Saturday Morning Poster Presentations: Posters displayed from 7:30–11:00 a.m.: One-hour author presentation times are staggered from 8:00–9:00 a.m., 9:00–10:00 a.m., and 10:00–11:00 a.m.: G-19 Free Communication/Poster – Physical Activity, Cognition and Cognitive Function: SATURDAY, JUNE 3, 2006 8:00 AM – 11:00 AM ROOM: Hall B
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.