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The Journal of Sports Medicine and Physical Fitness 2007 June;47(2):135-40

Copyright © 2007 EDIZIONI MINERVA MEDICA

language: English

Slow component of V.O2 during level and uphill treadmill running: relationship to aerobic fitness in endurance runners

Reis V. M. 1, Guidetti L. 2, Duarte J. A. 3, Ascensão A. 3, Silva A. J. 1, Sampaio J. E. 1, Russell A. P. 4, Baldari C. 2

1 Department of Sport Sciences University of Trás-os-Montes and Alto Douro, Vila Real, Portugal 2 Department of Health Sciences University Institute of Motor Sciences, Rome, Italy 3 Faculty of Sport Sciences and Physical Education University of Porto, Porto, Portugal 4 Swiss-French Clinic of Rehabilitation, Sion, Switzerland


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Aim. The aim of this study was to compare the oxygen uptake (V.O2) slow component (SC) during level and uphill running in endurance runners, and to identify associations between the SC and the following aerobic fitness indicators: peak V.O2, running speed associated with the peak V.O2 (Vpeak), running speed at the lactic threshold and the V.O2 fraction elicited at the lactic threshold.
Methods. Fourteen male endurance-trained runners underwent several 6-min bouts of level (LTR) and 10.5% uphill treadmill running. V.O2 SC was calculated as the difference between mean V.O2 during the 6th and the 3rd minutes.
Results. The highest mean values for the SC were 181.9±240.2 mL.min-1 for level running at ~94% peak V.O2 and 105.4±154.6 mL.min-1 for uphill running at ~90% peak V.O2. The SC observed during the last bout of the LTR correlated with peak V.O2 and with Vpeak (-0.71 and -0.76, P<0.05, respectively).
Conclusion. The results show that for endurance-trained runners the magnitude of the SC is not affected by the treadmill gradient and that within a homogeneous sample of endurance-trained runners the SC does not correlate with indicators of aerobic fitness

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