Loughborough University
Browse
1/1
3 files

Supplementary information files for 'Quantification of aerobic determinants of performance in post-pubertal adolescent middle-distance runners'

figure
posted on 2019-10-01, 08:37 authored by Richard BlagroveRichard Blagrove, Glyn Howatson, Charles R. Pedlar, Philip R. Hayes
Supplementary information files for 'Quantification of aerobic determinants of performance in post-pubertal adolescent middle-distance runners'

Abstract:
Purpose
The use of oxygen cost ( O˙ aero) parameters to predict endurance performance has recently been criticized. Instead, it is suggested that aerobic energy cost ( E˙aero ) provides greater validity; however, a comparison of these quantification methods has not previously been made.

Methods
Fifty-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 ( V˙ O2max), speed at V˙ O2max and fraction of 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 O˙ aero and E˙ aero.

Results
Multiple linear regression models demonstrated no discernible difference in the predictive capability of RE, fractional utilization and V˙ O2max when expressed as O˙ aero or E˙ aero in both sexes. When plotted as a function of running speed, O˙ aero displayed a stepwise decrease (F = 11.59, p < 0.001) whereas E˙ aero exhibited a curvilinear response (F = 4.74, p = 0.015). Differences were also evident in the slopes plotted for % V˙ O2max and % E˙ aeromax against running speed (F = 5.38, p = 0.021).

Conclusions
Quantifying aerobic determinants of performance in units of E˙ aero provides no greater validity compared to O˙ aero-based measurement. Although both E˙ aero and O˙ aero are sensitive to changes in speed, 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 % V˙ O2max compared to %E˙ aeromax.

History

School

  • Sport, Exercise and Health Sciences

Usage metrics

    Sport, Exercise and Health Sciences

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC