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Altered behaviour in hamsters conceived and born in hypergravity

H N Sondag¹, H A de Jong, W J Oosterveld

¹Vestibular Department ENT, University of Amsterdam, The Netherlands.

Brain Research Bulletin

|January 1, 1997

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Hypergravity exposure during development impairs hamster vestibular function, causing lasting deficits in swimming and air-righting reflexes. These behavioral changes persist even after returning to normal gravity.

Area of Science:

Vestibular Neuroscience
Developmental Biology
Gravitational Biology

Background:

Vestibular system development is sensitive to gravitational forces.
Understanding hypergravity's impact is crucial for space exploration and human health.

Purpose of the Study:

To investigate the effects of hypergravity on vestibular function and behavior in developing hamsters.
To determine if developmental exposure to hypergravity causes persistent behavioral alterations.

Main Methods:

Hamsters were conceived and born in either 2.5 G (hypergravity) or 1 G (normal gravity).
Four experimental groups were established: high load (HL), high short (HS), control (CON), and rotation (ROT).
Locomotor activity, swimming ability, and air-righting reflexes were assessed at 4 weeks old and periodically thereafter.

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Main Results:

Hamsters exposed to hypergravity (HL and HS groups) exhibited disturbed swimming ability, including circling and reduced speed.
HL hamsters showed decreased activity and fewer correct air-rightings under 2.5 G.
Behavioral deficits in swimming and air-righting persisted for over 3 months in normal gravity.

Conclusions:

Embryonal development in a hypergravity environment causes persistent behavioral disturbances in hamsters.
Hypergravity and rotation have distinct effects on behavioral development.
Vestibular system adaptations to hypergravity during development have long-lasting consequences.