Test-retest reliability of physiological parameters in elite junior distance runners following allometric scaling

Blagrove, Richard, Howatson, Glyn and Hayes, Phil (2017) Test-retest reliability of physiological parameters in elite junior distance runners following allometric scaling. European Journal of Sport Science, 17 (10). pp. 1231-1240. ISSN 1746-1391

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Official URL: http://dx.doi.org/10.1080/17461391.2017.1364301

Abstract

This study aimed to quantify the intra-individual reliability of a number of physiological variables in a group of national and international young distance runners. Sixteen (8 male, 8 female) participants (16.7 ± 1.4 years) performed a submaximal incremental running assessment followed by a maximal running test, on two occasions separated by no more than seven days. Maximal oxygen uptake (V̇O2max), speed at V̇O2max (km h−1), running economy and speed and heart rate (HR) at fixed blood lactate concentrations were determined. V̇O2max and running economy were scaled for differences in body mass using a power exponent derived from a larger cohort of young runners (n = 42). Running economy was expressed as oxygen cost and energy cost at the speed associated with lactate turnpoint (LTP) and the two speeds prior to LTP. Results of analysis of variance revealed an absence of systematic bias between trials. Reliability indices showed a high level of reproducibility across all parameters (typical error [TE] ≤2%; intra-class correlation coefficient >0.8; effect size <0.6). Expressing running economy as energy cost appears to provide superior reliability than using oxygen cost (TE ∼1.5% vs. ∼2%). Blood lactate and HR were liable to daily fluctuations of 0.14–0.22 mmol L−1 and 4–5 beats min−1 respectively. The minimum detectable change values (95% confidence) for each parameter are also reported. Exercise physiologists can be confident that measurement of important physiological determinants of distance running performance are highly reproducible in elite junior runners.

Item Type: Article
Uncontrolled Keywords: Aerobic fitness, youth, testing, endurance
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Becky Skoyles
Date Deposited: 31 Jul 2017 08:35
Last Modified: 15 Nov 2017 12:06
URI: http://nrl.northumbria.ac.uk/id/eprint/31430

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