Effect of exercise training on vascular function in active and inactive vascular beds

Deirdre Upton

    Research output: Types of ThesisMaster's Thesis

    Abstract

    Introduction: Evidence exists that regular aerobic exercise benefits vascular health. This beneficial effect is potentially related to repeated increases in the flow of blood across endothelial cells during exercise. We hypothesised that any exercise effect on endothelial dependent dilation is localised to vascular beds in the exercised limb. An additional objective was to determine the effects of exercise training on circulating biomarkers of endothelial activation, including soluble adhesion molecules and cellderived microparticles. Methods: Nine overweight, sedentary men (age 34 ± 4 y (mean ± SD) BMI 29.8 ± 4.3 kg.m-2, VO & 2peak 33.2 ± 4.6 ml.min-1.kg-1, systolic blood pressure 131.8 ± 8.6 mmHg, diastolic blood pressure 82.6 ± 4.6 mmHg) participated in the study. All volunteers underwent a two-week exercise intervention, which comprised of two-legged cycleergometry exercise (30-45 min at 70% VO & 2peak for 5 d of each week) combined with one arm handgrip exercise (one contraction every 2 s at 40% maximum voluntary contraction for half of each exercise session). Allocation of dominant and nondominant arm to handgrip training or control condition was counterbalanced. The control arm remained perfectly still during exercise. Results: Preliminary work indicated the medium term coefficient of variation for various indices of reactive hyperaemia to be between 10 and 15%. Peak reactive hyperaemia increased in both the handgrip and control arms following training (p<0.05) but the increase in the handgrip-trained arm was considerably greater (48 ± 12% vs. 16 ± 8%, p<0.05 for interaction). The duration of reactive hyperaemia and the total reactive hyperaemia increased in the handgrip-trained arm (p<0.05) but was unchanged in the control arm. With the exception of an increase in soluble vascular cell adhesion molecule, training did not influence soluble adhesion molecules or cell derived microparticle counts. Conclusions: Short-term exercise training increases vascular function in active vascular beds with little or no change in inactive beds, in sedentary overweight men. Biomarkers of endothelial activation are largely unaffected by short-term exercise training.
    Original languageEnglish
    Awarding Institution
    Supervisors/Advisors
    • Harrison, Michael, Supervisor
    Publication statusUnpublished - 2009

    Keywords

    • Exercise training, Vascular function

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