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• W2949580033 abstract "PurposeThe use of oxygen cost ((dot{O})aero) parameters to predict endurance performance has recently been criticized. Instead, it is suggested that aerobic energy cost ((dot{E}_{text{aero}})) provides greater validity; however, a comparison of these quantification methods has not previously been made.MethodsFifty-six male (n = 34) and female (n = 22) competitive adolescent (17 ± 1 years) middle-distance runners participated in a sub-maximal and maximal incremental treadmill test. Running economy (RE) was measured at the speed corresponding to lactate turnpoint, and the three speeds prior. Maximal oxygen uptake ((dot{V})O2max), speed at (dot{V})O2max and fraction of (dot{V})O2max utilized across a range of intensities, and speeds from 0.8, 1.5 and 3 km races were also quantified. RE and fractional utilization were calculated in units of (dot{O})aero and (dot{E})aero.ResultsMultiple linear regression models demonstrated no discernible difference in the predictive capability of RE, fractional utilization and (dot{V})O2max when expressed as (dot{O})aero or (dot{E})aero in both sexes. When plotted as a function of running speed, (dot{O})aero displayed a stepwise decrease (F = 11.59, p < 0.001) whereas (dot{E})aero exhibited a curvilinear response (F = 4.74, p = 0.015). Differences were also evident in the slopes plotted for %(dot{V})O2max and %(dot{E})aeromax against running speed (F = 5.38, p = 0.021).ConclusionsQuantifying aerobic determinants of performance in units of (dot{E})aero provides no greater validity compared to (dot{O})aero-based measurement. Although both (dot{E})aero and (dot{O})aero are sensitive to changes in speed, (dot{E})aero provides the more valid reflection of the underlying metabolic cost of running. Physiologists should also be aware of the potential differences between expression of aerobic running intensity based upon %(dot{V})O2max compared to %(dot{E})aeromax." @default.
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• W2949580033 date "2019-06-17" @default.
• W2949580033 modified "2023-10-01" @default.
• W2949580033 title "Quantification of aerobic determinants of performance in post-pubertal adolescent middle-distance runners" @default.
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• W2949580033 doi "https://doi.org/10.1007/s00421-019-04175-w" @default.
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