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Does exercise stress alter susceptibility to bacterial infections?
N G Ilbäck1, D J Crawford, H A Neufeld
1United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21701.
Upsala Journal of Medical Sciences
|January 1, 1991
Summary
Swimming exercise impacts disease susceptibility and performance. Strenuous exercise before infection reduced susceptibility, while exercise after infection increased mortality in rats.
Area of Science:
- Exercise physiology
- Immunology
- Microbiology
Background:
- Swimming is a common exercise modality.
- Streptococcus pneumoniae and Francisella tularensis are significant pathogens.
- Exercise can modulate immune responses and disease susceptibility.
Purpose of the Study:
- To evaluate swimming's effect on performance capacity.
- To investigate exercise stress influence on susceptibility to S. pneumoniae and F. tularensis infections.
- To compare susceptibility and disease progression between Fisher-Dunning (FD) and Sprague-Dawley (SD) rat strains.
Main Methods:
- Rats (FD and SD strains) underwent swimming protocols.
- Performance capacity was assessed.
- Susceptibility to S. pneumoniae and F. tularensis infections was evaluated.
- Disease lethality was monitored in relation to exercise timing.
Main Results:
- Both infections reduced performance capacity, dose-dependently.
- FD rats exhibited higher susceptibility and greater performance deterioration than SD rats.
- Exercise timing significantly altered disease outcomes: pre-infection exercise reduced susceptibility, while post-infection exercise increased mortality.
Conclusions:
- Exercise stress differentially affects susceptibility and mortality depending on its timing relative to infection.
- Rat strain influences disease severity and response to exercise stress.
- Understanding exercise-infection interactions is crucial for health and performance.