Related Experiment Video
Updated: Jun 10, 2026
07:52
Assessment of Murine Exercise Endurance Without the Use of a Shock Grid: An Alternative to Forced Exercise
Published on: August 14, 2014
Selection for intrinsic endurance modifies endocrine stress responsiveness
R Parrish Waters1, Kenneth J Renner, Cliff H Summers
1Department of Neurosciences, The Medical University of South Carolina, Charleston, SC 29425, USA. watersrp@musc.edu
Brain Research
|August 5, 2010
Summary
High endurance capacity in rats is genetically linked to a heightened stress response, contrary to exercise
Area of Science:
- Neuroscience
- Behavioral Science
- Genetics
Background:
- Physical exercise is known to reduce stress and anxiety symptoms.
- The intrinsic relationship between exercise capacity and the body's stress response remains unclear.
- Understanding this intrinsic link is crucial for developing targeted interventions.
Purpose of the Study:
- To investigate the intrinsic relationship between exercise endurance and stress responsiveness.
- To determine if genetic factors influence the interplay between physical capacity and psychological stress.
Main Methods:
- Utilized NIH rats bidirectionally selected for high (HCR) and low (LCR) intrinsic endurance capacity.
- Assessed anxiety-like behaviors using the elevated plus maze (EPM) and novel environment tests.
- Measured plasma corticosterone levels pre- and post-stress (restraint, EPM) and after dexamethasone suppression.
Main Results:
- High capacity runners (HCR) exhibited more anxiety-like behaviors post-restraint and in a novel environment compared to low capacity runners (LCR).
- HCR rats showed increased plasma corticosterone levels following EPM and restraint stress, unlike LCR rats.
- Both HCR and LCR rats demonstrated similar negative feedback regulation of corticosterone release.
Conclusions:
- A positive genetic correlation exists between exercise endurance capacity and stress responsiveness.
- This finding challenges the conventional understanding of exercise's impact on stress regulation.
- Genetic predisposition may influence an individual's susceptibility to stress based on their physical capacity.
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