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Published in: European Journal of Applied Physiology 11/2018

Open Access 01-11-2018 | Original Article

Changes in iron metabolism during prolonged repeated walking exercise in middle-aged men and women

Authors: Rieneke Terink, D. ten Haaf, C. W. G. Bongers, M. G. J. Balvers, R. F. Witkamp, M. Mensink, T. M. H. Eijsvogels, J. M. T. Klein Gunnewiek, M. T. E. Hopman

Published in: European Journal of Applied Physiology | Issue 11/2018

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Abstract

Purpose

The aim of the present study was to assess the effect of prolonged and repeated exercise on iron metabolism in middle-aged adults and to compare differences between sexes.

Methods

50 male (58.9 ± 9.9 year) and 48 female (50.9 ± 11.2 year) individuals were monitored on 4 consecutive days at which they walked on average 8 h and 44 min per day at a self-determined pace. Blood samples were collected 1 or 2 days prior to the start of the exercise (baseline) and every day immediately post-exercise. Samples were analysed for iron, ferritin, haemoglobin, and haptoglobin concentrations.

Results

Plasma iron decreased across days, while ferritin increased across days (both p < 0.001). Haptoglobin showed a decrease (p < 0.001) after the first day and increased over subsequent days (p < 0.001). Haemoglobin did not change after the first day, but increased during subsequent days (p < 0.05). At baseline, 8% of the participants had iron concentrations below minimum reference value (10 µmol/L), this increased to 43% at day 4. There was an interaction between sex and exercise days on iron (p = 0.028), ferritin (p < 0.001) and haemoglobin levels (p = 0.004), but not on haptoglobin levels.

Conclusion

This study showed decreases in iron, increases in ferritin, a decrease followed by increases in haptoglobin and no change followed by increases in haemoglobin. This is most likely explained by (foot strike) haemolysis, inflammation, and sweat and urine losses. These processes resulted in iron levels below minimum reference value in a large number of our participants.
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Metadata
Title
Changes in iron metabolism during prolonged repeated walking exercise in middle-aged men and women
Authors
Rieneke Terink
D. ten Haaf
C. W. G. Bongers
M. G. J. Balvers
R. F. Witkamp
M. Mensink
T. M. H. Eijsvogels
J. M. T. Klein Gunnewiek
M. T. E. Hopman
Publication date
01-11-2018
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Applied Physiology / Issue 11/2018
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-018-3961-5

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