Increased Iron Status during a Feeding Trial of Iron-Biofortified Beans Increases Physical Work Efficiency in Rwandan Women.
J Nutr
; 150(5): 1093-1099, 2020 05 01.
Article
en En
| MEDLINE
| ID: mdl-32006009
ABSTRACT
BACKGROUND:
Iron-biofortified staple foods can improve iron status and resolve iron deficiency. However, whether improved iron status from iron biofortification can improve physical performance remains unclear.OBJECTIVE:
This study aimed to examine whether changes in iron status from an iron-biofortified bean intervention affect work efficiency.METHODS:
A total of 125 iron-depleted (ferritin <20 µg/L) female Rwandan university students (18-26 y) were selected from a larger sample randomly assigned to consume iron-biofortified beans (Fe-Bean; 86.1 mg Fe/kg) or conventional beans (control 50.6 mg Fe/kg) twice daily for 18 wk (average of 314 g beans consumed/d). Blood biomarkers of iron status (primary outcome) and physical work efficiency (secondary outcome) were measured before and after the intervention. Work performed was assessed during 5-min steady-state periods at 0-, 25-, and 40-W workloads using a mechanically braked cycle ergometer. Work efficiency was calculated at 25 W and 40 W as the work accomplished divided by the energy expended at that workload above that expended at 0 W. General linear models were used to evaluate the relation between changes in iron status biomarkers and work efficiency.RESULTS:
The Fe-Bean intervention had significant positive effects on hemoglobin, serum ferritin, and body iron stores but did not affect work efficiency. However, 18-wk change in hemoglobin was positively related to work efficiency at 40 W in the full sample (n = 119; estimate 0.24 g/L; 95% CI 0.01, 0.48 g/L; P = 0.044) and among women who were anemic (hemoglobin <120 g/L) at baseline (n = 43; estimate 0.64 g/L; 95% CI 0.05, 1.23 g/L; P = 0.036). Among women who were nonanemic at baseline, change in serum ferritin was positively related to change in work efficiency at 40 W (n = 60; estimate 0.50 µg/L; 95% CI 0.06, 0.95 µg/L; P = 0.027).CONCLUSIONS:
Increasing iron status during an iron-biofortified bean feeding trial improves work efficiency in iron-depleted, sedentary women. This trial was registered at clinicaltrials.gov as NCT01594359.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Anemia Ferropénica
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Biofortificación
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Hierro
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Fabaceae
Límite:
Adult
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Female
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Humans
País/Región como asunto:
Africa
Idioma:
En
Revista:
J Nutr
Año:
2020
Tipo del documento:
Article
País de afiliación:
Estados Unidos