Table 3. Percent difference in the changes in blood and running parameters after either Live High:Train Low (LHTL) altitude training or Intermittent Hypoxic Exposure (IHE) compared with Placebo. LHTL IHE Placebo SWC (%) Diff. from Placebo (± 90% CL) Qualitative Inference Diff. from Placebo (± 90% CL) Qualitative Inference Diff. from Placebo (± 90% CL) Qualitative Inference Blood measures Haemoglobin mass (g) 1.6 3.2 (4.8) Possibly higher –1.4 (4.5) Unclear 4.7 (3.5) Likely higher Serum ferritin (ng·mL-1) 8.2 17.5 (46.6) Unclear 31.0 (40.9) Likely higher –10.3 (43.3) Unclear Soluble transferrin receptor (mg·L-1) 3.0 14.3 (16.9) Likely higher 3.4 (14.1) Unclear 10.5 (12.8) Likely higher Submaximal running Running economy (mL·kg-1·min-1) 1.9 –1.1 (4.2) Unclear 1.7 (3.4) Possibly trivial –2.8 (4.4) Possibly lower 3mM [La] running speed (km·h-1) .8 4.4 (4.5) Likely higher 2.7 (3.7) Unclear 1.7 (4.6) Unclear Maximal running VO2max (L·min-1) 1.5 1.7 (9.0) Unclear 3.9 (7.1) Unclear –2.1 (8.5) Unclear vVO2max (km·h-1) .9 1.7 (9.7) Unclear 1.3 (8.3) Unclear .4 (9.5) Unclear TTE (s) 3.0 –.1 (20.0) Unclear –4.7 (12.2) Unclear 4.8 (20.0) Unclear Maximal heart rate (beats·min-1) .8 –5.7 (3.4) Very likely lower –3.0 (2.8) Likely lower –2.8 (3.5) Likely lower Maximal [La] (mM·L-1) 3.5 –32.4 (27.2) Very likely lower –20.7 (26.8) Likely lower –14.7 (32.4) Unclear Values are the net difference between groups of the percent change in variables from pre-camp to post-camp with 90% confidence limits (± 90% CL). Smallest Worthwhile Change in the variable, expressed as a percentage: SWC. Differences: Diff. Blood lactate concentration: [La]. Maximal oxygen consumption: VO. Running velocity at VO: vVO. Running time to exhaustion: TTE.