Date of Award
Master of Science (MS)
PURPOSE: The purposes of this study were to 1) examine the acute effects of different aerobic exercise durations on large (LAC) and small (SAC) arterial compliance, 2) examine the acute effects of different aerobic exercise durations on central pulse wave velocity (cPWV), peripheral pulse wave velocity (pPWV), Aortic Index (AIx), and 3) to examine the acute effects of aerobic exercise durations on hemodynamics.
METHODS: Eighteen male subjects (age= 23.4±2.0) performed a maximal aerobic stress test (Bruce protocol) in order to estimate VO2max. Participants were required to meet in the lab fasted for at least 8 hours for three sessions. While in the supine position LAC, SAC, and AIx were then assessed. The velocity of pressure waveforms between the carotid and femoral arteries, and the femoral and pedal arteries were measured to assess cPWV and pPWV, respectively. Participants then performed aerobic exercise on a treadmill at 65% of their respective VO2max for 30 min, 45 min, or 60 min in a randomly assigned ordered. Assessments of arterial compliance were then performed immediately post, 10 min, 20 min, and 40 min post exercise.
RESULTS: No significant difference was seen between conditions in compliance of large arteries. A condition main effect was seen suggesting an increase SAC (p
CONCLUSION: Different durations of moderate intensity aerobic exercise did not provoke changes in large arterial elasticity. Longer durations of aerobic exercise may be necessary to modify vascular tone and vessel diameter resulting in reduced small arterial stiffness. The response may be dissimilar for populations with different activity levels. More research is required to examine the effects of different intensities in combination with different durations of aerobic exercise on arterial compliance.
University of Texas Brownsville