Red Cell Values in Healthy Adolescents

Kasper, Carol K.; Wallerstein, Ralph O.

doi:10.1093/ajcn/18.4.286

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…However, incompatibilities due to analytic or ethnic differences may again deny direct comparison. Nevertheless, there were no important differences between the results for our swimmers and the results for healthy adolescents (Kasper and Wallerstein, 1966).…”

Section: Discussioncontrasting

confidence: 56%

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Some haematological characteristics of competitive swimmers

Willan¹,

Bagnall²,

Mahon³

et al. 1981

Br J Sports Med

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Some basic haematological characteristics of a group of competitive swimmers were compared with haematological “normal standards” and with a “control” group of non-athletes, unmatched for age. In the women, the values for red blood cell count, haemoglobin concentration, and mean red cell volume for both the swimmers and the controls were not significantly different from the normal standards. In the groups of men, both swimmers and controls, red cell counts were significantly lower than the normal standard values, although individual values lay within the “normal range” (mean ± 2 standard deviations). The ranges of the values for individuals were found to be narrow. There were no significant differences between these ranges over periods of five consecutive weeks and five consecutive months. Relatively large changes in results for individuals could occur before the results would be considered abnormal, that is, before the results fall outside the “normal range”. Early detection of changes may perhaps be facilitated if the range of values for individual athletes is determined by monitoring.

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Section: Discussioncontrasting

confidence: 56%

“…Data for specific age groupsthough not used in routine clinical practiceis available: for example, Kasper and Wallerstein (1966) studied adolescents. However, incompatibilities due to analytic or ethnic differences may again deny direct comparison.…”

Section: Discussionmentioning

confidence: 99%

Some haematological characteristics of competitive swimmers

Willan¹,

Bagnall²,

Mahon³

et al. 1981

Br J Sports Med

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“…However, 94.1% of the female sample had already experienced menarche and thus the sample size might not have been sufficient to detect such differences . Other studies that examined Hb concentration and prevalence of anemia in relation to the onset of menarche have had similar limitations . Additional studies with larger sample sizes are needed to evaluate whether the onset of menarche impacts Hb concentration among adolescents.…”

Section: Variation In Average Hb Values Across Life Stages and By Sexmentioning

confidence: 99%

Variation in hemoglobin across the life cycle and between males and females

Jorgensen

Crespo-Bellido

Dewey

2019

Annals of the New York Academy of Sciences

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WHO recommendations for hemoglobin (Hb) cutoffs to define anemia are based on a handful of studies conducted in the 1960s that did not include participants from all life stages. To evaluate whether there is a need to update Hb cutoffs, we conducted a narrative review of the literature to identify more recent studies that have reported Hb cutoffs in males and females in various life stages. We compiled information from 60 studies conducted around the globe between 1975 and 2018. Many studies reported cutoffs that were similar to WHO recommendations, but cutoffs identified in studies of infants, young children, premenopausal women, and the elderly tended to be lower than WHO recommendations, while cutoffs identified in studies of men tended to be higher than WHO cutoffs. Few studies excluded individuals with iron deficiency or inflammation, which limits the conclusions that can be drawn regarding normal reference ranges. Further research using more stringent exclusion criteria is needed to develop revised recommendations for Hb cutoffs to define anemia.

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