Figure 2.

Iron isotope data for the vastus lateralis muscle of young and old participants. (A) Comparison by one-way ANOVA of δ⁵⁶Fe among young participants (n = 11) and high- (HF, n = 16) and low-functioning (LF, n = 7) older adults. (B) Linear regression analysis between δ⁵⁷Fe and δ⁵⁶Fe in young and old participants. (C) Relationship between total Fe levels and δ⁵⁶Fe in young and old participants as assessed by Pearson’s test. In (A) bars represent mean values (±standard deviation) for the three experimental groups. Values are expressed as ppm Fe. * p < 0.05 vs. young group.