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Mohabbat M, Barati AH, Azarkeivan A, Eghbali E, Arazi H. Acute and Chronic Effects of Interval Aerobic Exercise on Hepcidin, Ferritin, and Liver Enzymes in Adolescents With Beta-Thalassemia Major. Pediatr Exerc Sci 2024:1-9. [PMID: 39265980 DOI: 10.1123/pes.2023-0197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 05/26/2024] [Accepted: 06/19/2024] [Indexed: 09/14/2024]
Abstract
PURPOSE This study aimed to determine the acute and chronic effects of interval aerobic exercise on hepcidin, ferritin, and liver enzymes in adolescents with beta-thalassemia major. METHODS Twenty-six beta-thalassemia major adolescents referred to the Thalassemia Clinic and Research Center were selected as study participants and randomly divided into control (n = 13) and training (n = 13) groups. Participants performed 3 sessions per week for 45 minutes in each session for 8 weeks of aerobic interval exercise with an intensity of 50% to 65% of the heart rate reserve. Blood samples were taken before, immediately after the exercise session, and 48 hours after the last training session, and liver enzymes aspartate aminotransferase, alanine aminotransferase (ALT), alkaline phosphatase (ALP), ferritin, and hepcidin were evaluated. RESULTS The results showed a decrease in aspartate aminotransferase, ALT, ALP, ferritin, and hepcidin levels due to 8 weeks of aerobic interval training (P = .14, P = .97, P = .03, P < .001, P < .001; respectively). Intergroup changes in all variables except ALT and hepcidin were significant (P < .05). Besides, acute aerobic exercise increased levels of aspartate aminotransferase, ALT, ferritin, and hepcidin (P = .04, P = .52, P < .001, P < .001; respectively), whereas ALP levels decreased (P < .001). In addition, changes in ALP and hepcidin levels were significant between the 2 groups (P = .05, P < .001; respectively). CONCLUSION Based on the study's results, it can be concluded that 8 weeks of aerobic interval training can decrease ferritin and hepcidin levels, but acute aerobic exercise increases them.
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Affiliation(s)
- Majid Mohabbat
- Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, Rasht,Iran
| | - Amir Hossein Barati
- Department of Health and Exercise Rehabilitation, Shahid Beheshti University, Tehran,Iran
| | - Azita Azarkeivan
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran,Iran
| | - Ehsan Eghbali
- Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, Rasht,Iran
| | - Hamid Arazi
- Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, Rasht,Iran
- Department of Exercise Physiology, Faculty of Sport Sciences, Ferdowsi University of Mashhad, Mashhad,Iran
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2
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Bollinger L, Bartel A, Weber C, Gehlen H. Pre-Ride Biomarkers and Endurance Horse Welfare: Analyzing the Impact of the Elimination of Superoxide Dismutase, δ-Aminolevulinic-Dehydratase, Thiobarbituric Acid Reactive Substances, Iron, and Serum Amyloid A Levels in Elite 160 km Endurance Rides. Animals (Basel) 2023; 13:ani13101670. [PMID: 37238102 DOI: 10.3390/ani13101670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/18/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
High elimination rates and concerns for horse welfare are important issues in endurance riding. Improved understanding of the causes of elimination could increase completion rates in this sport. We have identified pre-ride laboratory risk factors that enable an assessment of potential elimination before the ride. A longitudinal cohort study was performed among 49 healthy horses competing in the 160 km endurance ride at the 2016 World Championship of Endurance Riding in Samorin/Slovakia. Blood samples were taken before the event. For statistical evaluation, horses were categorized into three groups: finishers, lame horses, and metabolically eliminated horses. Risk factors were calculated for each group using multinominal logistic regression. δ-Aminolevulinic-dehydratase (ALAD), thiobarbituric acid reactive substances (TBARSs), iron, and serum amyloid A (SAA) were measured and did not show an impact on the race outcome, but elevated pre-ride superoxide dismutase (SOD) was shown to have an effect on lameness elimination (p = 0.011). It might serve as an indicator for withdrawing horses at risk of later elimination before endurance rides, ultimately resulting in lower elimination rates and an increase in overall horse welfare.
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Affiliation(s)
- Lena Bollinger
- Equine Clinic, Internal Medicine, Freie Universität Berlin, Oertzenweg 19b, 14193 Berlin, Germany
| | - Alexander Bartel
- Institute for Veterinary Epidemiology and Biostatistics, Freie Universität Berlin, Königsweg 67, 14163 Berlin, Germany
| | - Corinna Weber
- Laboklin Veterinary Laboratory Diagnostics, Steubenstrasse 4, 97688 Bad Kissingen, Germany
| | - Heidrun Gehlen
- Equine Clinic, Internal Medicine, Freie Universität Berlin, Oertzenweg 19b, 14193 Berlin, Germany
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Roy R, Kück M, Radziwolek L, Kerling A. Iron Deficiency in Adolescent and Young Adult German Athletes-A Retrospective Study. Nutrients 2022; 14:nu14214511. [PMID: 36364775 PMCID: PMC9657900 DOI: 10.3390/nu14214511] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/19/2022] [Accepted: 10/20/2022] [Indexed: 11/30/2022] Open
Abstract
Background: Iron deficiency is a common phenomenon in sports and may lead to impaired physical performance. The aim of the study was to determine the frequency of iron deficiency in competitive athletes and to discuss the resulting consequences. Methods: The data of 629 athletes (339 male, 290 female) who presented for their annual basic sports medicine examination were investigated. Depending on age (<14 years, 15−17 years, ≥18−30 years), four groups ((I.) normal hemoglobin (Hb) and ferritin level (≥30 ng/mL for adults and 15−18-year-olds; ≥20 ng/mL, respectively, ≥15 ng/mL for adolescents and children), (II.) prelatent iron deficiency (ID) (normal Hb, low ferritin), (III.) latent ID (additionally elevated soluble transferrin receptor or decreased transferrin saturation) and (IV.) manifest anemia) were distinguished. In addition, the iron status and exercise capacity of different types of sports were compared. Results: Overall we found an iron deficiency of 10.9% in male (mainly in adolescence) and 35.9% in female athletes (emphasized in adolescence and young adulthood). There were no significant differences in iron status in regard to the different sport types or in maximum performance for the different groups of iron deficiency. Conclusions: Adolescent and female athletes are more likely to have an iron deficiency. Therapy concepts for athletes therefore should pay attention to iron-rich diets.
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Affiliation(s)
- Rubina Roy
- Department for Rehabilitation and Sports Medicine, Hannover Medical School, 30559 Hannover, Germany
- Bundeswehr Medical Service Headquarters, 56070 Koblenz, Germany
| | - Momme Kück
- Department for Rehabilitation and Sports Medicine, Hannover Medical School, 30559 Hannover, Germany
| | - Lukas Radziwolek
- Department for Rehabilitation and Sports Medicine, Hannover Medical School, 30559 Hannover, Germany
| | - Arno Kerling
- Department for Rehabilitation and Sports Medicine, Hannover Medical School, 30559 Hannover, Germany
- Correspondence: ; Tel.: +49-511-532-5499; Fax: +49-511-532-8199
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Kahraman C, Turgay F, Yigittürk O, Canüzmez AE, Durmaz B, Aşikovali S. Does the TMPRSS6 C > T Polymorphism Modify the Endurance Training Effects on Hematological Parameters? Biol Trace Elem Res 2022; 200:2588-2596. [PMID: 34398419 DOI: 10.1007/s12011-021-02876-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 08/07/2021] [Indexed: 11/27/2022]
Abstract
This study investigated the role of TMPRSS6 C > T polymorphism (TMPRP) on the effects of chronic aerobic training on main hematological parameters in male soccer referees, which is yet unknown. Two groups composed of total of 45 healthy male soccer referees and 42 sedentary were compared for hemogram, serum hepcidin, ferritin, and iron levels. TMPRP was determined from genomic DNA samples. Participants' physical and physiological (Yoyo endurance level-2 test) measurements were carried out. The athletic T carrier (Tc = TT + TC) group RBC count was significantly higher than the control (p < 0.01), whereas the athletic CC homozygous group serum iron and transferrin saturation (TS) were lower than the control depending on the TMPRP. The ferritin and iron values of the athletic Tc group were higher than of the athletic CC group (29.2% and 14.1%, respectively; p > 0.05) although the control Tc group RBC (p < 0.05) and iron (23.8%, p > 0.05) values were lower than the control CC due to genetic tendency. The training did not change hepcidin levels. These results suggest that the TMPRP can modify the endurance training effects on iron and TS levels and RBC count (in the CC and Tc groups) respectively. The CC group may be adversely affected for iron and TS from endurance trainings. It may be recommended that the training programs should be organized according to phenotype characteristics.
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Affiliation(s)
- Cansu Kahraman
- Department of Sport Health Sciences, Institute of Health Sciences, Ege University, Izmir, Turkey
| | - Faruk Turgay
- Coaching Education Department, Faculty of Sport Sciences, Ege University, Izmir, Turkey
| | - Oya Yigittürk
- Department of Sport Health Sciences, Institute of Health Sciences, Ege University, Izmir, Turkey.
| | - Aykut Eren Canüzmez
- Coaching Education Department, Faculty of Sport Sciences, Ege University, Izmir, Turkey
| | - Burak Durmaz
- Medical Genetics Department, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Semih Aşikovali
- Department of Medical Genetics, Faculty of Medicine, Hatay Mustafa Kemal University, Hatay, Turkey
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Cancer Related Anemia: An Integrated Multitarget Approach and Lifestyle Interventions. Nutrients 2021; 13:nu13020482. [PMID: 33535496 PMCID: PMC7912724 DOI: 10.3390/nu13020482] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/26/2021] [Accepted: 01/28/2021] [Indexed: 12/16/2022] Open
Abstract
Cancer is often accompanied by worsening of the patient's iron profile, and the resulting anemia could be a factor that negatively impacts antineoplastic treatment efficacy and patient survival. The first line of therapy is usually based on oral or intravenous iron supplementation; however, many patients remain anemic and do not respond. The key might lie in the pathogenesis of the anemia itself. Cancer-related anemia (CRA) is characterized by a decreased circulating serum iron concentration and transferrin saturation despite ample iron stores, pointing to a more complex problem related to iron homeostatic regulation and additional factors such as chronic inflammatory status. This review explores our current understanding of iron homeostasis in cancer, shedding light on the modulatory role of hepcidin in intestinal iron absorption, iron recycling, mobilization from liver deposits, and inducible regulators by infections and inflammation. The underlying relationship between CRA and systemic low-grade inflammation will be discussed, and an integrated multitarget approach based on nutrition and exercise to improve iron utilization by reducing low-grade inflammation, modulating the immune response, and supporting antioxidant mechanisms will also be proposed. Indeed, a Mediterranean-based diet, nutritional supplements and exercise are suggested as potential individualized strategies and as a complementary approach to conventional CRA therapy.
