Administration of i.v. iron to iron-deficient preoperative patients with mild anaemia is associated with increases in [Hb], tHb-mass and \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\dot{\text{V}}$$\end{document}V ̇ O2 peak. This evidence concerns the gene GSTM1 and anemia (phenotype).