Fig. 3. Percentage changes in levels of mRNAs coding for the regulatory subunit of hypoxia-inducible factor-1 (HIF-1) (A), phosphofructokinase (PKF) (B), myoglobin (C) and vascular endothelial growth factor (VEGF) (D) after 6 weeks of endurance training in hypoxia (Hyp) or normoxia (Nor) at individual anaerobic threshold (high) or at a level of training approximately 25% below individual anaerobic threshold (low) (Vogt et al., 2001). Pre-training values are normalized to 100%. Values are means + S.E.M. (N=8 for both normoxia groups; N=7 for both hypoxia groups). *Significant difference between pre- and post-training values (P<0.05); 
a tendency for a difference between pre- and post-training values (P<0.10).