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Man Y, Xu T, Adhikari B, Zhou C, Wang Y, Wang B. Iron supplementation and iron-fortified foods: a review. Crit Rev Food Sci Nutr 2021; 62:4504-4525. [PMID: 33506686 DOI: 10.1080/10408398.2021.1876623] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
About one-third of the world population is suffering from iron deficiency. Delivery of iron through diet is a practical, economical, and sustainable approach. Clinical studies have shown that the consumption of iron-fortified foods is one of the most effective methods for the prevention of iron deficiency. However, supplementing iron through diet can cause undesirable side-effects. Thus, it is essential to develop new iron-rich ingredients, iron-fortified products with high bioavailability, better stability, and lower cost. It is also essential to develop newer processing technologies for more effective fortification. This review compared the iron supplementation strategies used to treat the highly iron-deficient population and the general public. We also reviewed the efficacy of functional (iron-rich) ingredients that can be incorporated into food materials to produce iron-fortified foods. The most commonly available foods, such as cereals, bakery products, dairy products, beverages, and condiments are still the best vehicles for iron fortification and delivery.Scope of reviewThe manuscript aims at providing a comprehensive review of the latest publications that cover three aspects: administration routes for iron supplementation, iron-rich ingredients used for iron supplementation, and iron-fortified foods.
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Affiliation(s)
- Yaxing Man
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, PR China
| | - Tiantian Xu
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, PR China
| | - Benu Adhikari
- School of Science, RMIT University, Melbourne, Australia
| | - Cunshan Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, PR China
| | - Yuchuan Wang
- School of Food Engineering, Jiangnan University, Wuxi, PR China
| | - Bo Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, PR China
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Gkouskou KK, Grammatikopoulou MG, Vlastos I, Sanoudou D, Eliopoulos AG. Genotype-guided dietary supplementation in precision nutrition. Nutr Rev 2020; 79:1225-1235. [PMID: 33367884 DOI: 10.1093/nutrit/nuaa132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Achieving adequate micronutrient status, while avoiding deficiencies, represents a challenge for people globally. Consequently, many individuals resort to oral nutrient supplementation (ONS) in order to correct suboptimal dietary intakes. Advances in the fields of nutrigenetics and nutritional genomics have identified differences in response to micronutrient supplementation according to genetic makeup, adding dietary supplement use to the clinician's toolkit in the precision nutrition era. This review focuses on published evidence linking genetic variants to the responses associated with some of the most popular dietary supplements. With an increasing number of health professionals becoming involved in the prescription of ONS, identifying and matching individuals to the appropriate dietary supplement according to their genotype is important for achieving optimal health benefits and micronutrient equilibrium, while reducing the adverse events and financial costs often associated with excessive ONS.
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Affiliation(s)
- Kalliopi K Gkouskou
- Department of Biology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Embiodiagnostics, Biology Research Company, Heraklion, Crete, Greece
| | - Maria G Grammatikopoulou
- Department of Nutritional Sciences and Dietetics, Faculty of Health Sciences, International Hellenic University, Thessaloniki, Greece
| | - Ioannis Vlastos
- Department of Biology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Despina Sanoudou
- Clinical Genomics and Pharmacogenomics Unit, 4th Department of Internal Medicine, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Center for New Biotechnologies and Precision Medicine, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Center of Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Aristides G Eliopoulos
- Department of Biology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Center for New Biotechnologies and Precision Medicine, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.,Center of Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
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8
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The Effect of One Bout of Intensive Judo Exercise on Select Hematological and Immunological Parameters in Adolescent Elite Judo Athletes. Asian J Sports Med 2020. [DOI: 10.5812/asjsm.101364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: Exercise-related studies do not agree on changes in blood parameters regarding anemia and serum immunoglobulin concentration as adaptive immunity. Objectives: The current study aimed to investigate exercise-induced variations in hematological and immunological parameters in response to one bout of intensive judo exercise in adolescent elite judoka. Methods: Venipuncture was performed on ten adolescent male Iranian elite judoka (age: 15.60 ± 0.69 years; body mass index: 24.15 ± 2.80 kg/m2) before and immediately after one bout of intensive judo protocol. Erythrocyte variables [red blood cell count (RBC), hemoglobin (HGB), hematocrit (HCT), mean corpuscular volume (MCV), red distribution width (RDW), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC)], platelets variables [platelet count (PLT), platelet distribution width (PDW), mean platelet volume (MPV), plateletcrit (PCT)], cellular immune variables [white blood cell (WBC), neutrophil (NEU), lymphocyte (LYM)], and humoral immune variables (IgM, IgA, IgG, IgE) were measured. Data were analyzed using Wilcoxon and paired-samples t-test, and P < 0.05 was considered significant. Results: After the plasma volume was corrected using the Dill and Costill equation, the results showed that RBC, HGB, HCT, MCHC, IgA, and IgM decreased significantly immediately after exercise. However, MCH, RDW, PLT, PDW, MPV, PCT, WBC, LYM, NEU, IgG, and IgE did not change significantly. Conclusions: According to the findings, it can be concluded that intensive judo exercise results in transient anemia and suppression of humoral immune response among adolescent elite judoka.
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9
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Varillas Delgado D, Tellería Orriols JJ, Monge Martín D, Del Coso J. Genotype scores in energy and iron-metabolising genes are higher in elite endurance athletes than in nonathlete controls. Appl Physiol Nutr Metab 2020; 45:1225-1231. [PMID: 32379996 DOI: 10.1139/apnm-2020-0174] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Information about the association of energy and iron-metabolising genes with endurance performance is scarce. The objective of this investigation was to compare the frequencies of polymorphic variations of genes involved in energy generation and iron metabolism in elite endurance athletes versus nonathlete controls. Genotype frequencies in 123 male elite endurance athletes (75 professional road cyclists and 48 elite endurance runners) and 122 male nonathlete participants were compared by assessing 4 genetic polymorphisms: AMPD1 c.34C/T (rs17602729), PPARGC1A c.1444G/A (rs8192678) HFEH63D c.187C/G (rs1799945) and HFEC282Y c.845G/A (rs1800562). A weighted genotype score (w-TGS; from 0 to 100 arbitrary units (a.u.)) was calculated by assigning a corresponding weight to each polymorphism. In the nonathlete population, the mean w-TGS value was lower (39.962 ± 14.654 a.u.) than in the group of elite endurance athletes (53.344 ± 17.053 a.u). The binary logistic regression analysis showed that participants with a w-TGS > 38.975 a.u had an odds ratio of 1.481 (95% confidence interval: 1.244-1.762; p < 0.001) for achieving elite athlete status. The genotypic distribution of polymorphic variations involved in energy generation and iron metabolism was different in elite endurance athletes vs. controls. Thus, an optimal genetic profile in these genes might contribute to physical endurance in athlete status. Novelty Genetic profile in energy generation and iron-metabolising genes in elite endurance athletes is different than that of nonathletes. There is an implication of an "optimal" genetic profile in the selected genes favouring endurance sporting performance.
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Affiliation(s)
- David Varillas Delgado
- Universidad Francisco de Vitoria, Faculty of Medicine, Research Unit, Pozuelo de Alarcón, Madrid 28223, Spain
| | | | - Diana Monge Martín
- Universidad Francisco de Vitoria, Faculty of Medicine, Pozuelo de Alarcón, Madrid 28223, Spain
| | - Juan Del Coso
- Rey Juan Carlos University, Centre for Sport Studies, Fuenlabrada, Madrid 28933, Spain
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Goto K, Mamiya A, Ito H, Maruyama T, Hayashi N, Badenhorst CE. Partial sleep deprivation after an acute exercise session does not augment hepcidin levels the following day. Physiol Rep 2020; 8:e14450. [PMID: 32458557 PMCID: PMC7250735 DOI: 10.14814/phy2.14450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/23/2020] [Accepted: 04/25/2020] [Indexed: 11/24/2022] Open
Abstract
The purpose of the present study was to determine the effects of partial sleep deprivation (PSD) after an exercise session in the evening on the endurance exercise-induced hepcidin response the following morning. Ten recreationally trained males participated under two different conditions. Each condition consisted of 2 consecutive days of training (days 1 and 2). On day 1, participants ran for 60 min at 75% of maximal oxygen uptake ( V ˙ O2max ) followed by 100 drop jumps. Sleep duration at night was manipulated, with a normal length of sleep (CON condition, 23:00-07:00 hr) or a shortened length of sleep (PSD condition). On the morning of day 2, the participants ran for 60 min at 65% of V ˙ O2max . Sleep duration was significantly shorter under the PSD condition (141.2 ± 13.3 min) than under the CON condition (469.0 ± 2.3 min, p < .0001). Serum hepcidin, plasma interleukin (IL)-6, serum haptoglobin, iron, and myoglobin levels did not differ significantly between the conditions (p > .05) on the morning (before exercise) of day 2. Additionally, the 3-hr postexercise levels for the hematological variables were not significantly different between the two conditions (p > .05). In conclusion, the present study demonstrated that a single night of PSD after an exercise session in the evening did not affect baseline serum hepcidin level the following morning. Moreover, a 60 min run the following morning increased serum hepcidin and plasma IL-6 levels significantly, but the exercise-induced elevations were not affected by PSD.
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Affiliation(s)
- Kazushige Goto
- Graduate School of Sport and Health ScienceRitsumeikan UniversityShigaJapan
| | - Aoi Mamiya
- Graduate School of Sport and Health ScienceRitsumeikan UniversityShigaJapan
| | - Hiroto Ito
- Graduate School of Sport and Health ScienceRitsumeikan UniversityShigaJapan
| | - Tatsuhiro Maruyama
- Graduate School of Sport and Health ScienceRitsumeikan UniversityShigaJapan
| | - Nanako Hayashi
- Graduate School of Sport and Health ScienceRitsumeikan UniversityShigaJapan
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Koehler K, Marks‐Nelson E, Braga CP, Beckford S, Adamec J. Validity of plasma collection cards for ferritin assessment—A proof‐of‐concept study. Eur J Haematol 2020; 104:554-561. [DOI: 10.1111/ejh.13397] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 01/01/2023]
Affiliation(s)
- Karsten Koehler
- Department of Nutrition and Health Sciences University of Nebraska‐Lincoln Lincoln Nebraska
- Department of Sport and Health Sciences Technical University of Munich Munich Germany
| | - Eileen Marks‐Nelson
- Department of Nutrition and Health Sciences University of Nebraska‐Lincoln Lincoln Nebraska
| | - Camila P. Braga
- Department of Biochemistry University of Nebraska‐Lincoln Lincoln Nebraska
| | - Safiya Beckford
- Department of Nutrition and Health Sciences University of Nebraska‐Lincoln Lincoln Nebraska
| | - Jiri Adamec
- Department of Biochemistry University of Nebraska‐Lincoln Lincoln Nebraska
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12
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Goto K, Kojima C, Kasai N, Sumi D, Hayashi N, Hwang H. Resistance exercise causes greater serum hepcidin elevation than endurance (cycling) exercise. PLoS One 2020; 15:e0228766. [PMID: 32106271 PMCID: PMC7046260 DOI: 10.1371/journal.pone.0228766] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 01/23/2020] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Hepcidin is an iron regulating hormone, and exercise-induced hepcidin elevation is suggested to increase the risk of iron deficiency among athletes. OBJECTIVE We compared serum hepcidin responses to resistance exercise and endurance (cycling) exercise. METHODS Ten males [mean ± standard error: 172 ± 2 cm, body weight: 70 ± 2 kg] performed three trials: a resistance exercise trial (RE), an endurance exercise trial (END), and a rest trial (REST). The RE consisted of 60 min of resistance exercise (3-5 sets × 12 repetitions, 8 exercises) at 65% of one repetition maximum, while 60 min of cycling exercise at 65% of [Formula: see text] was performed in the END. Blood samples were collected before exercise and during a 6-h post-exercise (0h, 1h, 2h, 3h, 6h after exercise). RESULTS Both RE and END significantly increased blood lactate levels, with significantly higher in the RE (P < 0.001). Serum iron levels were significantly elevated immediately after exercise (P < 0.001), with no significant difference between RE and END. Both the RE and END significantly increased serum growth hormone (GH), cortisol, and myoglobin levels (P < 0.01). However, exercise-induced elevations of GH and cortisol were significantly greater in the RE (trial × time: P < 0.001). Plasma interleukin-6 (IL-6) levels were significantly elevated after exercise (P = 0.003), with no significant difference between the trials. Plasma hepcidin levels were elevated after exercise (P < 0.001), with significantly greater in the RE (463 ± 125%) than in the END (137 ± 27%, P = 0.03). During the REST, serum hepcidin and plasma IL-6 levels did not change significantly. CONCLUSION Resistance exercise caused a greater exercise-induced elevation in hepcidin than did endurance (cycling) exercise. The present findings indicate that caution will be required to avoid iron deficiency even among athletes in strength (power) types of events who are regularly involved in resistance exercise.
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Affiliation(s)
- Kazushige Goto
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
- * E-mail:
| | | | | | - Daichi Sumi
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Nanako Hayashi
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Hyejung Hwang
- Physical Activity and Performance Institute, Konkuk University, Seoul, Republic of Korea
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Okazaki K, Stray-Gundersen J, Chapman RF, Levine BD. Iron insufficiency diminishes the erythropoietic response to moderate altitude exposure. J Appl Physiol (1985) 2019; 127:1569-1578. [DOI: 10.1152/japplphysiol.00115.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The effects of iron stores and supplementation on erythropoietic responses to moderate altitude in endurance athletes were examined. In a retrospective study, red cell compartment volume (RCV) responses to 4 wk at 2,500 m were assessed in athletes with low ( n = 9, ≤20 and ≤30 ng/mL for women and men, respectively) and normal ( n = 10) serum ferritin levels ([Ferritin]) without iron supplementation. In a subsequent prospective study, the same responses were assessed in athletes ( n = 26) with a protocol designed to provide sufficient iron before and during identical altitude exposure. The responses to a 4-wk training camp at sea level were assessed in another group of athletes ( n = 13) as controls. RCV and maximal oxygen uptake (V̇o2max) were determined at sea level before and after intervention. In the retrospective study, athletes with low [Ferritin] did not increase RCV (27.0 ± 2.9 to 27.5 ± 3.8 mL/kg, mean ± SD, P = 0.65) or V̇o2max (60.2 ± 7.2 to 62.2 ± 7.5 mL·kg−1·min−1, P = 0.23) after 4 wk at altitude, whereas athletes with normal [Ferritin] increased both (RCV: 27.3 ± 3.1 to 29.8 ± 2.4 mL/kg, P = 0.002; V̇o2max: 62.0 ± 3.1 to 66.2 ± 3.7 mL·kg−1·min−1, P = 0.003). In the prospective study, iron supplementation normalized low [Ferritin] observed in athletes exposed to altitude ( n = 14) and sea level ( n = 6) before the altitude/sea-level camp and maintained [Ferritin] within normal range in all athletes during the camp. RCV and V̇o2max increased in the altitude group but remained unchanged in the sea-level group. Finally, the increase in RCV correlated with the increase in V̇o2max [( r = 0.368, 95% confidence interval (CI): 0.059–0.612, P = 0.022]. Thus, iron deficiency in athletes restrains erythropoiesis to altitude exposure and may preclude improvement in sea-level athletic performance. NEW & NOTEWORTHY Hypoxic exposure increases iron requirements and utilization for erythropoiesis in athletes. This study clearly demonstrates that iron deficiency in athletes inhibits accelerated erythropoiesis to a sojourn to moderate high altitude and may preclude a potential improvement in sea-level athletic performance with altitude training. Iron replacement therapy before and during altitude exposure is important to maximize performance gains after altitude training in endurance athletes.
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Affiliation(s)
- Kazunobu Okazaki
- Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas
| | | | | | - Benjamin D. Levine
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas
- University of Texas Southwestern Medical Center at Dallas, Dallas, Texas
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Skalny AV, Zaitseva IP, Gluhcheva YG, Skalny AA, Achkasov EE, Skalnaya MG, Tinkov AA. Cobalt in athletes: hypoxia and doping - new crossroads. J Appl Biomed 2019; 17:28. [DOI: 10.32725/jab.2018.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 10/15/2018] [Indexed: 12/12/2022] Open
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15
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Moretti D, Mettler S, Zeder C, Lundby C, Geurts-Moetspot A, Monnard A, Swinkels DW, Brittenham GM, Zimmermann MB. An intensified training schedule in recreational male runners is associated with increases in erythropoiesis and inflammation and a net reduction in plasma hepcidin. Am J Clin Nutr 2018; 108:1324-1333. [PMID: 30351387 DOI: 10.1093/ajcn/nqy247] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 08/21/2018] [Indexed: 01/24/2023] Open
Abstract
Background Iron status is a determinant of physical performance, but training may induce both low-grade inflammation and erythropoiesis, exerting opposing influences on hepcidin and iron metabolism. To our knowledge, the combined effects on iron absorption and utilization during training have not been examined directly in humans. Objective We hypothesized that 3 wk of exercise training in recreational male runners would decrease oral iron bioavailability by increasing inflammation and hepcidin concentrations. Design In a prospective intervention, nonanemic, iron-sufficient men (n = 10) completed a 34-d study consisting of a 16-d control phase and a 22-d exercise-training phase of 8 km running every second day. We measured oral iron absorption and erythroid iron utilization using oral 57Fe and intravenous 58Fe tracers administered before and during training. We measured hemoglobin mass (mHb) and total red blood cell volume (RCV) by carbon monoxide rebreathing. Iron status, interleukin-6 (IL-6), plasma hepcidin (PHep), erythropoietin (EPO), and erythroferrone were measured before, during, and after training. Results Exercise training induced inflammation, as indicated by an increased mean ± SD IL-6 (0.87 ± 1.1 to 5.17 ± 2.2 pg/mL; P < 0.01), while also enhancing erythropoiesis, as indicated by an increase in mean EPO (0.66 ± 0.42 to 2.06 ± 1.6 IU/L), mHb (10.5 ± 1.6 to 10.8 ± 1.8 g/kg body weight), and mean RCV (30.7 ± 4.3 to 32.7 ± 4.6 mL/kg) (all P < 0.05). Training tended to increase geometric mean iron absorption by 24% (P = 0.083), consistent with a decreased mean ± SD PHep (7.25 ± 2.14 to 5.17 ± 2.24 nM; P < 0.05). The increase in mHb and erythroid iron utilization were associated with the decrease in PHep (P < 0.05). Compartmental modeling indicated that iron for the increase in mHb was obtained predominantly (>80%) from stores mobilization rather than from increased dietary absorption. Conclusions In iron-sufficient men, mild intensification of exercise intensity increases both inflammation and erythropoiesis. The net effect is to decrease hepcidin concentrations and to tend to increase oral iron absorption. This trial was registered at clinicaltrials.gov as NCT01730521.
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Affiliation(s)
- Diego Moretti
- Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology, ETH Zürich, Zurich, Switzerland
| | - Samuel Mettler
- Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology, ETH Zürich, Zurich, Switzerland.,Swiss Federal Institute of Sports, Magglingen, Switzerland.,Department of Business, Health, and Social Work, Bern University of Applied Sciences, Bern, Switzerland
| | - Christophe Zeder
- Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology, ETH Zürich, Zurich, Switzerland
| | - Carsten Lundby
- Zurich Center for Integrative Human Physiology, Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Anneke Geurts-Moetspot
- Hepcidinanalysis.com and Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud University Medical Center, Nijmegen, Netherlands
| | - Arnaud Monnard
- Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology, ETH Zürich, Zurich, Switzerland
| | - Dorine W Swinkels
- Hepcidinanalysis.com and Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud University Medical Center, Nijmegen, Netherlands
| | - Gary M Brittenham
- Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology, ETH Zürich, Zurich, Switzerland
| | - Michael B Zimmermann
- Laboratory of Human Nutrition, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology, ETH Zürich, Zurich, Switzerland
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16
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Burtscher M, Niedermeier M, Burtscher J, Pesta D, Suchy J, Strasser B. Preparation for Endurance Competitions at Altitude: Physiological, Psychological, Dietary and Coaching Aspects. A Narrative Review. Front Physiol 2018; 9:1504. [PMID: 30425646 PMCID: PMC6218926 DOI: 10.3389/fphys.2018.01504] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 10/05/2018] [Indexed: 01/14/2023] Open
Abstract
It was the Summer Olympic Games 1968 held in Mexico City (2,300 m) that required scientists and coaches to cope with the expected decline of performance in endurance athletes and to establish optimal preparation programs for competing at altitude. From that period until now many different recommendations for altitude acclimatization in advance of an altitude competition were proposed, ranging from several hours to several weeks. Those recommendations are mostly based on the separate consideration of the physiology of acclimatization, psychological issues, performance changes, logistical or individual aspects, but there is no review considering all these aspects in their entirety. Therefore, the present work primarily focusses on the period of altitude sojourn prior to the competition at altitude based on physiological and psychological aspects complemented by nutritional and sports practical considerations.
