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Acute Exercise Reduces Vascular Reactivity to Mental Challenge in Normotensive Young Males: 2905Board#180 8:00 AM – 9:00 AM

Boutcher, Stephen H. FACSM; Jones, Justin R.; Park, Young J.; Boutcher, Yati N.

Medicine & Science in Sports & Exercise: May 2006 - Volume 38 - Issue 5 - p S569
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Univ. of New South Wales, Sydney, Australia.

Email: s.boutcher@unsw.edu.au

Previous research has shown that acute exercise blunts limb blood flow response to mental challenge in individuals exhibiting vascular hyper-reactivity. However, the duration of the dampening effect on limb blood flow reactivity caused by acute exercise is undetermined.

PURPOSE: To examine the time course of acute exercise on forearm blood flow (FBF) reactivity to mental challenge in males with hyper-reactive (n=8) and normal limb blood flow response (n=8). METHOD: Subjects (21+0.5 yr) performed a 10-min Stroop mental challenge 33 and 71 min after 20 min of cycle exercise ergometry exercise at 65–70% maximal oxygen uptake. On a separate occasion mental challenge was performed after an attention control task. All subjects completed both conditions and order was counterbalanced. FBF was measured using venous occlusion plethysmography during post-exercise recovery and Stroop. Blood pressure was measured using a Finapres.

RESULTS: Post-exercise FBF reactivity (FBF change from baseline to Stroop) was significantly blunted compared to the control condition at 33 min (30+8.3% versus 115+26.2%) and 71 min (34+5.2% versus 75+25.1%) post exercise only for hyper-reactive blood flow males.

CONCLUSION: Acute exercise significantly reduces FBF response to mental challenge for at least 81 min in young adult males possessing vascular hyper-reactivity.

© 2006 American College of Sports Medicine