The aerobic cost of running (CR), an important determinant of running performance, is usually measured during constant speed running. However, constant speed does not adequately reflect the nature of human locomotion, particularly competitive races, which include stochastic variations in pace. Studies in non‐athletic individuals suggest that stochastic variations in running velocity produce little change in CR. This study was designed to evaluate whether variations in running speed influence CR in trained runners. Twenty competitive runners (12 m, VO2max=73 + 7 ml/kg; 8f, VO2max=57 + 6 ml/kg) ran four 6‐minute bouts at an average speed calculated to require ~90% ventilatory threshold (VT) (measured using both v‐slope and ventilatory equivalent). Each interval was run with minute‐to‐minute pace variation around average speed. CR was measured over the last 2 min. The coefficient of variation (CV) of running speed was calculated to quantify pace variations: + 0.0 m∙s‐1 (CV = 0%), + 0.04 m∙s‐1 (CV = 1.4%), + 0.13 m∙s‐1(CV = 4.2%), and + 0.22 m∙s‐1(CV = 7%). No differences in CR, HR, or blood lactate (BLa) were found amongst the variations in running pace. Rating of perceived exertion (RPE) was significantly higher only in the 7% CV condition. The results support earlier studies with short term (3s) pace variations, that pace variation within the limits often seen in competitive races did not affect CR when measured at running speeds below VT.
|Number of pages||6|
|Journal||International Journal of Environmental Research and Public Health|
|Publication status||Published - 19 Feb 2021|
Bibliographical noteSpecial Issue: Physiological and Mechanical Performance Determinants in Running.
Funding: The project was funding by a Research, Scientific and Educational Leadership grant to Madeline Ranum from the Graduate Council of the University of Wisconsin‐La Crosse
The project was funding by a Research, Scientific and Educational Leadership grant to Madeline Ranum from the Graduate Council of the University of Wisconsin?La Crosse.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Copyright 2021 Elsevier B.V., All rights reserved.
- Cost of running
- Running performance