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Affiliation(s)
- Martin Burtscher
- Department of Sport Science, University of Innsbruck, Innsbruck, Austria.,Austrian Society for Alpine and Mountain Medicine, Innsbruck, Austria
| | - Martin Niedermeier
- Department of Sport Science, University of Innsbruck, Innsbruck, Austria
| | - Johannes Burtscher
- Laboratory of Molecular and Chemical Biology of Neurodegeneration, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Dominik Pesta
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Institute for Diabetes Research at Heinrich Heine University, Düsseldorf, Germany.,German Center for Diabetes Research, München-Neuherberg, Germany
| | - Jiri Suchy
- Faculty of Physical Education and Sport, Charles University, Prague, Czechia
| | - Barbara Strasser
- Department of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany.,Medical School, Sigmund Freud University, Vienna, Austria
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Sung JY, Park S, Lim SG, Lee SK, Kang DM, Lee M, Kim HJ. Effect of Spatone Supplement on Endurance Capacity and Inflammatory Cytokines in a Rapid Weight Control Program in University Wrestlers: A Pilot Study. J Med Food 2018; 21:832-839. [PMID: 29957136 DOI: 10.1089/jmf.2017.4085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In this pilot study, we investigated the effect of spatone, a naturally occurring mineral water supplement, on endurance capacity and inflammatory cytokines in wrestlers undergoing a rapid weight control program. Nine amateur university wrestlers participated and were randomly divided into placebo- and spatone-treated groups. The study used a crossover design, including a 4-week washout period. The rapid weight control program was focused on body weight loss, while maintaining their athletic performance (muscular strength and cardiovascular endurance). The initial body weight was 87.19 ± 2.45 kg in the spatone-treated group and 86.60 ± 3.01 kg in the placebo group. After the rapid weight control program, the body weight decreased to 83.56 ± 2.71 kg (4.21% decrease) in the spatone-treated group and 82.95 ± 2.97 kg (4.16% decrease) in the placebo group. However, there were no significant differences in body weight or body composition between placebo- and spatone-treated groups. Endurance capacity improved significantly in terms of VO2max and lactate accumulation after spatone supplement. The interleukin (IL)-10, tumor necrosis factor (TNF)-alpha, and IL-6 concentrations were not altered with spatone treatment or placebo in the rapid weight-loss condition; however, a positive relationship (R = 0.643, P = .023) was observed between the change in IL-6 and VO2max. Thus, our results are consistent with prior studies in that spatone supplementation could protect against iron loss induced by intense training, considering that spatone affects the modulation of inflammatory cytokines and exercise capacity. These preliminary results serve to facilitate the planning for the nutritional application of spatone with their exercise program for wrestlers.
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Affiliation(s)
- Jun-Young Sung
- 1 Department of Physical Education, College of Physical Education, Yongin University , Yongin, Korea
| | - Sok Park
- 2 Department of Sports & Leisure Studies, Kwangwoon University , Seoul, Korea
| | - Soon-Gill Lim
- 1 Department of Physical Education, College of Physical Education, Yongin University , Yongin, Korea
| | - Sun-Kyung Lee
- 3 Department of Physical Education, Sookmyung Women's University , Seoul, Korea
| | - Deuk-Mo Kang
- 4 Department of Physical Education, Sejong University , Seoul, Korea
| | - Minki Lee
- 5 Department of Physical Education, Kongju National University , Kongju, Korea
| | - Hee-Jae Kim
- 6 Institute of Sports Science, Seoul National University , Seoul, Korea
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18
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AlRuthia Y, Balkhi B, Alrasheed M, Altuwaijri A, Alarifi M, Alzahrani H, Mansy W. Use of dietary and performance-enhancing supplements among male fitness center members in Riyadh: A cross-sectional study. PLoS One 2018; 13:e0199289. [PMID: 29928034 PMCID: PMC6013215 DOI: 10.1371/journal.pone.0199289] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 06/05/2018] [Indexed: 11/19/2022] Open
Abstract
This study aimed to explore the health beliefs and patterns of dietary supplement usage among fitness center members. This cross-sectional study was conducted in four large indoor fitness centers in Riyadh, Saudi Arabia. This study involved male fitness center members aged ≥18 years with no speech or hearing disabilities. In-person interviews were conducted with fitness center members who agreed to participate using a newly developed questionnaire. Information on participants’ sociodemographics (e.g., age and education), smoking status, health status, exercise frequency, average time spent exercising, different supplements used, used supplements sources, and health beliefs regarding dietary supplements were obtained. A total of 445 fitness center members agreed to participate, and 198 of them reported taking dietary supplements. Most participants were between the age of 18 and 25 years (66%), had a college degree (74%), non-smokers (77%), healthy (84%), and perform exercise at least thrice weekly (52%) for at least 1 hour (63%). The percentage of participants who had favorable health views on dietary supplements was significantly higher among the supplement users than among the non-users (P<0.0001). Proteins, multivitamins, amino acids, and omega 3 fatty acids were the most commonly reported supplements used. Almost 30% of the supplement users reported buying them overseas, 28% online, 25% from a pharmacy or supplement store, 19% from a medical clinic, and 17% from peddlers. Public health campaigns are needed to educate the public on the potential harmful effects of supplements if purchased from an unofficial seller or taken without seeking medical advice before using them.
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Affiliation(s)
- Yazed AlRuthia
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
- Pharmacoeconomics Research Unit, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
- * E-mail:
| | - Bander Balkhi
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
- Pharmacoeconomics Research Unit, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Marwan Alrasheed
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed Altuwaijri
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohammad Alarifi
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Huda Alzahrani
- Department of Pharmacy, King Khalid University Hospital, Riyadh, Saudi Arabia
| | - Wael Mansy
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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19
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Rubeor A, Goojha C, Manning J, White J. Does Iron Supplementation Improve Performance in Iron-Deficient Nonanemic Athletes? Sports Health 2018; 10:400-405. [PMID: 29792778 PMCID: PMC6116100 DOI: 10.1177/1941738118777488] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
CONTEXT Supplementing iron-deficient nonanemic (IDNA) athletes with iron to improve performance is a trend in endurance sports. OBJECTIVES To investigate the benefits of iron on performance, identify a ferritin level cutoff in IDNA athletes, and determine which iron supplementation regimens are most effective. DATA SOURCES A search of the PubMed, CINAHL, Embase, ERIC, and Cochrane databases was performed in 2014 including all articles. Citations of pertinent review articles were also searched. In 2017, the search was repeated. STUDY SELECTION Inclusion criteria comprised studies of level 1 to 3 evidence, written in the English language, that researched iron supplementation in nonanemic athletes and reported performance outcomes. STUDY DESIGN Systematic review. LEVEL OF EVIDENCE Level 3. DATA EXTRACTION The search terms used included athletic performance, resistance training, athletes, physical endurance, iron, iron deficiency, supplement, non-anemic, low ferritin, ferritin, ferritin blood level, athletes, and sports. RESULTS A total of 1884 studies were identified through the initial database search, and 13 were identified through searching references of relevant review articles. A subsequent database search identified 46 studies. Following exclusions, 12 studies with a total of 283 participants were included. Supplementing IDNA athletes with iron improved performance in 6 studies (146 participants) and did not improve performance in the other 6 studies (137 participants). In the 6 studies that showed improved performance with iron supplementation, all used a ferritin level cutoff of ≤20 μg/L for treatment. Additionally, all studies that showed improved performance used oral iron as a supplement. CONCLUSION The evidence is equivocal as to whether iron supplementation in IDNA athletes improves athletic performance. Supplementing athletes with ferritin levels <20 μg/L may be more beneficial than supplementing athletes with higher baseline ferritin levels.
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Affiliation(s)
- Amity Rubeor
- Department of Family Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island
| | | | - Jeffrey Manning
- Department of Family Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island
| | - Jordan White
- Department of Family Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island
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20
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Lee EC, Fragala MS, Kavouras SA, Queen RM, Pryor JL, Casa DJ. Biomarkers in Sports and Exercise: Tracking Health, Performance, and Recovery in Athletes. J Strength Cond Res 2018; 31:2920-2937. [PMID: 28737585 PMCID: PMC5640004 DOI: 10.1519/jsc.0000000000002122] [Citation(s) in RCA: 181] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Lee, EC, Fragala, MS, Kavouras, SA, Queen, RM, Pryor, JL, and Casa, DJ. Biomarkers in sports and exercise: tracking health, performance, and recovery in athletes. J Strength Cond Res 31(10): 2920–2937, 2017—Biomarker discovery and validation is a critical aim of the medical and scientific community. Research into exercise and diet-related biomarkers aims to improve health, performance, and recovery in military personnel, athletes, and lay persons. Exercise physiology research has identified individual biomarkers for assessing health, performance, and recovery during exercise training. However, there are few recommendations for biomarker panels for tracking changes in individuals participating in physical activity and exercise training programs. Our approach was to review the current literature and recommend a collection of validated biomarkers in key categories of health, performance, and recovery that could be used for this purpose. We determined that a comprehensive performance set of biomarkers should include key markers of (a) nutrition and metabolic health, (b) hydration status, (c) muscle status, (d) endurance performance, (e) injury status and risk, and (f) inflammation. Our review will help coaches, clinical sport professionals, researchers, and athletes better understand how to comprehensively monitor physiologic changes, as they design training cycles that elicit maximal improvements in performance while minimizing overtraining and injury risk.
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Affiliation(s)
- Elaine C Lee
- 1Department of Kinesiology, University of Connecticut, Storrs, Connecticut; 2Quest Diagnostics, Madison, New Jersey; 3Department of Health, Human Performance, & Recreation, University of Arkansas, Fayetteville, Arkansas; 4Department of Biomedical Engineering and Mechanics, Virginia Tech University, Blacksburg, Virginia; and 5Department of Kinesiology, California State University, Fresno, California
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21
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Abstract
The use of dietary supplements is widespread among athletes in all sports and at all levels of competition, as it is in the general population. For the athlete training at the limits of what is sustainable, or for those seeking a shortcut to achieving their aims, supplements offer the prospect of bridging the gap between success and failure. Surveys show, however, that this is often not an informed choice and that the knowledge level among consumers is often low and that they are often influenced in their decisions by individuals with an equally inadequate understanding of the issues at stake. Supplement use may do more harm than good, unless it is based on a sound analysis of the evidence. Where a deficiency of an essential nutrient has been established by appropriate investigations, supplementation can provide a rapid and effective correction of the problem. Supplements can also provide a convenient and time-efficient solution to achieving the necessary intake of key nutrients such as protein and carbohydrate. Athletes contemplating the use of supplements should consider the potential for both positive and negative outcomes. Some ergogenic supplements may be of benefit to some athletes in some specific contexts, but many are less effective than is claimed. Some may be harmful to health of performance and some may contain agents prohibited by anti-doping regulations. Athletes should make informed choices that maximize the benefits while minimizing the risks.
