Functional assessment of zinc nutriture using changes in plasma zinc after exercise in men supplemented with folic acid
Recently, the authors proposed that changes in plasma zinc (Zn) and copper (Cu) content after maximal exercise could be a functional test of human trace element nutriture. To test this hypothesis, they studied the effect of folic acid (FA) supplements, previously shown to affect zinc absorption on the exercise-induced changes in plasma Zn and Cu in 7 men aged 28.6 +/- 1.2 yr (mean +/- SEM). The men were fed a constant diet with intakes of Cu (1.01 +/- 0.06 mg/d), Zn (12.7 +/- 0.3 mg/d) and FA (200 mg/d) for two 4 wk periods. This basal diet was supplemented with 400 or 800 mg/d FA and it was fed for 4 wk periods alternating with the unsupplemented diet. Pre and post-exercise hematocrit (Hct), hemoglobin (Hb), and plasma Zn and Cu were not affected by FA supplements. To correct for hemoconcentration during exercise, the van Beaumont quotient was calculated from pre and post-exercise Hct, Hb, and plasma Zn and Cu. When the basal diet was fed, the quotient for Zn was 3.4 +/- 1.4 and 2.3 +/- 1.4%, and it declined (p < 0.05) to -5.93 +/- 1.9% and -7.4 +/- 1.8% with 400 and 800 mg/d supplementation, resp. FA supplementation had no effect on the quotient for plasma Cu. These data suggest that Zn mobilization from stores during exercise is impaired with high intakes of FA.
- Research Organization:
- Grand Forks Human Nutrition Research Center, ND
- OSTI ID:
- 7165983
- Report Number(s):
- CONF-8604222-
- Journal Information:
- Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States), Vol. 45:4; Conference: 70. annual meeting of the Federation of American Society for Experimental Biology, St. Louis, MO, USA, 13 Apr 1986
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of marginal dietary zinc on blood fractions of rats
Association of iron and zinc nutriture
Related Subjects
EXERCISE
BIOLOGICAL EFFECTS
FOLIC ACID
ZINC
METABOLISM
BLOOD PLASMA
COPPER
INTESTINAL ABSORPTION
ABSORPTION
AMINO ACIDS
AROMATICS
AZAARENES
BIOLOGICAL MATERIALS
BLOOD
BODY FLUIDS
CARBOXYLIC ACIDS
DRUGS
ELEMENTS
HEMATINICS
HEMATOLOGIC AGENTS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
MATERIALS
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PTERIDINES
TRANSITION ELEMENTS
UPTAKE
VITAMIN B GROUP
VITAMINS
550500* - Metabolism