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Force and Position Control in Humans - The Role of Augmented Feedback

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Visual Information Processing in Older Adults: Force Control and Motor Unit Pool Modulation.

MinHyuk Kwon^1,2, Evangelos A Christou²

¹Department of Kinesiology and Health Promotion, California State Polytechnic University, Pomona, CA, USA.

Journal of Motor Behavior

|December 28, 2023

Summary

This summary is machine-generated.

Older adults show increased force variability with more visual information, linked to motor neuron pool activation changes. This highlights how visual feedback impacts motor control in aging populations.

Keywords:

aging force control motor units visual feedback

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Area of Science:

Motor control
Neuroscience
Human aging research

Background:

Increased visual information can negatively affect force control, particularly in older adults.
The specific impact of visual feedback on motor unit pool activation in aging remains under-investigated.

Purpose of the Study:

To investigate how heightened visual feedback influences motor neuron pool activation and force control in older adults compared to young adults.
To identify the neural mechanisms underlying age-related differences in motor control under varying visual conditions.

Main Methods:

Fifteen older adults and fifteen young adults performed a submaximal ankle dorsiflexion force task.
Visual feedback gain was manipulated between low (0.05°) and high (1.2°) conditions.
Motor unit pool activation and force variability were assessed.

Main Results:

Older adults demonstrated significantly greater force variability, especially under high-gain visual feedback.
This increased variability was associated with modulations in multiple motor units within the 10-35 Hz frequency range.
No significant changes were observed in single motor unit activity.

Conclusions:

High-gain visual feedback amplifies force variability in older adults.
This amplification is linked to increased activation within the motor neuron pool, specifically in the 10-35 Hz range.
Findings suggest a neural basis for age-related decline in motor control with increased visual demands.