Int J Sports Med 1981; 02(4): 228-230
DOI: 10.1055/s-2008-1034614
© Georg Thieme Verlag Stuttgart · New York

Prolonged Exercise in 14-Year-Old Girls

M. Máček, J. Vávra
  • Laboratory for Physical Fitness Research, Faculty of Pediatrics, Charles University, Prague
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Publication History

Publication Date:
14 March 2008 (online)

Abstract

The circulatory and metabolic changes during prolonged exercise (60 min) were studied in a group of eight healthy pubertal girls. The girls worked on the treadmill and on the bicycle ergometer at 43%-47% of the respective V̇O2max, i.e., 1.2 W/kg body weight (BW) on the bicycle and 4 km/h with 5% inclination on the treadmill. The heart rate increase during prolonged exercise was the same in both types of exercise. The blood lactate increase was negligible in the initial phase with subsequent removal from the blood during extended exercise.

The increasing free glycerol concentration in blood indicates similar fat share in energy release in children and adults. No biologic handicap could be found for prolonged exercise in pubertal girls.