Head and Tibial Acceleration as a Function of Stride Frequency and Visual Feedback during Running
Michael A Busa1,2, Jongil Lim1,2, Richard E A van Emmerik2
1Biomechanics Laboratory, Department of Kinesiology, University of Massachusetts Amherst, Amherst, Massachusetts, United States of America.
Plos One
|June 9, 2016
Summary
Runners can improve head-gaze stability by using visual feedback, which reduces head accelerations and shock transmission during running at various stride frequencies.
Area of Science:
- Biomechanics
- Human Movement Science
- Neuroscience
Background:
- Running involves complex shock transmission to the head.
- Head-gaze stability is crucial for runners but its regulation across stride frequencies is not fully understood.
Purpose of the Study:
- To investigate the impact of visual feedback on head-gaze orientation during running.
- To analyze effects on tibial and head accelerations, shock attenuation, and head-gaze motion across different stride frequencies.
Main Methods:
- Twelve recreational runners ran on a treadmill at preferred speed and varied stride frequencies (±10%, ±20%).
- Data collected with and without real-time visual feedback of head-gaze orientation.
- Measured tibial/head accelerations, shock attenuation, and head-gaze motion magnitude and velocity.
Main Results:
- Lower stride frequencies increased tibial and head accelerations.
- Visual feedback significantly reduced head acceleration magnitude and integrated power spectral density.
- Visual feedback also decreased overall head-gaze motion magnitude and velocity.
Conclusions:
- Runners maintain head acceleration stability across stride frequencies, with increases only at 20% below preferred.
- Impact accelerations are primarily influenced by stride frequency, not visual feedback.
- Enhanced visual task demands via head-gaze feedback improve head-gaze stability and reduce head accelerations.
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