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%Change in FBF (A) and forearm vascular conductance (FVC; B) during hyperoxic exercise with and without vitamin C. The figure represents the “responders” vs. “nonresponders”. Vitamin C significantly improved the FBF (A) and FVC (B) only in the group that had a >20% change with hyperoxic exercise. Values are means ± SE; n = 4 (>20% group), n = 3 (10–20% group), and n = 5 subjects (<10% group). *P < 0.05 vs. hyperoxia saline.
