Abstract
Oxygen dissociation curves (ODC), Bohr coefficients (BC), blood hemoglobin concentration (Hb), and hematocrit (Hct) were measured in 20 normal (N) and 26 marginally undernourished (U) Colombian children 6–16 yrs of age. In a group of 15 N-boys Hct was significantly correlated with age (p<.01), while in a group of 22 U-boys no age correlation for the Hct could be found. On the other hand, the analysis revealed a significant (p<.05) negative age correlation in the lower part of the U-boys' ODC. A comparison between two groups of boys with about equal ages but different nutritional status revealed lower BC's and a left shifted upper part of the ODC for the U-group. Due to the combined effects of a left shifted ODC, lower BC's, and lower Hb, U-boys 10 to 13 yrs of age extract about 10% less oxygen per each dl of blood pumped through their systemic circulation during strenuous exercise than N-boys.
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