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dc.contributor.authorLandgraff, Hege Elisabeth W.
dc.contributor.authorHallén, Jostein
dc.date.accessioned2021-09-24T10:26:42Z
dc.date.available2021-09-24T10:26:42Z
dc.date.created2020-11-09T13:57:52Z
dc.date.issued2020
dc.identifier.citationMedicine & Science in Sports & Exercise. 2020, 52(9), 1940-1947.en_US
dc.identifier.issn0195-9131
dc.identifier.urihttps://hdl.handle.net/11250/2781362
dc.descriptionDette er siste tekst-versjon av artikkelen, og den kan inneholde små forskjeller fra forlagets pdf-versjon. Forlagets pdf-versjon finner du her: http://dx.doi.org/10.1249/MSS.0000000000002338 / This is the final text version of the article, and it may contain minor differences from the journal's pdf version. The original publication is available here: http://dx.doi.org/10.1249/MSS.0000000000002338en_US
dc.description.abstractPurpose Natural growth and maturation cause hemoglobin mass (Hbmass) and blood volume (BV) to increase during childhood and adolescence. Whether endurance training during the same period can cause further increases in these variables is not clear. Also, body composition develops differently in girls and boys during puberty, and the effect of these differences on hematological variables has not been previously studied. Methods Forty-two endurance athletes (End group; 24 boys) and 34 athletes from other sports (non-End group; 23 boys) were tested at ages 12, 13, and 15 yr for Hbmass, BV, plasma volume (PV), red cell volume (RCV), hematological variables, and anthropometrics. Results: At age 12 yr, Hbmass and BV showed no difference between sexes and training groups in absolute values or relative to fat-free mass (FFM). Relative to FFM, Hbmass and BV averaged 11.7 (0.8) g·kg−1 and 95 (6.8) mL·kg−1. Increases in FFM from ages 12 to 15 yr primarily determined the increased Hbmass and BV for both sexes with no differences between training groups. At age 15 yr, Hbmass relative to FFM was higher in boys than girls, 13.1 (0.8) g·kg−1 and 12.1 (0.9) g·kg−1 (P < 0.001), whereas BV relative to FFM was not significantly different between sexes and training groups at any ages, averaged 100 (6.7) mL·kg−1 at age 15 yr. Relative to FFM, PV was higher in the End group at all ages, and RCV was, on average, lower and increased less compared with non-End group. Conclusion: Our results indicate that increases in Hbmass during puberty are mainly associated with increased FFM and independent of sex or volume of endurance training. However, the FFM-relative PV was higher and the FFM-relative RCV was lower in the End group compared with the non-End group.en_US
dc.language.isoengen_US
dc.subjecthemoglobin massen_US
dc.subjectblood volumesen_US
dc.subjectlongitudinalen_US
dc.subjectadolescentsen_US
dc.subjectgrowthen_US
dc.titleLongitudinal Training-related Hematological Changes in Boys and Girls from Ages 12 to 15 yren_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.source.pagenumber1940-1947en_US
dc.source.volume52en_US
dc.source.journalMedicine & Science in Sports & Exerciseen_US
dc.source.issue9en_US
dc.identifier.doi10.1249/MSS.0000000000002338
dc.identifier.cristin1846206
dc.description.localcodeInstitutt for fysisk prestasjonsevne / Department of Physical Performanceen_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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