GLUCOSE AND FREE FATTY-ACID UTILIZATION DURING PROLONGED EXERCISE IN PREPUBERTAL BOYS IN RELATION TO CATECHOLAMINE RESPONSES

被引:29
作者
DELAMARCHE, P [1 ]
MONNIER, M [1 ]
GRATASDELAMARCHE, A [1 ]
KOUBI, HE [1 ]
MAYET, MH [1 ]
FAVIER, R [1 ]
机构
[1] FAC MED GRANGE BLANCHE, PHYSIOL LAB, CNRS, URA 1341, F-69000 LYONS, FRANCE
关键词
CHILDREN; EXERCISE; CATECHOLAMINES; GLUCOSE;
D O I
10.1007/BF01466276
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
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.
引用
收藏
页码:66 / 72
页数:7
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