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Animal models and their importance to human physiological responses in microgravity
1Department of Physiology, University of Arizona, Tucson 85721-0093, USA.
Medicine and Science in Sports and Exercise
|October 1, 1996
Summary
The tail-suspended animal model effectively simulates microgravity's physiological effects, mirroring human responses in blood volume, cardiac function, and metabolism. This model shows promise for studying spaceflight's impact on human physiology.
Area of Science:
- Space physiology
- Gravitational biology
Background:
- Microgravity's physiological effects are theorized to stem from fluid shifts and lack of tissue deformation.
- Human studies use bed rest and head-down tilt (HDT), while animal models employ tail suspension.
Purpose of the Study:
- To evaluate the tail-suspended animal model's efficacy in simulating microgravity-induced physiological changes.
- To assess its utility in investigating underlying mechanisms for spaceflight adaptations.
Main Methods:
- Utilized a tail-suspended, head-down, hindlimb non-weightbearing model in animals.
- Compared animal model results to human data from HDT experiments.
Main Results:
- The model successfully replicated human musculoskeletal and cardiopulmonary changes, including blood volume, erythropoiesis, cardiac mass, and metabolic alterations.
- Demonstrated potential for studying oxygen partial pressure changes (PO2) in capillaries and arteries.
Conclusions:
- The tail-suspended animal model is valuable for studying in-flight and post-flight human physiological responses and mechanisms.
- Further research is needed to determine its applicability to adrenoreceptor regulation and pulmonary function studies.
