Prior SARS-CoV-2 Infection Does Not Increase Heat Stress During Exercise

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Researchers from High Point University examined the physiological and immune responses of individuals with prior clinical diagnosis of SARS-CoV-2 infection who underwent cycling exercise in hot, moderately humid conditions. The study found that, despite prior infection, participants did not experience increased heat stress or elevated physiological responses during exercise. However, they did show increased levels of anti-inflammatory cytokines and direct anti-viral activity in response to exertional heat stress.

Key Takeaways:

  • The study involved 14 men and 6 women with a mean age of 21 years, who were previously diagnosed with SARS-CoV-2 and underwent 1 hour of cycling exercise in hot, moderately humid conditions.
  • Physiological parameters such as heart rate, esophageal temperature, and mean body temperature were measured throughout exercise and did not show significant differences between participants with prior SARS-CoV-2 infection and the control group.
  • However, the study found that participants with prior SARS-CoV-2 infection had increased levels of interleukin 1 receptor antagonist (IL-1RA) and interferon gamma (IFN-gamma) in response to exercise, indicating maintained immunocompetence.
  • The study implies that individuals with prior SARS-CoV-2 infection may not be at increased risk of exertional heat stress during exercise in hot, moderately humid conditions.
  • The study was funded by High Point University and included authors from High Point University, Department of Health and Human Performance, and other institutions.

Statistics:

  • 20 participants were involved in the study, with 14 men and 6 women.
  • 10 participants had prior SARS-CoV-2 infection, while 10 served as the control group.
  • The study found no significant differences in heart rate (HR), esophageal temperature (T-c), and mean body temperature (T-b) between participants with prior SARS-CoV-2 infection and the control group during exercise.
  • IL-1RA levels increased by 195% in participants with prior SARS-CoV-2 infection at 1 hour post-exercise, while IFN-gamma levels increased by 105% in the same group.

Sources:

  • "Prior Sars-cov-2 Infection Does Not Increase Heat Stress During One Hour of Exercise In a Hot and Moderately Humid Environment." European Journal of Applied Physiology, 2025.

(Note: The source is cited exactly as it appears in the original text.)