Aerobic training and vascular protection: Insight from altered blood flow patterns

Area of Science:

• Exercise Physiology
• Vascular Biology
• Cardiovascular Health

Background:

• Aerobic exercise training is linked to improved vascular health.
• The protective effects of training against acute vascular insults are not well understood.
• Altered blood flow patterns can impair vascular function.

Purpose of the Study:

• To investigate if prior upper limb aerobic training attenuates vascular dysfunction from altered blood flow patterns.
• To compare microvascular and conduit artery function between arm-trained and untrained individuals after an acute vascular insult.

Main Methods:

• Ten arm-trained (AT) and ten untrained (UT) men underwent brachial artery flow-mediated dilation (FMD) tests.
• An acute bout of subdiastolic cuff inflation (SDCI) induced altered shear stress.
• Microvascular function (reactive hyperemia) and conduit artery function (FMD) were assessed pre- and post-SDCI.

Main Results:

• SDCI significantly increased retrograde and oscillatory shear in both groups.
• Microvascular function, but not conduit artery function, was reduced post-SDCI in both AT and UT groups.
• The reduction in microvascular function was similar between the AT and UT groups.

Conclusions:

• Prior upper limb aerobic training does not protect against microvascular dysfunction induced by acute alterations in blood flow patterns.
• Aerobic training adaptations do not confer protection against this specific type of vascular insult.
• Reducing known vascular insults is crucial irrespective of an individual's training status.