VO2 Responses to Running Speeds Above VO2max

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Duffield, Rob and Bishop, David ORCID: 0000-0002-6956-9188 (2008) VO2 Responses to Running Speeds Above VO2max. International Journal of Sports Medicine, 29 (6). pp. 494-499. ISSN 0172-4622


This study compared VO2, heart rate (HR) and electromyographic (iEMG) responses to speeds above the velocity associated with VO2max (v-VO2max). Eight male, middle-distance runners performed a graded exercise test to determine VO2max and v-VO2max and runs to fatigue at 100 % and 110 % v-VO2max. Breath-by-breath VO2 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 VO2 or HR amplitudes or post-run [La-] (p > 0.05). There were significantly faster tau values (p < 0.05) in the 110 % condition in VO2 and HR. No significant correlations were observed between VO2 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 VO2 response was evident, faster running speeds resulted in faster VO2 and HR responses, with no difference in amplitude or % VO2max 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.

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Online ISSN: 1439-3964

Item type Article
URI https://vuir.vu.edu.au/id/eprint/8002
DOI 10.1055/s-2007-989230
Official URL http://dx.doi.org/10.1055/s-2007-989230
Subjects Historical > FOR Classification > 1106 Human Movement and Sports Science
Historical > Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
Keywords ResPubID22039. VO2 kinetics, intense exercise, velocity, oxygen, male athletes, running
Citations in Scopus 6 - View on Scopus
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