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Strenuous exercise in warm environment is associated with improved microvascular function in sickle cell trait.

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Individuals with sickle cell trait (AS) exhibit enhanced skin blood flow post-exercise, especially in warm conditions, suggesting altered microvascular function and a slight oxidative imbalance compared to non-carriers (AA).

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Research
  • Hematology

Background:

  • Sickle cell trait (AS) involves carrying both normal and abnormal hemoglobin.
  • Increased risk of exertional collapse in AS individuals, particularly in stressful environments.
  • Understanding microvascular responses in AS during exercise is crucial for athlete and military safety.

Purpose of the Study:

  • To investigate microvascular function in sickle cell trait carriers (AS) versus non-carriers (AA).
  • To examine the influence of intense exercise and environmental temperature (21°C vs. 31°C) on microvascular determinants.
  • To identify potential differences in physiological responses between AS and AA groups.

Main Methods:

  • Nine AS and 11 AA healthy, physically active young men participated.
  • Four experimental sessions included rest and cycling at 21°C and 31°C.
  • Exercise protocols involved submaximal exercise, a test to exhaustion, and high-intensity sprints.

Main Results:

  • Resting skin blood flow (SkBF) was similar between AS and AA groups.
  • SkBF increased with higher ambient temperature (31°C vs. 21°C) for all participants.
  • Immediately post-exercise, SkBF was significantly higher in the AS group compared to the AA group, irrespective of temperature.
  • No significant differences were found in hemorheological parameters, muscle damage, or cardiac injury biomarkers.
  • The AS group showed indications of higher oxidative stress, evidenced by superoxide dismutase levels.

Conclusions:

  • A distinct physiological profile in the AS population includes heightened microvascular reactivity post-maximal exercise.
  • This enhanced response occurs under stressful environmental conditions, particularly heat.
  • A minor pro-/antioxidant imbalance may be present in AS individuals.