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22
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Abstract
Nutrition assessment is a necessary first step in advising athletes on dietary strategies that include dietary supplementation, and in evaluating the effectiveness of supplementation regimens. Although dietary assessment is the cornerstone component of the nutrition assessment process, it should be performed within the context of a complete assessment that includes collection/evaluation of anthropometric, biochemical, clinical, and environmental data. Collection of dietary intake data can be challenging, with the potential for significant error of validity and reliability, which include inherent errors of the collection methodology, coding of data by dietitians, estimation of nutrient composition using nutrient food tables and/or dietary software programs, and expression of data relative to reference standards including eating guidance systems, macronutrient guidelines for athletes, and recommended dietary allowances. Limitations in methodologies used to complete anthropometric assessment and biochemical analysis also exist, as reference norms for the athlete are not well established and practical and reliable biomarkers are not available for all nutrients. A clinical assessment collected from history information and the nutrition-focused physical exam may help identify overt nutrient deficiencies but may be unremarkable in the well-trained athlete. Assessment of potential food-drug interactions and environmental components further helps make appropriate dietary and supplement recommendations. Overall, the assessment process can help the athlete understand that supplement intake cannot make up for poor food choices and an inadequate diet, while a healthy diet helps ensure maximal benefit from supplementation. Establishment of reference norms specifically for well-trained athletes for the nutrition assessment process is a future research priority.
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Lazović M, Milenković J, Bojanić N, Bojanić Z. PATHOPHYSIOLOGICAL A SPECTS OF OLIGOELEMENT SUPPLEMENTATION IN A THLETES. ACTA MEDICA MEDIANAE 2018. [DOI: 10.5633/amm.2018.0208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Epstein D, Borohovitz A, Merdler I, Furman M, Atalli E, Sorkin A, Stainfeld Y, Isenberg Y, Mashiach T, Shapira S, Weisshof R, Dann EJ. Prevalence of Iron Deficiency and Iron Deficiency Anemia in Strenuously Training Male Army Recruits. Acta Haematol 2018; 139:141-147. [PMID: 29478071 DOI: 10.1159/000485736] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 11/25/2017] [Indexed: 11/19/2022]
Abstract
OBJECTIVES The objectives of our study were to determine the effect of strenuous physical training on the prevalence of iron deficiency anemia (IDA), iron deficiency (ID) with normal hemoglobin (Hb), and anemia without ID. METHODS Our study was a prospective observational study. We followed 115 healthy male recruits in the Israel Defense Forces elite units during 15 months of training. Blood samples were collected at recruitment and at 6-, 9- and 15-month follow-ups. RESULTS Upon recruitment, anemia (Hb < 14 g/dL), ID, and ID anemia (IDA) were diagnosed in 28, 31, and 9% of individuals, respectively. Sixty-three subjects (54%) were followed for 6 months; 9 of them (14%) developed new-onset IDA. Among them, the prevalence of anemia rose from 19 to 52%, and ID from 33 to 35%. At the 15-month follow-up, 29% had developed new-onset IDA and 65% showed evidence of ID. CONCLUSION We report a high prevalence of anemia, ID, and IDA among young healthy males participating in prolonged strenuous training programs. These findings can be partly explained by the physiological changes associated with strenuous physical activity. Further investigations aiming to develop specific diagnostic guidelines for this unique population are warranted.
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Affiliation(s)
- Danny Epstein
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Rambam Health Care Campus, Haifa, Israel
| | - Ariel Borohovitz
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Ilan Merdler
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Moran Furman
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Emmanuel Atalli
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
| | - Alex Sorkin
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Assaf HaRofeh Medical Center, Tzrifin, Israel
| | - Yaniv Stainfeld
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Rambam Health Care Campus, Haifa, Israel
| | - Yoni Isenberg
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
- Rambam Health Care Campus, Haifa, Israel
| | | | - Shachar Shapira
- Israeli Medical Corps, Israel Defense Forces, Tel HaShomer, Israel
| | | | - Eldad J Dann
- Rambam Health Care Campus, Haifa, Israel
- Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
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Effects of an Acute Exercise Bout on Serum Hepcidin Levels. Nutrients 2018; 10:nu10020209. [PMID: 29443922 PMCID: PMC5852785 DOI: 10.3390/nu10020209] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 01/30/2018] [Accepted: 02/11/2018] [Indexed: 02/07/2023] Open
Abstract
Iron deficiency is a frequent and multifactorial disorder in the career of athletes, particularly in females. Exercise-induced disturbances in iron homeostasis produce deleterious effects on performance and adaptation to training; thus, the identification of strategies that restore or maintain iron homeostasis in athletes is required. Hepcidin is a liver-derived hormone that degrades the ferroportin transport channel, thus reducing the ability of macrophages to recycle damaged iron, and decreasing iron availability. Although it has been suggested that the circulating fraction of hepcidin increases during early post-exercise recovery (~3 h), it remains unknown how an acute exercise bout may modify the circulating expression of hepcidin. Therefore, the current review aims to determine the post-exercise expression of serum hepcidin in response to a single session of exercise. The review was carried out in the Dialnet, Elsevier, Medline, Pubmed, Scielo and SPORTDiscus databases, using hepcidin (and “exercise” or “sport” or “physical activity”) as a strategy of search. A total of 19 articles were included in the review after the application of the inclusion/exclusion criteria. This search found that a single session of endurance exercise (intervallic or continuous) at moderate or vigorous intensity (60–90% VO2peak) stimulates an increase in the circulating levels of hepcidin between 0 h and 6 h after the end of the exercise bout, peaking at ~3 h post-exercise. The magnitude of the response of hepcidin to exercise seems to be dependent on the pre-exercise status of iron (ferritin) and inflammation (IL-6). Moreover, oxygen disturbances and the activation of a hypoxia-induced factor during or after exercise may stimulate a reduction of hepcidin expression. Meanwhile, cranberry flavonoids supplementation promotes an anti-oxidant effect that may facilitate the post-exercise expression of hepcidin. Further studies are required to explore the effect of resistance exercise on hepcidin expression.
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Abstract
PURPOSE To investigate energy intake, energy expenditure, and the nutritional status of young female elite football players using 7-day food and activity records and blood parameters. METHODS A total of 56 female elite football players [14.8 (0.7) y] completed the requested food and activity protocols. Misreporting was assessed by the ratio of energy intake to energy expenditure. The food records were analyzed concerning energy and macronutrient and micronutrient intakes, and energy expenditure was calculated using predictive equations. Hematological data and 25-hydroxyvitamin D serum concentrations were determined. RESULTS Mean energy intake was 2262 (368) kcal/d [40.5 (7.0) kcal/kg/d] and estimated EE averaged 2403 (195) kcal/d. Fifty-three percent of the players exhibited an energy availability <30 kcal/kg lean body mass; 31% of the athletes consumed <5 g/kg carbohydrates and 34% consumed <1.2 g/kg proteins. A large proportion of players (%) had intakes below the recommended daily allowance of folate (75%), vitamin D (100%), iron (69%), and calcium (59%). Ferritin and 25-hydroxyvitamin D serum levels were below the recommendations of 59% and 38%, respectively. CONCLUSIONS A remarkable number of players failed to meet the energy balance and the recommended carbohydrate and protein intakes. Low iron and 25-hydroxyvitamin D serum levels were observed showing a suboptimal nutrition status of some young female football players. As a consequence, strategies have to be developed for a better information and application of sport nutrition practice among young female football players.
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Pedlar CR, Brugnara C, Bruinvels G, Burden R. Iron balance and iron supplementation for the female athlete: A practical approach. Eur J Sport Sci 2017; 18:295-305. [PMID: 29280410 DOI: 10.1080/17461391.2017.1416178] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Maintaining a positive iron balance is essential for female athletes to avoid the effects of iron deficiency and anaemia and to maintain or improve performance. A major function of iron is in the production of the oxygen and carbon dioxide carrying molecule, haemoglobin, via erythropoiesis. Iron balance is under the control of a number of factors including the peptide hormone hepcidin, dietary iron intake and absorption, environmental stressors (e.g. altitude), exercise, menstrual blood loss and genetics. Menstruating females, particularly those with heavy menstrual bleeding are at an elevated risk of iron deficiency. Haemoglobin concentration [Hb] and serum ferritin (sFer) are traditionally used to identify iron deficiency, however, in isolation these may have limited value in athletes due to: (1) the effects of fluctuations in plasma volume in response to training or the environment on [Hb], (2) the influence of inflammation on sFer and (3) the absence of sport, gender and individually specific normative data. A more detailed and longitudinal examination of haematology, menstrual cycle pattern, biochemistry, exercise physiology, environmental factors and training load can offer a superior characterisation of iron status and help to direct appropriate interventions that will avoid iron deficiency or iron overload. Supplementation is often required in iron deficiency; however, nutritional strategies to increase iron intake, rest and descent from altitude can also be effective and will help to prevent future iron deficient episodes. In severe cases or where there is a time-critical need, such as major championships, iron injections may be appropriate.
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Affiliation(s)
- Charles R Pedlar
- a School of Sport, Health and Applied Science , St Mary's University , Twickenham , UK.,b Cardiovascular Performance Program , Massachusetts General Hospital , Boston , MA , USA
| | - Carlo Brugnara
- c Department of Laboratory Medicine , Boston Children's Hospital , Boston , MA , USA
| | - Georgie Bruinvels
- a School of Sport, Health and Applied Science , St Mary's University , Twickenham , UK
| | - Richard Burden
- a School of Sport, Health and Applied Science , St Mary's University , Twickenham , UK
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Goto K, Kasai N, Kojima C, Ishibashi A. Postexercise serum hepcidin response to repeated sprint exercise under normoxic and hypoxic conditions. Appl Physiol Nutr Metab 2017; 43:221-226. [PMID: 28961407 DOI: 10.1139/apnm-2017-0418] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We determined the effects of repeated sprint exercise under normoxic and hypoxic conditions on serum hepcidin levels. Ten male athletes (age: 20.9 ± 0.3 years; height: 175.7 ± 6.0 cm; weight: 67.3 ± 6.3 kg) performed 2 exercise trials under normoxic (NOR; fraction of inspiratory oxygen (FiO2): 20.9%) or hypoxic conditions (HYPO; FiO2: 14.5%). The exercise consisted of 3 sets of 5 × 6 s of maximal pedaling (30-s rest periods between sprints, 10-min rest periods between sets). Blood samples were collected before exercise, immediately after exercise, and 1 and 3 h after exercise. Serum hepcidin levels were significantly elevated after exercise in both trials (both P < 0.01), with no significant difference between the trials. The postexercise blood lactate levels were significantly higher in the HYPO than the NOR (P < 0.05). Both trials caused similar increases in plasma interleukin-6 and serum iron levels (P < 0.001), with no significant difference between the trials. A significant interaction (trial × time) was apparent in terms of serum erythropoietin (EPO) levels (P = 0.003). The EPO level was significantly higher in the HYPO than the NOR at 3 h after exercise (P < 0.05). In conclusion, repeated sprint exercise significantly increased serum hepcidin levels to similar extent in 2 trials, despite differences in the inspired oxygen concentrations during both the exercise and the 3-h postexercise period.
