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Blood flow patterns during aerobic and resistance exercise
Author(s) -
Gurovich Alvaro Natalio,
Braith Randy W.
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.24.1_supplement.804.8
Subject(s) - brachial artery , aerobic exercise , femoral artery , turbulence , blood flow , medicine , cardiology , shear stress , endocrinology , chemistry , blood pressure , physics , mechanics
Blood flow (BF)‐induced shear stress regulates endothelial function. BF pattern is defined as either antegrade or retrograde. However, the presence of turbulent flow, quantified by Reynolds number (Re), is another important BF characteristic not normally assessed in vivo. Aerobic (AX) and resistance (RX) exercise have been shown to improve endothelial function, although Re combined with BF pattern has not yet been characterized during exercise. We hypothesized that shear rate (SR) and Re would increase in a dose‐dependent manner during AX and RX. High‐resolution ultrasound imaging and Doppler BF velocity (V) of the brachial and femoral arteries was performed in 8 young, healthy men during rest and bouts of AX and RX at 40 and 70% of VO2max and 1‐RM, respectively. Microhematocrit measurement was used to determine blood density (ρ) and viscosity (μ). Re was calculated using Re=V·artery diameter·ρ/μ. Results show a dose‐dependent increase in antegrade and retrograde SR during AX and RX in both brachial and femoral arteries. Re also increases in a dose‐dependent manner in both antegrade and retrograde BF patterns throughout AX and RX. These preliminary findings suggest that characterization of BF pattern during exercise must include both BF direction and BF turbulence. Including turbulence when defining BF patterns provides a better understanding of the mechanical effects of exercise on endothelial function.