caa a22 4500 46905400X CHVBK 20180323132838.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF01466276 doi (NATIONALLICENCE)springer-10.1007/BF01466276 Glucose and free fatty acid utilization during prolonged exercise in prepubertal boys in relation to catecholamine responses [Elektronische Daten] [P. Delamarche, M. Monnier, A. Gratas-Delamarche, H. Koubi, M. Mayet, R. Favier] Summary: Ten prepubertal boys performed 60-min cycle exercise at about 60% of their maximal oxygen uptake as previously measured. To measure packed cell volume, plasma glucose, free fatty acids (FFA), glycerol and catecholamines, blood samples were drawn at rest using a heparinized cathether and at the 15th, 30th and 60th min of the exercise and after 30 min of recovery. At rest, the blood glucose concentrations were at the lowest values for normal. Exercise induced a small decrease of blood glucose which was combined with an abrupt increase of the noradrenaline concentration during the first 15 min. The FFA and glycerol concentrations increased throughout the exercise linearly with that of adrenaline. Compared to adults, the FFA uptake expressed per minute and per litre of oxygen uptake was greater in children. These results suggested that it is difficult for children to maintain a constant blood glucose concentration and that prolonged exercise provided a real stimulus to hypoglycaemia. An immediate and large increase in noradrenaline concentration during exercise and a greater utilization of FFA was probably used by children to prevent hypoglycaemia. Springer-Verlag, 1992 Children nationallicence Exercise nationallicence Catecholamines nationallicence Glucose nationallicence Delamarche P. Laboratoire S.T.A.P.S. Physiologie et Biomécanique de l'Exercice Musculaire, Université de Rennes 2, 6 avenue Gaston Berger, F-35043, Rennes Cedex, France aut Monnier M. Laboratoire S.T.A.P.S. Physiologie et Biomécanique de l'Exercice Musculaire, Université de Rennes 2, 6 avenue Gaston Berger, F-35043, Rennes Cedex, France aut Gratas-Delamarche A. Laboratoire S.T.A.P.S. Physiologie et Biomécanique de l'Exercice Musculaire, Université de Rennes 2, 6 avenue Gaston Berger, F-35043, Rennes Cedex, France aut Koubi H. U.R.A. 1341 CNRS Laboratoire de Physiologie, Faculté de Médecine de Grange Blanche, 8 avenue Rockefeller, F-69000, Lyon Cedex, France aut Mayet M. U.R.A. 1341 CNRS Laboratoire de Physiologie, Faculté de Médecine de Grange Blanche, 8 avenue Rockefeller, F-69000, Lyon Cedex, France aut Favier R. U.R.A. 1341 CNRS Laboratoire de Physiologie, Faculté de Médecine de Grange Blanche, 8 avenue Rockefeller, F-69000, Lyon Cedex, France aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 66-72 0301-5548 65:1<66 1992 65 421 https://doi.org/10.1007/BF01466276 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01466276 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Delamarche P. Laboratoire S.T.A.P.S. Physiologie et Biomécanique de l'Exercice Musculaire, Université de Rennes 2, 6 avenue Gaston Berger, F-35043, Rennes Cedex, France aut NATIONALLICENCE 700 1- Monnier M. Laboratoire S.T.A.P.S. Physiologie et Biomécanique de l'Exercice Musculaire, Université de Rennes 2, 6 avenue Gaston Berger, F-35043, Rennes Cedex, France aut NATIONALLICENCE 700 1- Gratas-Delamarche A. Laboratoire S.T.A.P.S. Physiologie et Biomécanique de l'Exercice Musculaire, Université de Rennes 2, 6 avenue Gaston Berger, F-35043, Rennes Cedex, France aut NATIONALLICENCE 700 1- Koubi H. U.R.A. 1341 CNRS Laboratoire de Physiologie, Faculté de Médecine de Grange Blanche, 8 avenue Rockefeller, F-69000, Lyon Cedex, France aut NATIONALLICENCE 700 1- Mayet M. U.R.A. 1341 CNRS Laboratoire de Physiologie, Faculté de Médecine de Grange Blanche, 8 avenue Rockefeller, F-69000, Lyon Cedex, France aut NATIONALLICENCE 700 1- Favier R. U.R.A. 1341 CNRS Laboratoire de Physiologie, Faculté de Médecine de Grange Blanche, 8 avenue Rockefeller, F-69000, Lyon Cedex, France aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 66-72 0301-5548 65:1<66 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer