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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Tobias ENGEROFF, Andreas BERNARDI, Daniel NIEDERER, Jan WILKE, Lutz VOGT, Winfried BANZER
Goethe-University Frankfurt, Department of Sports Medicine, Frankfurt am Main, Germany
BACKGROUND: Running economy (RE) is often described as a key demand of running performance. The variety of currently used assessment methods with different running intensities and outcomes restricts interindividual comparability of RE in recreational level runners. The purpose of this study was to compare the influence of RE, assessed as Oxygen cost (OC) and Caloric unit cost (CUC), on running speed at individual physiological thresholds.
METHODS: Eighteen recreational runners performed 1) A graded exercise test to estimate first ventilatory threshold (VT1), respiratory compensation point (RCP) and maximal oxygen uptake (VO2max), 2) Discontinuous RE assessment to determine relative OC in millilitres per kilogram per kilometre (ml/kg/km) and CUC in kilocalories per kilogram per kilometre (kcal/kg/km) at three different running intensities: VT1, RCP and at a third standardized reference point (TP) in between.
RESULTS: OC (ml/kg/km; at VT1:235.4±26.2; at TP:227.8±23.4; at RCP:224.9±21.9) and CUC (kcal/kg/km at VT1:1.18±0.13; at TP:1.14±0.12; at RCP:1.13±0.11) decreased with increasing intensities (p≤.01). Controlling for the influence of sex OC and CUC linearly correlated with running speed at RCP and VO2max (p≤.01).
CONCLUSIONS: Running Economy, even assessed at low intensity, is strongly related to running performance in recreational athletes. Both calculation methods used (OC and CUC) are sensitive for monitoring intensity related changes of substrate utilization. RE values decreased with higher running intensity indicating an increase of anaerobic- and subsequent decrease of aerobic substrate utilization.