WillH4450 WillH4450

20-02-2020
Health

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When subjects perform a fitness test in which they are pushed to their maximum heart rate (i.e. not stopping at 80% of max), the are encouraged to continue biking slowly for an additional minute afterwards in order to cool down. Sometimes, if the subject does not cool down, they pass out. What is the most likely explanation for why they passed out

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calisorenson calisorenson

20-02-2020

Answer:

Heart rate decreased suddenly and then MAP immediately fell because peripheral blood vessels were extensively vasodilated. This is due to vasovagal reflex, a reflex triggered by stress, holding your breath, pin etc. This causes heart rate to slow down causing blood vessels to widen; as a result blood gets accumulated in the lower body and only less blood flows to the brain.

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