caa a22 4500 469054336 CHVBK 20180323132839.0 cr unu---uuuuu 170328e19920501xx s 000 0 eng 10.1007/BF00705089 doi (NATIONALLICENCE)springer-10.1007/BF00705089 Relationship between plasma ammonia and blood lactate concentrations after maximal treadmill exercise in circumpubertal girls and boys [Elektronische Daten] [K. Nazar, B. Dobrzyński, R. Lewicki] Summary: The purpose of the study was to define a relationship between plasma ammonia [NH3]p1 and blood lactate concentrations [1a−]b after exercise in children and to find out whether the [NH3]p1, determined during laboratory treadmill tests, may be useful as a predictor of the children's sprint running ability. A group of 20 girls and 14 boys trained in athletics or swimming and 8 untrained boys, aged 13.2 to 13.7 years, participated in the study. Their [NH3]p1 and [1a−]b were measured before and after incremental maximal treadmill exercise. In addition, the subjects' running performance was tested in 30-, 60- and 600- or 1000-m runs under field conditions. The [NH3]p1 during the treadmill runs increased by 20.1 (SD 17.3), 24 (SD 16.7) and 10 (SD 4.3) μmol·1−1 in the girls, the trained boys and the untrained boys, respectively. The postexercise [NH3]p1 correlated positively with [1a−]b (r=0.565 in the girls and 0.812 in the boys) and treadmill speed attained during the test (r=0.489 in the girls and 0.490 in the boys). Significant correlations were also found between [NH3]p1 obtained during the treadmill test and the times of 30- and 60-m runs (r= −0.676 and −0.648, respectively) in the boys but not in the girls. A comparison of the present data with those reported previously in adults showed that increases in [NH3]p1 during maximal exercise in children would seem to be lower than in adult subjects both in absolute values and in relation to [1a−]b. The present data would also suggest that [NH3]p1 reflects involvement of anaerobic processes during maximal treadmill exercise in circumpubertal children but it has a small practical value for predictiton of their sprint running ability. Springer-Verlag, 1992 Children nationallicence Exercise nationallicence Ammonia nationallicence Lactate nationallicence Running performance nationallicence Nazar K. Department of Applied Physiology, Medical Research Centre, Polish Academy of Sciences, 17 Jazgarzewska Str., 00-730, Warsaw, Poland aut Dobrzyński B. Institute of Sport, Warsaw, Poland aut Lewicki R. Department of Sports Medicine, Military School of Medicine, Łódź, Poland aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/3(1992-05-01), 246-250 0301-5548 65:3<246 1992 65 421 https://doi.org/10.1007/BF00705089 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00705089 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nazar K. Department of Applied Physiology, Medical Research Centre, Polish Academy of Sciences, 17 Jazgarzewska Str., 00-730, Warsaw, Poland aut NATIONALLICENCE 700 1- Dobrzyński B. Institute of Sport, Warsaw, Poland aut NATIONALLICENCE 700 1- Lewicki R. Department of Sports Medicine, Military School of Medicine, Łódź, Poland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/3(1992-05-01), 246-250 0301-5548 65:3<246 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer