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Estrogen-mediated individual differences in female rat voluntary running behavior
Victoria Mathis1, Lauren Wegman-Points1, Brock Pope1
1Department of Physiology and Pharmacology, College of Osteopathic Medicine, Des Moines University, Des Moines, Iowa, United States.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 2024
Summary
Estrogen significantly influences voluntary wheel running (VWR) in female rats, regulating activity levels and individual differences. Estrogen replacement therapy restores running behavior after ovariectomy, highlighting its crucial role in exercise motivation.
Area of Science:
- Neuroscience
- Endocrinology
- Behavioral Science
Background:
- Voluntary wheel running (VWR) in rodents models exercise behavior.
- Female rats exhibit higher running activity than males.
- Estrogen's role in regulating female exercise behavior is not fully understood.
Purpose of the Study:
- To investigate the regulatory role of estrogen signaling in voluntary wheel running (VWR) in female rats.
- To determine if estrogen levels influence running duration, speed, and total distance.
- To establish an animal model for studying estrogen-driven exercise behavior.
Main Methods:
- Measuring VWR behavior (duration, speed, distance) in female rats.
- Implementing ovariectomy (OVX) to remove endogenous estrogen.
- Administering estrogen replacement therapy (estradiol benzoate via injections and osmotic minipumps) to OVX rats.
Main Results:
- Running behavior showed cyclic variations linked to the natural estrous cycle.
- Ovariectomy significantly reduced running activity and abolished the cyclic pattern.
- Estrogen replacement restored running levels and the cyclic pattern, preserving individual running differences.
- Variations in running distance were attributed to differences in both speed and duration.
Conclusions:
- Estrogen signaling is a critical regulator of VWR in female rats.
- The estrous cycle modulates exercise behavior through estrogen.
- This estrogen-replacement VWR model is valuable for studying the neurobiological basis of voluntary physical activity in females.
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