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Affiliation(s)
- Kazushige Goto
- a Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan
| | - Nobukazu Kasai
- a Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan
| | - Chihiro Kojima
- a Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan
| | - Aya Ishibashi
- a Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan.,b Department of Sports Science, Japan Institute of Sports Science, Kitaku, Tokyo, 525-8577, Japan
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Abstract
OBJECTIVE To assess the incidence of iron deficiency (ID), and iron deficient anemia (IDA) within a cohort of highly trained runners and triathletes, and to examine the association of oral iron supplementation history with serum ferritin (sFe) and hemoglobin (Hb) concentrations. METHODS A retrospective analysis of routine blood test data taken from 2009 to 2015 from (n = 38) elite level runners and triathletes between the ages of 21 to 36 years. Oral iron supplement intake was assessed through a questionnaire. RESULTS Triathletes (female, FT; male, MT) and runners (female, FR; male, MR) had higher incidence of at least 1 episode of ID (FT 60.0%, MT 37.5%, FR 55.6%, MR 31.3%) compared with values reported in the literature for endurance athletes (20%-50% females, 0%-17% males). Male triathletes and runners had a higher incidence of IDA than their female teammates (25% MT, 20% FT, 6.3% for MR, 0% FR), a finding which has previously not been reported. Hemoglobin concentrations were low, with incidence of Hb <140 g/L in men occurring at least once in 87.5% of triathletes, and 31.3% of runners, and Hb <120 g/L in women occurring at least once in 20% of triathletes, but 0% of runners. Although the athletes were appropriately treated with oral iron (mean 94 ± 115 mg/d), there was no observed correlation between iron intake and sFe or Hb. CONCLUSIONS Even with monitoring and treatment in place, ID and IDA are significant concerns for the health and performance of elite runners and triathletes, and this issue affects males and females.
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Goto K, Sumi D, Kojima C, Ishibashi A. Post-exercise serum hepcidin levels were unaffected by hypoxic exposure during prolonged exercise sessions. PLoS One 2017; 12:e0183629. [PMID: 28829838 PMCID: PMC5567555 DOI: 10.1371/journal.pone.0183629] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 07/30/2017] [Indexed: 12/21/2022] Open
Abstract
The purpose of the present study was to determine the influence of hypoxic exposure during prolonged endurance exercise sessions (79 min in total) on post-exercise hepcidin levels in trained male endurance athletes. Ten endurance athletes (mean ± standard deviation; height: 169.8 ± 7.1 cm, weight: 57.1 ± 5.0 kg) conducted two endurance exercise sessions under either a normobaric hypoxic condition [inspired O2 fraction (FiO2) = 14.5%] or a normoxic condition (FiO2 = 20.9%). Exercise consisted of 10 × 3 min running on a treadmill at 95% of maximal oxygen uptake ([Formula: see text]) with 60s of active rest at 60% of [Formula: see text]. After 10 min of rest, they subsequently performed 30 min of continuous running at 85% of [Formula: see text]. Running velocities were significantly lower in the HYPO than in the NOR (P < 0.0001). Exercise-induced blood lactate elevation was significantly greater in the HYPO (P < 0.01). There were significant increases in plasma interleukin-6, serum iron, and blood glucose levels after exercise, with no significant difference between the trials [interaction (trial × time) or main effect for trial, P > 0.05]. Serum hepcidin levels increased significantly 120 min after exercise (HYPO: from 10.7 ± 9.4 ng/mL to 15.8 ± 11.2 ng/mL; NOR: from 7.9 ± 4.7 ng/mL to 13.2 ± 7.9 ng/mL, P < 0.05), and no difference was observed between the trials. In conclusion, endurance exercise at lower running velocity in hypoxic conditions resulted in similar post-exercise hepcidin elevations as higher running velocity in normoxic conditions.
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Affiliation(s)
- Kazushige Goto
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
- Faculty of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
- * E-mail:
| | - Daichi Sumi
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Chihiro Kojima
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Aya Ishibashi
- Graduate School of Sports and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
- Japan Institute of Sports Sciences, Kitaku, Tokyo, Japan
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Buyukyazi G, Ulman C, Çelik A, Çetinkaya C, Şişman AR, Çimrin D, Doğru Y, Kaya D. The effect of 8-week different-intensity walking exercises on serum hepcidin, IL-6, and iron metabolism in pre-menopausal women. Physiol Int 2017; 104:52-63. [DOI: 10.1556/2060.104.2017.1.7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Objective
Hepcidin may be an important mediator in exercise-induced iron deficiency. Despite the studies investigating acute exercise effects on hepcidin and markers of iron metabolism, we found no studies examining the chronic effects of walking exercises (WE) on hepcidin and markers of iron metabolism in premenopausal women. The chronic effects of two 8-week different-intensity WE on hepcidin, interleukin 6 (IL-6), and markers of iron metabolism in pre-menopausal women were examined.
Methods
Exercise groups (EG) [moderate tempo walking group (MTWG), n = 11; brisk walking group (BWG), n = 11] walked 3 days/week, starting from 30 to 51 min. Control group (CG; n = 8) did not perform any exercises. BWG walked at ∼70%–75%; MTWG at ∼50%–55% of HRRmax. VO2max, hepcidin, IL-6, and iron metabolism markers were determined before and after the intervention.
Results
VO2max increased in both EGs, favoring the BWG. Hepcidin increased in the BWG (p < 0.01) and CG (p < 0.05). IL-6 decreased in the BWG and the MTWG (p < 0.05; p < 0.01). While iron, ferritin, transferrin, and transferrin saturation levels did not change in any group, total iron binding capacity (p < 0.05), red blood cells (p < 0.05), and hematocrit (p < 0.01) increased only in the BWG.
Conclusion
Both WE types may be useful to prevent inflammation. However, brisk walking is advisable due to the positive changes in VO2max and some iron metabolism parameters, which may contribute to prevent iron deficiency. The increase in hepcidin levels remains unclear and necessitates further studies.
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Affiliation(s)
- G Buyukyazi
- 1 School of Sport Sciences and Technology, Dokuz Eylül University, Izmir, Turkey
| | - C Ulman
- 2 Department of Biochemistry, Faculty of Medicine, Celal Bayar University, Manisa, Turkey
| | - A Çelik
- 1 School of Sport Sciences and Technology, Dokuz Eylül University, Izmir, Turkey
| | - C Çetinkaya
- 1 School of Sport Sciences and Technology, Dokuz Eylül University, Izmir, Turkey
| | - AR Şişman
- 3 Department of Biochemistry, Faculty of Medicine, Dokuz Eylül University, Izmir, Turkey
| | - D Çimrin
- 3 Department of Biochemistry, Faculty of Medicine, Dokuz Eylül University, Izmir, Turkey
| | - Y Doğru
- 4 Department of Biochemistry, School of Physical Education and Sports, Ege University, Izmir, Turkey
| | - D Kaya
- 5 Department of Cardiology, Faculty of Medicine, Dokuz Eylül University, Izmir, Turkey
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Relationship between the Ingestion of a Polyphenol-Rich Drink, Hepcidin Hormone, and Long-Term Training. Molecules 2016; 21:molecules21101333. [PMID: 27740603 PMCID: PMC6273972 DOI: 10.3390/molecules21101333] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 09/28/2016] [Accepted: 10/01/2016] [Indexed: 12/21/2022] Open
Abstract
The effects of polyphenol-rich foods on the iron status of athletes, as well as the effect of physical training on the hormone hepcidin, implicated in iron metabolism, are not clear. We investigated the influence on iron metabolism of a long-term training intervention of 120 days, measuring the hepcidin concentration in the plasma of 16 elite triathletes, and the effect of the ingestion of 200 mL of either aronia-citrus juice or a placebo drink for 45 days, in a crossover design. The highest plasma hepcidin concentrations were observed at the beginning of the study (116 ± 63 nM) and levels steadily decreased until the end of the intervention (final value 10 ± 7.5 nM). Long-term training might reduce inflammation and, hence, could be responsible for the decrease in hepcidin in triathletes. Polyphenols from aronia-citrus juice did not interfere in iron absorption, as we did not observe significant differences between the intake of the placebo drink or juice with regard to hepcidin levels. Further studies are required to ascertain the time and conditions necessary to restore hepcidin levels, which reflect the iron status of triathletes.
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Smoliga JM, Mohseni ZS, Berwager JD, Hegedus EJ. Common causes of dyspnoea in athletes: a practical approach for diagnosis and management. Breathe (Sheff) 2016; 12:e22-37. [PMID: 27408644 PMCID: PMC4933616 DOI: 10.1183/20734735.006416] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Key points Educational aims Dyspnoea during exercise is a common chief complaint in athletes and active individuals. It is not uncommon for dyspnoeic athletes to be diagnosed with asthma, “exercise-induced asthma” or exercise-induced bronchoconstriction based on their symptoms, but this strategy regularly leads to misdiagnosis and improper patient management. Dyspnoea during exercise can ultimately be caused by numerous respiratory and nonrespiratory conditions, ranging from nonpathological to potentially fatal in severity. As, such it is important for healthcare providers to be familiar with the many factors that can cause dyspnoea during exercise in seemingly otherwise-healthy individuals and have a general understanding of the clinical approach to this patient population. This article reviews common conditions that ultimately cause athletes to report dyspnoea and associated symptoms, and provides insight for developing an efficient diagnostic plan. Dyspnoea, fatigue and underperformance are often interrelated symptoms in athletes, and may have various causeshttp://ow.ly/4nsYnk
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Affiliation(s)
- James M Smoliga
- Dept of Physical Therapy, High Point University, High Point, NC, USA
| | - Zahra S Mohseni
- Dept of Biology, North Carolina State University, Raleigh, NC, USA
| | | | - Eric J Hegedus
- Dept of Physical Therapy, High Point University, High Point, NC, USA
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35
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Beals KA, Mitchell A. Recent Recommendations and Current Controversies in Sport Nutrition. Am J Lifestyle Med 2015. [DOI: 10.1177/1559827613513410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Adequate nutrition is absolutely essential for optimal training and performance of the athlete. Unfortunately many athletes lack sufficient nutrition knowledge to guide proper food choices. Similarly, the health professionals that athletes most frequently turn to for nutrition advice are often ill-equipped to address specific nutritional needs and issues. This article will summarize the most recent macronutrient (i.e., carbohydrate, protein and fat) and fluid recommendations for athletes. Micronutrients that have been shown to be inadequate in the diets of athletes will also be addressed. Finally, current controversies in sport nutrition will be examined in light of the most recent research and guidelines for applications to the athlete will be provided.
