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Int J Sports Med 2008; 29(6): 494-499
DOI: 10.1055/s-2007-989230
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

V·O2 Responses to Running Speeds Above V·O2max

R. Duffield1 , D. Bishop2
  • 1School of Human Movement, Charles Sturt University, Bathurst, Australia
  • 2School of Human Movement and Exercise Science, University of Western Australia, Perth, Australia
Further Information

Publication History

accepted after revision May 22, 2007

Publication Date:
14 November 2007 (online)

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Abstract

This study compared V·O2, heart rate (HR) and electromyographic (iEMG) responses to speeds above the velocity associated with V·O2max (v-V·O2max). Eight male, middle-distance runners performed a graded exercise test to determine V·O2max and v-V·O2max and runs to fatigue at 100 % and 110 % v-V·O2max. Breath-by-breath V·O2 and HR were continuously recorded; lactate [La-] measured pre- and post-run and iEMG measures of rectus femoris (RF) and vastus lateralis were recorded during the first and last 20 s of each run. Analysis indicated longer time to fatigue in the 100 % v-V·O2max run with no differences between conditions for V·O2 or HR amplitudes or post-run [La-] (p > 0.05). There were significantly faster tau values (p < 0.05) in the 110 % condition in V·O2 and HR. No significant correlations were observed between V·O2 or HR tau values and time to fatigue. RF iEMG was significantly larger in 110 % compared to 100 % run in the first 20 s (p < 0.05). While no association between treadmill performance and V·O2 response was evident, faster running speeds resulted in faster V·O2 and HR responses, with no difference in amplitude or % V·O2max attained. This may potentially be as a result of an increased muscle fibre recruitment stimulus during the faster running velocity resulting in faster cardiodynamic responses.

Key words

V·O2 kinetics - severe intensity - athletics - running performance

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Dr. PhD Rob Duffield

Charles Sturt University
School of Human Movement

Panorama Ave

2795 Bathurst

Australia

Phone: + 61 2 63 38 49 39

Fax: + 61 2 63 38 40 65

Email: rduffield@csu.edu.au