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- Title
Physiological correlates of 2-mile run performance as determined using a novel on-demand treadmill.
- Authors
Tolfrey, Keith; Hansen, Simon A.; Dutton, Katie; McKee, Tom; Jones, Andrew M.
- Abstract
The purpose of this study was to assess the reproducibility of an on-demand motorised treadmill to measure 2-mile (3.2 km) race performance and to examine the physiological variables that best predict this free-running performance in active men. Twelve men (mean (SD): age, 28 (9) years; stature, 1.79 (0.05) m; body mass, 72 (9) kg) completed the study in which maximum oxygen uptake (VO2 max<span class="absinlineequation"><img src="/cisti/journals/rp/gifs/h09-069ie1h.gif" /></span>s in the abstract section. They appear in the rest of the paper.), running economy, and running speed at VO2 max (vVO2 max), lactate threshold (vLT), and 4 mmol·L-1 fixed blood lactate concentration (v4) were measured. Subsequently, the maximal lactate steady state (MLSS) was identified using a series of 30-min treadmill runs. Finally, each participant completed a 2-mile running performance trial on 2 separate occasions, using an on-demand treadmill that adjusts belt speed according to the participant’s position on the moving belt. The average 2-mile run speed was 15.7 (SD, 1.9) km·h-1, with small individual differences between repeat-performance trials (intraclass correlation coefficient = 0.99, 95% CI 0.953 to 0.996; standard error of measurement as coefficient of variation = 1.5%, 95% CI 1.0% to 2.5%). Bivariate regression analyses identified VO2 max, vVO2 max, VO2 (mL·kg-1·min-1) at MLSS, vLT, v4, and velocity at MLSS (vMLSS) as the strongest individual predictor variables (r2 = 0.69 to 0.87; standard error of the estimate = 1.08 to 0.72 km·h-1) for 2-mile running performance. The vLT and vMLSS explained 85% and 87% of the variance in running performance, respectively, suggesting that there is considerable shared variance between these parameters. In conclusion, the on-demand treadmill system provided a reliable measure of distance running performance. Both vLT and vMLSS were strong predictors of 2-mile running performance, with vMLSS explaining marginally more of the variance.
- Subjects
EXERCISE physiology; PHYSIOLOGICAL research; ANAEROBIC threshold; MEASUREMENT errors; MEN'S health
- Publication
Applied Physiology, Nutrition & Metabolism, 2009, Vol 34, Issue 4, p763
- ISSN
1715-5312
- Publication type
Article
- DOI
10.1139/H09-069