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Evaluating eye-body coordination during unrestrained functional activity in older persons
R P Di Fabio1, S Paul, A Emasithi
1Department of Physical Medicine and Rehabilitation, University of Minnesota, MN 55455, USA. difab001@tc.umn.edu
Summary
Older adults coordinate eye, head, and trunk movements to control gaze during daily activities. This coordination is crucial for preventing falls and related injuries in the elderly population.
Area of Science:
- Gerontology
- Biomechanics
- Ophthalmology
Background:
- Traditional studies of ocular-motor control limit subject motion, failing to capture real-world gaze strategies in older adults.
- Sensorimotor strategies for gaze control during activities of daily living (ADLs) in older individuals remain underquantified.
Purpose of the Study:
- To describe eye-head-trunk coordination during a functional task in freely moving, community-dwelling older persons.
- To investigate gaze control strategies in older adults during a dynamic, functional activity.
Main Methods:
- Thirty-five community-dwelling older adults (71-92 years) participated.
- Surface electro-oculography and electromagnetic tracking measured vertical eye movements and head position.
- Subjects performed a stand-from-chair task to assess coordination.
Main Results:
- Head motion during standing from a chair was low-frequency (median z = 0.25 Hz, median pitch = 0.32 Hz).
- Eye motion generally followed vertical body motion, with the head and trunk leading.
- Vertical gaze was synchronized with and moved in the same direction as head pitch.
Conclusions:
- Gaze control is an active, integrated component of the standing motion in older adults.
- Oculomotor and head motor systems coordinate to direct gaze, potentially suppressing the vestibuloocular reflex.
- Understanding eye-head-trunk interactions is vital for addressing fall risk and injuries in older populations.