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Mielgo-Ayuso J, Zourdos MC, Calleja-González J, Urdampilleta A, Ostojic S. Iron supplementation prevents a decline in iron stores and enhances strength performance in elite female volleyball players during the competitive season. Appl Physiol Nutr Metab 2015; 40:615-22. [PMID: 25965846 DOI: 10.1139/apnm-2014-0500] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The primary aim of this study was to examine the effects of 11 weeks of iron supplementation on hematological and strength markers in elite female volleyball players. Twenty-two volleyball players (aged 27.0 ± 5.6 years) from 2 Spanish First National League teams participated and were counterbalanced into 1 of 2 groups based upon iron status: (i) control group (CG, n = 11); or (ii) iron treatment group (ITG, n = 11), which received 325 mg/day of ferrous sulphate daily. Subjects performed their team's regimen of training or match play every day. Both groups were tested for hematological and strength levels at 2 points: (i) baseline (T0, before preseason) and (ii) 11 weeks later (T11, post-testing). Hematological parameters were serum iron (sFe), serum ferritin (FER), transferrin saturation index (TSI), and hemoglobin (Hb); strength assessments were bench press, military press, half-squat, power clean, clean and jerk, and pull-over. CG experienced a significant decrease (p < 0.05) for sFe (T0, 112.7 ± 31.5; T11, 69.0 ± 20.5 μg·dL(-1); -33.9%), FER (T0, 60.2 ± 28.6; T11, 38.2 ± 16.4 ng·mL(-1); -34.6%), TSI (T0, 29.4% ± 9.5%; T11, 17.4% ± 5.1%; -35.3%), and Hb (T0, 14.1 ± 1.0; T11, 13.0 ± 0.8 g·L(-1); -7.44%); however, ITG experienced no changes (p > 0.05). Consequently, in ITG all hematological parameters were significantly greater (p < 0.05) than CG at T11. There was greater (p < 0.05) percent increase in the clean and jerk (CG: +5.1% ± 20.9 vs. ITG: +29.0% ± 21.3%), power clean (CG: -5.8% ± 30.3% vs. ITG: +44.6% ± 56.6%), and total mean strength (CG: +10.9% ± 3.2% vs. ITG: +26.2% ± 3.6%) in ITG. Our findings suggest that oral iron supplementation prevents iron loss and enhances strength in female volleyball players during the competitive season.
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Affiliation(s)
- Juan Mielgo-Ayuso
- ImFINE Research Group, Department of Health and Human Performance, Faculty of Physical Activity and Sport Science-INEF, Technical University of Madrid, 28040 Madrid, Spain., Department of Nutrition and Dietetics, Haro Volleyball Club, Nutrition Centre of La Rioja, 26200 Haro, La Rioja, Spain
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Zaitseva IP, Skalny AA, Tinkov AA, Berezkina ES, Grabeklis AR, Skalny AV. The influence of physical activity on hair toxic and essential trace element content in male and female students. Biol Trace Elem Res 2015; 163:58-66. [PMID: 25388755 DOI: 10.1007/s12011-014-0172-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 10/31/2014] [Indexed: 10/24/2022]
Abstract
The primary aim of the current study is to estimate the effect of different physical activity levels on hair trace element content in male and female students. A total of 113 students (59 women and 54 men) of P. G. Demidov Yaroslavl State University (Yaroslavl, Russia) took part in the current investigation. According to the level of the physical activity, all students were divided into three groups: high, medium, and low physical activity. Essential and toxic metal content (μg/g) in hair samples was assessed by inductively coupled plasma mass spectrometry using NexION 300D + NWR213 (Perkin-Elmer, USA). The obtained data show that hair iodine, zinc, arsenic, nickel, and tin levels are not related to physical activity in male and female students. At the same time, increased physical activity is associated with decreased hair copper, vanadium, bismuth, and mercury content in comparison to the low physical activity groups. Students with higher physical activity are also characterized by significantly higher hair cobalt, iron, manganese, selenium, cadmium, lithium, and lead concentrations. Finally, statistical analysis has revealed maximal gender differences in hair trace element content in the high physical activity groups, whereas in the low activity groups, the hair metal concentrations were nearly similar in females and males.
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Affiliation(s)
- Irina P Zaitseva
- Department of Physical Education and Sport, Yaroslavl State University, Sovetskaya st., 14, Yaroslavl, Russia, 150000
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Xu Z, Liu S, Wang H, Gao G, Yu P, Chang Y. Encapsulation of iron in liposomes significantly improved the efficiency of iron supplementation in strenuously exercised rats. Biol Trace Elem Res 2014; 162:181-8. [PMID: 25296704 DOI: 10.1007/s12011-014-0143-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 09/29/2014] [Indexed: 12/13/2022]
Abstract
To investigate the effect of iron liposome supplementation, a rat model of exercise-associated anemia was established by subjecting the animals to high-intensity running exercises for 4 weeks. Rats with confirmed anemia were strenuously exercised for another 2 weeks while receiving iron supplements by intragastric administration of ferric ammonium citrate (FAC) liposomes or heme iron liposomes. Control groups were administered equivalent amounts of FAC, heme iron, or blank liposomes. Subsequently, complete blood count (CBC), serum iron, and liver iron levels were tested to determine the efficiency of iron liposomes in relieving anemia. Superoxide dismutase (SOD) and malonyldialdehyde (MDA) were also detected to determine potential side effects of iron supplementation. The CBC, as well as serum iron and liver iron contents, significantly increased and reached much higher levels in anemic rats treated with iron liposomes, compared with those of control groups. The increase of SOD and decrease of MDA levels were also observed after supplementation with iron liposomes. These results demonstrate that iron liposomes can efficiently relieve the iron deficiency in strenuously exercised rats and may potentially be used as a supplement for the treatment of exercise-associated iron deficiency anemia with minimal side effects.
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Affiliation(s)
- Zi Xu
- Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Science, Hebei Normal University, Shijiazhuang, 050024, Hebei Province, People's Republic of China
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Skarpańska-Stejnborn A, Basta P, Trzeciak J, Szcześniak-Pilaczyńska Ł. Effect of intense physical exercise on hepcidin levels and selected parameters of iron metabolism in rowing athletes. Eur J Appl Physiol 2014; 115:345-51. [PMID: 25311752 PMCID: PMC4289533 DOI: 10.1007/s00421-014-3018-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 10/01/2014] [Indexed: 12/13/2022]
Abstract
Purpose Physical exercise, especially intense physical exercise, causes a number of unfavorable changes, including an increase in the level of pro-inflammatory cytokines with the resultant sequestration of iron in macrophages and decreased iron absorption. This can lead to a reduced supply of iron for erythroid progenitor cells and promote the development of anemia. Method This study included a group of 20 rowing athletes, members of the National Polish Rowing Team. The participants performed a 2,000-m maximum test on a rowing ergometer. Blood samples were taken from the antecubital vein prior to the exercise test, 1 min after completing the test, and after a 24-h recovery period. We determined the levels of hepcidin, interleukin 6 (IL-6), tumor necrosis factor α, soluble transferrin receptor, ferritin, total iron-binding capacity, unbound iron-binding capacity, iron, red blood cells, hemoglobin, hematocrit, mean corpuscular volume, creatine kinase, and myoglobin. Result The high-intensity exercise test caused significant changes in hepcidin levels, IL-6, and iron metabolism parameters, with their subsequent return to baseline values during the recovery period. The serum iron levels decreased significantly during the recovery compared with pre- and post-exercise levels. Conclusion These results suggest that the high-intensity ergometric test was reflected by a marked decrease in serum level of iron during the recovery period, but did not induce concomitant changes in the remaining erythrocyte parameters.
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Affiliation(s)
- Anna Skarpańska-Stejnborn
- Department of Morphological and Health Sciences, Faculty of Physical Culture in Gorzów Wlkp., Gorzów Wielkopolski, Poland,
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Abstract
Reticulocytes are young red blood cells which develop from erythroblasts and circulate in the bloodstream for about 1-4 days before maturing into erythrocytes. With the introduction of reticulocyte count in equations and statistical models for detecting suspected blood doping, its application to sports medicine has attracted growing interest in reticulocyte behavior during training and competition seasons in athletes and experimental blood doping treatment in healthy volunteers. An update on recent publications is therefore needed to improve the interpretation of reticulocyte analysis and its variability in sportsmen. Reticulocyte count constitutes a robust parameter during the preanalytical phase, but cell stability can be assured only if blood samples are kept at constantly cold temperatures (4 degrees C) and test results will differ depending on the blood analyzer system used. Marked intraindividual variability is the principal finding to be evaluated when exercise-induced changes are observed or illicit procedures suspected. Furthermore, reticulocyte variability is greater than that of other hematological parameters such as hemoglobin or hematocrit. Ideally, any variation should be interpreted against long-term time series for the individual athlete: values obtained from large athlete cohorts ought to be used only for extrapolating outliers that deserve further examination. Reticulocyte distribution in athletes is similar to that found in the general population, and a gender effect in some sports disciplines or selected athlete groups may be seen. Reticulocyte variability is strongly influenced by seasonal factors linked to training and competition schedules and by the type of sports discipline. Published experimental data have confirmed the high sensitivity of reticulocyte analysis in identifying abnormal bone marrow stimulation by either erythropoietin administration or blood withdrawal and reinfusion.
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Auersperger I, Škof B, Leskošek B, Knap B, Jerin A, Lainscak M. Exercise-induced changes in iron status and hepcidin response in female runners. PLoS One 2013; 8:e58090. [PMID: 23472137 PMCID: PMC3589469 DOI: 10.1371/journal.pone.0058090] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 01/30/2013] [Indexed: 12/21/2022] Open
Abstract
Background and Aims Exercise-induced iron deficiency is a common finding in endurance athletes. It has been suggested recently that hepcidin may be an important mediator in this process. Objective To determine hepcidin levels and markers of iron status during long-term exercise training in female runners with depleted and normal iron stores. Methods Fourteen runners were divided into two groups according to iron status. Blood samples were taken during a period of eight weeks at baseline, after training and after ten days’ recovery phase. Results Of 14 runners, 7 were iron deficient at baseline and 10 after training. Hepcidin was lower at recovery compared with baseline (p<0.05). The mean cell haemoglobin content, haemoglobin content per reticulocyte and total iron binding capacity all decreased, whereas soluble transferrin receptor and hypochromic red cells increased after training and recovery (p<0.05 for all). Conclusion The prevalence of depleted iron stores was 71% at the end of the training phase. Hepcidin and iron stores decreased during long-term running training and did not recover after ten days, regardless of baseline iron status.
