Mixed
Twelve weeks of whole-body resistance training increases resting brachial artery diameter and postocclusion blood flow in young healthy men, but does not improve flow-mediated dilation (FMD) of conduit arteries.
If you lift weights, your arteries likely get wider and handle blood flow better, which is good for long-term health. However, don't expect resistance training to fix 'stiff' arteries in the same way cardio might. It’s a different type of adaptation: structural and flow-based rather than dilation-based.
These results show that short-term (12 wk) resistance training in healthy young men can induce an increase in resting arterial diameter... In addition, the greater postocclusion blood flow suggests resistance vessel... function... However, unlike studies involving endurance training, flow-mediated dilation did not increase with resistance training.
Why this rating
Prospective longitudinal design with a relatively large sample size (n=28) and rigorous control of confounding variables (diet, caffeine, time of day).
Source
Endothelial function of young healthy males following whole body resistance training
Mark Rakobowchuk et al. · Journal of Applied Physiology · 2005
DOI 10.1152/japplphysiol.01290.2004
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