Plasma trace elements levels are not altered by submaximal exercise intensities in well-trained endurance euhydrated athletes |
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| Affiliation: | 1. Department of Pharmacology and Physiology, School of Medicine, University of Zaragoza, Spain;2. Toxicology Service, Hospital Central de la Defensa, Madrid, Spain;1. Free Radical Biochemistry Laboratory, School of Biological Sciences, University of Canterbury, New Zealand;2. Department of Rehabilitation Medicine, University of Minnesota, USA;3. Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, New Zealand;4. New Zealand Rugby Union, New Zealand;5. Sports Performance Research Institute New Zealand, School of Sport and Recreation, Auckland University of Technology, New Zealand;6. College of Life and Natural Sciences, University of Derby, United Kingdom;7. Department of Radiology, University of Otago, New Zealand;1. Department of Earth and Marine Science (DiSTeM), University of Palermo, Viale delle Scienze Ed. 16, 90128 - Palermo, Italy;2. Consorzio Nazionale Interuniversitario per le Science del Mare (CoNISMa), Piazzale Flaminio 9, 00196 - Roma, Italy;1. Institute of Physical and Organic Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russian Federation;2. Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russian Federation |
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| Abstract: | The purpose of this study was to assess the effect of relative exercise intensity on various plasma trace elements in euhydrated endurance athletes.Twenty-seven well-trained endurance athletes performed a cycloergometer test: after a warm-up of 10 min at 2.0 W kg−1, workload increased by 0.5 W kg−1 every 10 min until exhaustion. Oxygen uptake, blood lactate concentration ([La−]b), and plasma ions (Zn, Se, Mn and Co) were measured at rest, at the end of each stage, and 3, 5 and 7 min post-exercise. Urine specific gravity (USG) was measured before and after the test, and subjects drank water ad libitum. Fat oxidation (FATOXR), carbohydrate oxidation (CHOOXR), energy expenditure from fat (EEFAT), from carbohydrates (EECHO) and total EE (EET) were estimated using stoichiometric equations. A repeated measure (ANOVA) was used to compare plasma ion levels at each exercise intensity level. The significance level was set at P < 0.05.No significant differences were found in USG between, before, and after the test (1.014 ± 0.004 vs. 1.014 ± 0.004 g cm−3) or in any plasma ion level as a function of intensity. There were weak significant correlations of Zn (r = 0.332, P < 0.001) and Se (r = 0.242, P < 0.01) with [La−]b, but no relationships were established between [La−]b, VO2, FATOXR, CHOOXR, EEFAT, EECHO, or EET and plasma ion levels.Acute exercise at different submaximal intensities in euhydrated well-trained endurance athletes does not provoke a change in plasma trace element levels, suggesting that plasma volume plays an important role in the homeostasis of these elements during exercise. |
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