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Forearm blood flow responses to brachial artery infusion of acetylcholine in healthy men. A, young and older sedentary; B, young and older endurance exercise-trained; C, before and after 3 months of daily walking in older men; *P < 0.05; values are mean ±s.e.m. From DeSouza et al. (2000). Reproduced with permission from Journal of Applied Physiology.
