caa a22 4500 469055170 CHVBK 20180323132841.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00843756 doi (NATIONALLICENCE)springer-10.1007/BF00843756 Oxygen delivery does not limit peak running speed during incremental downhill running to exhaustion [Elektronische Daten] [Greg Liefeldt, Timothy Noakes, Steven Dennis] Summary: Oxygen consumption ( $$\dot VO_2 $$ ), ventilation ( $$\dot V_I $$ ), respiratory exchange ratio (R), stride frequency and blood lactate concentrations were measured continuously in nine trained athletes during two continuous incremental treadmill runs to exhaustion on gradients of either 0‡ or −3°. Compared to the run at 0° gradient, the athletes reached significantly higher maximal treadmill velocities but significantly lower $$\dot VO_2 $$ , $$\dot V_I $$ ,R and peak blood lactate concentrations (P<0.001) during downhill running. These lower $$\dot VO_2 $$ and blood lactate concentrations at exhaustion indicated that factors other than oxygen delivery limited maximal performance during the downhill run. In contrast, stride frequencies were similar at each treadmill velocity; the higher maximal speed during the downhill run was achieved with a significantly longer stride length (P<0.001); maximal stride frequency was the same between tests. Equivalent maximal stride frequencies suggested that factors determining the rate of lower limb stride recovery may have limited maximal running speed during downhill running and, possibly, also during horizontal running. Springer-Verlag, 1992 $$\dot VO_{2\max } $$ nationallicence Downhill running nationallicence Stride frequency nationallicence Liefeldt Greg Liberty Life Chair of Exercise and Sports Science, and Medical Research Council, University of Cape Town Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925, South Africa aut Noakes Timothy Liberty Life Chair of Exercise and Sports Science, and Medical Research Council, University of Cape Town Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925, South Africa aut Dennis Steven Liberty Life Chair of Exercise and Sports Science, and Medical Research Council, University of Cape Town Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925, South Africa aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/6(1992-11-01), 493-496 0301-5548 64:6<493 1992 64 421 https://doi.org/10.1007/BF00843756 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00843756 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liefeldt Greg Liberty Life Chair of Exercise and Sports Science, and Medical Research Council, University of Cape Town Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925, South Africa aut NATIONALLICENCE 700 1- Noakes Timothy Liberty Life Chair of Exercise and Sports Science, and Medical Research Council, University of Cape Town Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925, South Africa aut NATIONALLICENCE 700 1- Dennis Steven Liberty Life Chair of Exercise and Sports Science, and Medical Research Council, University of Cape Town Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, 7925, South Africa aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/6(1992-11-01), 493-496 0301-5548 64:6<493 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer