Time-course of changes in cardiac function during recovery after acute exercise
Karen Y Wonders1, David S Hydock, Reid Hayward
1Department of Health, Physical Education, and Recreation, Wright State University, Dayton, OH 45435, USA.
Summary
A single bout of prolonged exercise impaired cardiac function for up to 48 hours in previously untrained rats. This exercise-induced cardiac dysfunction was linked to increased lipid peroxidation and reduced antioxidant potential.
Area of Science:
- Exercise physiology
- Cardiovascular research
- Biochemistry
Background:
- Exercise-induced cardiac dysfunction (EICD) is documented in trained individuals.
- Data on EICD in untrained populations days after exercise are limited and conflicting.
- Understanding post-exercise cardiac recovery in sedentary individuals is crucial.
Purpose of the Study:
- To investigate the impact of acute exercise on cardiac function in untrained rats.
- To determine the duration of cardiac dysfunction following exhaustive exercise.
- To identify mechanisms contributing to exercise-induced cardiac dysfunction.
Main Methods:
- Rats underwent a single bout of treadmill exercise.
- Cardiac function was assessed ex vivo at 0, 24, 48, and 72 hours post-exercise.
- Cardiac tissue was analyzed for malondialdehyde (MDA) and antioxidant potential (AOP).
Main Results:
- Cardiac function (left ventricular pressure, dP/dtmax, dP/dtmin) decreased significantly up to 48 hours post-exercise.
- Malondialdehyde (MDA) levels, an indicator of lipid peroxidation, were elevated at 0, 24, and 48 hours.
- Antioxidant potential (AOP) decreased at 24 and 48 hours post-exercise.
- Cardiac function, MDA, and AOP returned to baseline by 72 hours.
Conclusions:
- A single bout of prolonged, moderate exercise impairs cardiac function in previously sedentary rats for up to 48 hours.
- Increased lipid peroxidation and decreased antioxidant potential are associated with this exercise-induced cardiac dysfunction.
- Cardiac function recovers within 72 hours post-exercise in this model.
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