A bstract
We examined arterial stiffness, baroreflex sensitivity (BRS), and systolic arterial
pressure (SAP) variability after an acute bout of aerobic exercise compared to resistance
exercise. We hypothesized that arterial stiffness would be reduced after aerobic exercise,
while it would be increased after resistance exercise, and these alterations would
be associated with differential changes in BRS and SAP variability. Arterial stiffness,
BRS, and SAP variability were assessed before and 20 min after a bout of aerobic exercise
and resistance exercise in 13 male participants. Pulse wave velocity (PWV) was used
to measure central (carotid-femoral) and peripheral (femoral-dorsalis pedis) arterial
stiffness. BRS was derived via the sequence technique. Spectral decomposition of beat-to-beat
SAP variability was used as an estimate of sympathetic vasomotor tone. A mode-by-time
interaction (p < 0.001) was detected for central PWV, due to an increase in PWV (p
< 0.05) following resistance exercise and a decrease in PWV following aerobic exercise
(p < 0.05). A mode-by-time interaction was also detected for peripheral PWV (p < 0.05),
due to a decrease in peripheral PWV following aerobic exercise (p < 0.05) with no
change following resistance exercise. BRS was significantly lower following resistance
compared with aerobic exercise (p < 0.004). SAP variability increased following resistance
exercise (p < 0.05) but there was no interaction. In conclusion, aerobic exercise
decreased both central and peripheral arterial stiffness, while resistance exercise
significantly increased central arterial stiffness only. BRS was reduced after both
bouts of exercise, but significantly greater reductions were seen following resistance
exercise.
Key words
Arterial stiffness - baroreflex sensitivity - resistance exercise - blood pressure
variability
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M.S. Kevin S. Heffernan
Department of Kinesiology and Community Health Exercise and Cardiovascular Research Laboratory Rehabilitation Education Center
1207 S. Oak St.
Champaign, IL 61820
USA
Fax: + 1 21 73 33 04 04
eMail: kheffer2@uiuc.edu