Fig. 5
Correlation between change in fluid intake (L kg BM lost−1) and change in continuous exercise performance (Hedges’ g) controlling for ambient environmental temperature, exercise duration, level of dehydration and the ecological validity of the exercise protocol. Circle diameter corresponds to the weight of each study. Hedges g = −0.557 + 0.002 × fluid volume (L kg BM lost−1) + 0.025 × temperature (°C) + 0.011 × exercise duration (min) + 0.218, if ecologically valid + 0.0126 × level of dehydration (% BM lost)