Naslov
Changes of respiratory exchange ratio in children and adolescents: a longitudinal study

Autori
Jeleč, Željko ; Matković, Branka ; Lebo, Ana ; Jeleč, Dražen ; Matković, Andro

Izvornik
Collegium antropologicum (0350-6134) 39 (2015), 3; 575-582

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
children ; respiratory exchange ratio ; substrate utilization

Sažetak
We conducted a longitudinal study to examine changes in the respiratory exchange ratio (RER) during progressively increasing body exertion in children and adolescents of female sex. In this analysis we only included 23 examinees for whom we had all yearly measurements from examinee's age 9 years until 18 years of age. The data were analyzed according to the chronological and biological age. According to both criteria, the highest RER values were recorded at moments of maximum exertion and they did not increase with age. We found the highest RER values were in the year of the menarche. We interpret these results as related to the effect of estrogen. The beginning of sexual development involves a gradual increase in estrogen plasma concentrations. At one point serum levels of estrogen reach a level high enough to allow for maximum RER values, i.e. causing the optimium anaerobic capacity of the examinee. this threshold estrogen value varies between individuals.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne medicinske znanosti, Kliničke medicinske znanosti, Javno zdravstvo i zdravstvena zaštita, Kineziologija

POVEZANOST RADA