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Effectiveness of visual feedback during isokinetic exercise

H J Kim¹, J F Kramer

¹Scott Physiotherapy Clinic, Surey, British Columbia, Canada.

The Journal of Orthopaedic and Sports Physical Therapy

|December 24, 1997

Summary

Visual feedback enhances isokinetic test performance and reliability in knee extensors. However, its effectiveness may decrease as the skill becomes well-learned over time.

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Area of Science:

Biomechanics
Motor Control
Exercise Physiology

Background:

Visual feedback is known to improve performance in isokinetic testing.
The duration of visual feedback's advantage is not well-established.

Purpose of the Study:

To compare knee extensor torques between visual feedback and no visual feedback groups.
To assess performance over a 2-week period and 4 weeks post-testing.

Main Methods:

Healthy, sedentary participants (N=40) were randomized into visual feedback or no visual feedback groups.
Visual feedback involved viewing real-time knee extension force against a target.
Isokinetic knee extensor torques were measured on three occasions over 2 weeks and at 4 weeks after the final test.

Main Results:

The visual feedback group consistently produced greater and more reliable knee extensor torques (p < 0.05).
The effectiveness of visual feedback appeared to diminish across the testing occasions.
This suggests a potential decrease in benefit as the motor skill is acquired.

Conclusions:

Visual feedback significantly enhances isokinetic knee extensor torque production and reliability.
The benefit of visual feedback may lessen with skill acquisition, indicating it might be less crucial for well-learned tasks.
Further research should explore visual feedback's role in motor learning, skill retention, and transfer in complex activities.

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