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Motor and reflexive behavior in the aging rat

J E Wallace, E E Krauter, B A Campbell

Journal of Gerontology

|May 1, 1980

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Aging affects complex motor skills more than simple reflexes in rats. Early-developed motor skills are retained longer, suggesting a "first-in, last-out" aging pattern for these behaviors.

Area of Science:

Neuroscience
Gerontology
Animal Behavior

Background:

Motor and reflexive behaviors are crucial for survival and interaction.
Understanding age-related changes in motor function is vital for gerontology and neuroscience.
Fischer 344 rats are a common model for studying aging.

Purpose of the Study:

To investigate the impact of aging on a wide range of motor and reflexive tasks in Fischer 344 rats.
To determine if age-related declines differ between simple reflexive and complex locomotor behaviors.
To explore the relationship between the developmental emergence of behaviors and their susceptibility to aging.

Main Methods:

Four age groups of Fischer 344 rats (6, 12, 18, 24 months) were tested.
A battery of tasks assessed simple reflexes (placing, righting) and complex motor control (wire suspension, pole descent, platform traversal, rotorod).

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Performance metrics were analyzed for age-related changes.

Main Results:

Simple reflexive tasks showed minimal age-related decline.
Complex locomotor tasks requiring coordinated motor control exhibited significant performance decrements with age.
Declines in complex motor skills were observed even in younger adult rats.
Early-emerging behaviors demonstrated greater resilience to aging compared to later-developing skills.

Conclusions:

Aging disproportionately impacts complex motor behaviors over simple reflexes.
The findings support a "first-in, last-out" principle for the aging of motor and reflexive behaviors.
This suggests that behaviors established earlier in life are more resistant to age-related decline.