caa a22 4500 469054824 CHVBK 20180323132840.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00705073 doi (NATIONALLICENCE)springer-10.1007/BF00705073 Oxygen uptake during running as related to body mass in circumpubertal boys: a longitudinal study [Elektronische Daten] [Bertil Sjödin, Jan Svedenhag] Summary: To investigate the effect of endurance training on physiological characteristics during circumpubertal growth, eight young runners (mean starting age 12 years) were studied every 6 months for 8 years. Four other boys served as untrained controls. Oxygen uptake ( $$\dot V$$ O 2) and blood lactate concentrations were measured during submaximal and maximal treadmill running. The data were aligned with each individual's age of peak height velocity. The maximal oxygen uptake ( $$\dot V$$ O 2max; ml · kg−1 · min−1) decreased with growth in the untrained group but remained almost constant in the training group. The oxygen cost of running at 15 km · h−1 ( $$\dot V$$ O 215, ml · kg−1 · min−1) was persistently lower in the trained group but decreased similarly with age in both groups. The development of $$\dot V$$ O 2max and $$\dot V$$ O 215 (1 · min−1) was related to each individual's increase in body mass so that power functions were obtained. The mean body mass scaling factor was 0.78 (SEM 0.07) and 1.01 (SEM 0.04) for $$\dot V$$ O 2max and 0.75 (SEM 0.09) and 0.75 (SEM 0.02) for $$\dot V$$ O 215 in the untrained and trained groups, respectively. Therefore, expressed as ml · kg−0.75 · min−1, $$\dot V$$ O 215 was unchanged in both groups and $$\dot V$$ O 2max increased only in the trained group. The running velocity corresponding to 4 mmol · 1−1 of blood lactate (ν la4) increased only in the trained group. Blood lactate concentration at exhaustion remained constant in both groups over the years studied. In conclusion, recent and the present findings would suggest that changes in the oxygen cost of running and $$\dot V$$ O 2max (ml · kg−1 · min−1) during growth may mainly be due to an overestimation of the body mass dependency of $$\dot V$$ O 02 during running. The $$\dot V$$ O 2 determined during treadmill running may be better related to kg0.75 than to kg1. Springer-Verlag, 1992 Blood lactate nationallicence Endurance training nationallicence Maximal oxygen uptake nationallicence Running economy nationallicence Scaling factor nationallicence Peak height velocity nationallicence Sjödin Bertil National Defence Research Establishment, Stockholm, Sweden aut Svedenhag Jan Department of Physiology III, Karolinska Institute, Stockholm, Sweden aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/2(1992-03-01), 150-157 0301-5548 65:2<150 1992 65 421 https://doi.org/10.1007/BF00705073 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00705073 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sjödin Bertil National Defence Research Establishment, Stockholm, Sweden aut NATIONALLICENCE 700 1- Svedenhag Jan Department of Physiology III, Karolinska Institute, Stockholm, Sweden aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/2(1992-03-01), 150-157 0301-5548 65:2<150 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer