As during submaximal exercise does not, in general, increase linearly with BM, reporting RE with respect to the 0.75 power of BM has been recommended. When tracking RE between or within groups it is important to account for BM. Under controlled conditions, RE is a stable test capable of detecting relatively small changes elicited by training or other interventions. In order to determine whether changes in RE are real or not, careful standardisation of footwear, time of test and nutritional status are required to limit typical error of measurement. RE is traditionally measured by running on a treadmill in standard laboratory conditions, and, although this is not the same as overground running, it gives a good indication of how economical a runner is and how RE changes over time. There is a strong association between RE and distance running performance, with RE being a better predictor of performance than maximal oxygen uptake () in elite runners who have a similar. Taking body mass (BM) into consideration, runners with good RE use less energy and therefore less oxygen than runners with poor RE at the same velocity. Abstract : Running economy (RE) is typically defined as the energy demand for a given velocity of submaximal running, and is determined by measuring the steady-state consumption of oxygen () and the respiratory exchange ratio.
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