23‏/2‏/2017

MCQ : Exercise and the immune system


Which of the following statements regarding
exercise and the immune system is true?

a. white blood cells decrease during exercise
b. salivary and nasal immunoglobulin A (IgA) is
increased for 24 hours after strenuous exercise
c. exercising at moderate intensity appears to
enhance immune function
d. lymphocytes decrease during exercise
e. none of the above


The correct answer is (c)
Exercising at moderate intensity appears to
enhance immune function. When exercising at moderate levels, athletes tend to experience fewer viral infections. Elite or high-level athletes, however, complain of frequent viral infections when training hard or after competitions. There is a transient increase in white blood cells and lymphocytes during exercise. Salivary
and nasal IgA levels decrease after strenuous exercise and return to normal within 24 hours of rest. This may explain the increased susceptibility to viral illness after strenuous exercise.




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