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Department of Anesthesiology and General Clinical Research Center, Mayo Clinic and Foundation, Rochester, Minnesota 55905
In sedentary
individuals, postexercise hypotension after a single bout of aerobic
exercise is due to a peripheral vasodilation. Endurance exercise
training has the potential to modify this response and perhaps reduce
the degree of postexercise hypotension. We tested the hypothesis that
endurance exercise-trained men and women would have blunted
postexercise hypotension compared with sedentary subjects but that the
mechanism of hypotension would be similar (i.e., vasodilation). We
studied 16 endurance-trained and 16 sedentary men and women. Arterial
pressure, cardiac output, and total peripheral resistance were
determined before and after a single 60-min bout of exercise at 60%
peak oxygen consumption. All groups exhibited a similar degree
of postexercise hypotension (~4-5 mmHg; P < 0.05 vs. preexercise). In sedentary men and women, hypotension was the
result of vasodilation (
resistance: 
8.9 ± 2.2%). In
endurance-trained women, hypotension was also the result of
vasodilation (8.1 ± 4.1%). However, in endurance-trained men,
hypotension was the result of a reduced cardiac output (5.2 ± 2.4%; P < 0.05 vs. all others) and vasodilation was
absent (0.7 ± 3.3%; P < 0.05 vs. all others).
Thus we conclude the magnitude of postexercise hypotension is similar
in sedentary and endurance-trained men and women but that
endurance-trained men and women achieve this fall in pressure via
different mechanisms.
cardiovascular deconditioning; blood pressure; cardiac output; vasodilator agents
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