Estrogen-Mediated Exercise Behavior in Female Rats
Description
Engaging in regular exercise positively impacts both physical and mental health. In recent years, there has been a rise in chronic disease associated with physical inactivity, and humans display significant variability in exercise habits. In rats, voluntary wheel running can be studied to understand the factors that may contribute to their exercise behavior. Female rats have been found to run more than their male counterparts, and they have a cyclic running pattern correlated with their estrus cycle. Here we explore the role of estrogen in female rats’ voluntary running activity, both in the laboratory and also with a comprehensive literature review of the utility and relevance of estrogen receptor antagonism and exercise behavior. We studied the running patterns of female rats, including the duration, speed, and total running distance, under normal physiological conditions. Daily injections of ICI-182780, a potent estrogen receptor antagonist, were then administered for a week, followed by a period of rebound observation as the antagonist left the system. We found that upon administration of ICI-182780, the cyclic running pattern terminated, and estrogen-mediated running behaviors decreased as the estrogen receptors were blocked. During the rebound observation period, running behaviors slowly returned, and the cyclic pattern began to reestablish as the estrogen receptors recovered from inhibition. This study and literature review allows us to better understand sex-specific mechanisms that contribute to physical activity through an in-depth investigation of estrogen/estrogen receptor interactions.
Citation Information
Coffey, Alexis and Yuan, LiLian, "Estrogen-Mediated Exercise Behavior in Female Rats" (2026). Office of Research DMU Research Symposium. 61.
https://digitalcommons.dmu.edu/researchsymposium/2025rs/2025abstracts/61
Estrogen-Mediated Exercise Behavior in Female Rats
Engaging in regular exercise positively impacts both physical and mental health. In recent years, there has been a rise in chronic disease associated with physical inactivity, and humans display significant variability in exercise habits. In rats, voluntary wheel running can be studied to understand the factors that may contribute to their exercise behavior. Female rats have been found to run more than their male counterparts, and they have a cyclic running pattern correlated with their estrus cycle. Here we explore the role of estrogen in female rats’ voluntary running activity, both in the laboratory and also with a comprehensive literature review of the utility and relevance of estrogen receptor antagonism and exercise behavior. We studied the running patterns of female rats, including the duration, speed, and total running distance, under normal physiological conditions. Daily injections of ICI-182780, a potent estrogen receptor antagonist, were then administered for a week, followed by a period of rebound observation as the antagonist left the system. We found that upon administration of ICI-182780, the cyclic running pattern terminated, and estrogen-mediated running behaviors decreased as the estrogen receptors were blocked. During the rebound observation period, running behaviors slowly returned, and the cyclic pattern began to reestablish as the estrogen receptors recovered from inhibition. This study and literature review allows us to better understand sex-specific mechanisms that contribute to physical activity through an in-depth investigation of estrogen/estrogen receptor interactions.
