmetrical support conditions on center-of-pressure (CP) and center-of-gravity (CG) movements.

Main Methods:

• Participants stood on two side-by-side seesaws placed on force platforms.
• Seesaws could be coupled, dissociated, or feature different radii/stable surfaces.
• Measurements included center-of-pressure (CP) and vertically projected center-of-gravity (CGv) displacements.

Main Results:

• Dissociating seesaws increased mediolateral CP and CGv movements, while decreasing anteroposterior movements.
• Asymmetrical support (different radii or stable surface) led to larger anteroposterior CP displacements under the more stable foot.
• CP output resulted from compensatory mechanisms between the feet to maintain overall balance.

Conclusions:

• The double seesaw device effectively challenges postural control by inducing asymmetrical leg movements.
• This setup allows for the study of complex sensorimotor coordination during balance tasks.
• The findings highlight compensatory strategies employed to maintain stability under challenging conditions.