Blood flow remains unchanged during contraction, while compressive regions increase their vascularity to offset metabolic demands.

Blood flow increases are proportional across all tendon regions, eliminating site-specific injury risk.

The rise in blood flow primarily supports surrounding muscle, with negligible benefit for tendon cellular metabolism.

 Increased blood flow during loading supplies ATP for collagen synthesis, promoting efficient repair; however, compressive regions with fibrocartilage show less vascular response, predisposing them to degenerative changes.