Fig. 2From: Effects of supplementing with an 18% carbohydrate-hydrogel drink versus a placebo during whole-body exercise in −5 °C with elite cross-country ski athletes: a crossover studyMean ± SD changes in δ 13CO2 in expired CO2 during the 120-min submaximal exercise bout. cSignificant difference between CHO-HG and PLA (P < 0.0001; n = 12)Back to article page