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Affiliation(s)
| | - Branko Škof
- Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia
| | - Bojan Leskošek
- Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia
| | - Bojan Knap
- Department of Nephrology, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Aleš Jerin
- Institute of Clinical Chemistry and Biochemistry, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Mitja Lainscak
- Division of Cardiology, University Clinic Golnik, Golnik, Slovenia
- Applied Cachexia Research, Department of Cardiology, Charité, Campus Virchow-Klinikum, Berlin, Germany
- * E-mail:
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Hematological profile and martial status in rugby players during whole body cryostimulation. PLoS One 2013; 8:e55803. [PMID: 23383348 PMCID: PMC3562235 DOI: 10.1371/journal.pone.0055803] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 01/02/2013] [Indexed: 01/01/2023] Open
Abstract
Cold-based therapies are commonly applied to alleviate pain symptoms secondary to inflammatory diseases, but also to treat injuries or overuse, as done in sports rehabilitation. Whole body cryotherapy, a relatively new form of cold therapy, consists of short whole-body exposure to extremely cold air (−110°C to −140°C). Cryostimulation is gaining wider acceptance as an effective part of physical therapy to accelerate muscle recovery in rugby players. The aim of this study was to evaluate the effect of repeated cryostimulation sessions on the hematological profile and martial status markers in professional rugby players. Twenty-seven professional rugby players received 2 daily cryostimulation treatments for 7 consecutive days. Blood samples were collected before and after administration of the cryotherapic protocol and hematological profiles were obtained. No changes in the leukocyte count or composition were seen. There was a decrease in the values for erythrocytes, hematocrit, hemoglobin and mean corpuscular hemoglobin content, and an increase in mean corpuscular volume and red cell distribution width. Platelet count and mean volume remained unchanged. Serum transferrin and ferritin decreased, while soluble transferrin receptor increased. Serum iron and transferrin saturation were unchanged, as was reticulocyte count, whereas the immature reticulocyte fraction decreased substantially. In conclusion, in this sample of professional rugby players, cryostimulation modified the hematological profile, with a reduction in erythrocyte count and hemoglobinization paralleled by a change in martial status markers.
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Latunde-Dada GO. Iron metabolism in athletes - achieving a gold standard. Eur J Haematol 2012; 90:10-5. [DOI: 10.1111/ejh.12026] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/09/2012] [Indexed: 01/01/2023]
Affiliation(s)
- Gladys O. Latunde-Dada
- Diabetes and Nutritional Sciences Division; School of Medicine; King's College London; London; UK
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Foot-strike haemolysis after a 60-km ultramarathon. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2012; 10:377-83. [PMID: 22682343 DOI: 10.2450/2012.0167-11] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Accepted: 12/29/2011] [Indexed: 01/01/2023]
Abstract
BACKGROUND The various contributors to sport-related anaemia include increased plasma volume, exercise-induced oxidative stress, increased body temperature, acidosis, gastrointestinal bleeding, acute and chronic inflammation as well as compression and damage of red blood cells (RBC) in the capillaries within the contracting muscles. The effective contribution of foot-strike haemolysis is unclear. MATERIALS AND METHODS We studied 18 Caucasian male athletes (mean age, 42 years; range, 34-52 years) before and immediately after a 60-km ultramarathon. Laboratory investigations included the haematological profile along with haptoglobin, potassium, aspartate aminotransferase (AST), creatine kinase (CK), lactate dehydrogenase (LDH) and albumin concentrations and a haemolysis index (HI). RESULTS No significant variations were found in post-exercise values of haemoglobin, RBC count and haematocrit. Mean corpuscular volume and haptoglobin were significantly decreased, whereas RBC distribution width was increased. The concentration of haptoglobin was reduced by approximately 50%, whereas enzyme concentrations were all remarkably increased. The HI remained below 0.5 g/L. After adjusting for plasma volume change, the increases were 1.7% for potassium (P=0.17), 30% for AST (P<0.01), 49% for LDH (P<0.01) and 2.39-fold for CK (P<0.01). A statistically significant association was found between haemoconcentration-adjusted variations of CK and those of AST (r=0.803; P<0.01) and LDH (r=0.551; P=0.02). DISCUSSION This is the first study demonstrating that long-distance running does not induce clinically significant changes in haemoglobin, haematocrit, RBC count or potassium concentration. The significant post-exercise decrease of haptoglobin reflects a certain degree of haemolysis, but the concentration of cell-free haemoglobin remaining below 0.5 g/L and the non-significant variation in RBC count both indicate that the foot-strike haemolysis is very modest or even clinically negligible.
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Reinke S, Taylor WR, Duda GN, von Haehling S, Reinke P, Volk HD, Anker SD, Doehner W. Absolute and functional iron deficiency in professional athletes during training and recovery. Int J Cardiol 2012; 156:186-91. [DOI: 10.1016/j.ijcard.2010.10.139] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 09/30/2010] [Accepted: 10/31/2010] [Indexed: 01/01/2023]
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Frank MK, Esteves AM, Lopes C, Cavagnolli DA, Tufik S, de Mello MT. The effects of physical exercise on the serum iron profile in spontaneously hypertensive rats. Biol Trace Elem Res 2012; 145:222-4. [PMID: 21901434 DOI: 10.1007/s12011-011-9188-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Accepted: 08/18/2011] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to evaluate the profile of serum iron in spontaneously hypertensive rats after an aerobic physical exercise. To accomplish this, 12 normotensive Wistar rats and 12 spontaneously hypertensive rats were distributed into "physical exercise" and "no physical exercise" groups. The animals in the physical exercise group underwent to an aerobic exercise for a total of 4 weeks. Blood was collected for the analysis of iron. Our results indicate that rats of the physical exercise group had significantly lower serum iron levels after the aerobic exercise protocol compared to the spontaneously hypertensive rats no physical exercise group (F ((3,16)) = 4.4915, p < 0.01). No significant difference was found between no physical exercise groups. The results indicated that the difference in iron may be due to an increased demand for iron, prompted by chronic physical exercise. In addition, erythrocytosis has been associated with increased blood pressure in spontaneously hypertensive rats, suggesting that iron reduction may be related to decreased blood pressure in these animals.
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Affiliation(s)
- Miriam K Frank
- Departamento de Psicobiologia, Universidade Federal de São Paulo, Rua Prof. Francisco de Castro, 93, Vila Clementino, São Paulo, São Paulo, Brazil.
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Abstract
Adequate body stores of iron are necessary for optimal endurance exercise performance. Severe iron depletion resulting in overt iron-deficiency anemia clearly depresses endurance fitness, but it is not clear if milder degrees of iron deficiency (low serum ferritin with normal hemoglobin levels) impair physical capacity. The question is an important one for athletes, particularly females, who are particularly prone to iron deficiency without anemia. This review examines research data, in both animals and humans, which have addressed this issue. Constructing guidelines based on this often-conflicting body of information is difficult. Routine screening is advocated for at-risk athletes, particularly elite-level female competitors in distance sports, and, although controversial, many authorities recommend iron treatment for athletes with hypoferritemia (ferritin <12-20 ng/mL), even without overt anemia. However, “blind” supplementation with oral iron by athletes is not recommended.
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Affiliation(s)
- Thomas Rowland
- Department of Pediatrics, Baystate Medical Center, Springfield, Massachusetts
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Villanueva J, Soria M, González-Haro C, Ezquerra L, Nieto JL, Escanero JF. Oral iron treatment has a positive effect on iron metabolism in elite soccer players. Biol Trace Elem Res 2011; 142:398-406. [PMID: 20798998 DOI: 10.1007/s12011-010-8813-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Accepted: 08/10/2010] [Indexed: 10/19/2022]
Abstract
The purpose of this study was to assess the effects of oral iron supplementation on hematological and iron metabolism in elite soccer players. Thirty-five members of the Real Zaragoza SAD soccer team took part in this study: group A (GA, n = 24; Spanish Premier League) took an oral iron supplement of 80 mg day(-1) for 3 weeks, and group B (GB, n = 11; Spanish Third Division League) did not receive any supplementation. In GA, the parameters were measured before and after giving the iron supplements, while in GB, measurements were only made at the time of collecting the second set of data from GA. After supplementation, GA showed an increase in serum iron (SI) (P < 0.05), serum ferritin (Ftn) (P < 0.01), and transferrin saturation (Sat) (P < 0.01) with respect to the basal values. In addition, GA showed higher values of hematocrit (P < 0.01), mean corpuscular volume (P < 0.01), Ftn (P < 0.01), and Sat (P < 0.01) than GB. No significant differences were found in any other parameters. More specifically, a higher percentage of players had Ftn levels above upper limits in GA vs. GB (P < 0.05), and GB had a higher incidence of Ftn below lower limits with respect to subjects in GA (P < 0.01). Further, after treatment, 58.3% of GA had >800 mg of SI, while all players in GB presented levels below the lower limits. In conclusion, iron supplementation with 80 mg·day(-1) for 3 weeks, before the start of the soccer season, can be recommended for elite soccer players.
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Affiliation(s)
- Jesús Villanueva
- Medical Services of the Real Zaragoza Fútbol Club, Zaragoza, Spain
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Araújo LR, Martins MV, Silva JC, Silva RRD. Aspectos gerais da deficiência de ferro no esporte, suas implicações no desempenho e importância do diagnóstico precoce. REV NUTR 2011. [DOI: 10.1590/s1415-52732011000300012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A ingestão inadequada de ferro pode trazer consequências deletérias ao desempenho atlético. Os aspectos negativos provenientes da deficiência orgânica de ferro estão diretamente relacionados com os níveis de depleção desse mineral, que, em sua última instância, tem como principal agravo o desenvolvimento da anemia ferropriva. O presente artigo esclarece que, além da omissão férrica dietética, existem vários fatores agregados que não estão vinculados apenas à dieta, mas que, no conjunto, podem interferir sobre o balanço negativo do ferro, principalmente em atletas. Dentre os fatores etiológicos associados à prática esportiva, os mais evidentes são as hemorragias gastrintestinais, as hemólises por impacto e por radicais livres e as perdas férricas através da transpiração. Nota-se a suma importância do controle da ingestão de ferro e da manutenção de uma vigilância para a detecção precoce da deficiência desse mineral, evitando alteração na produção normal de hemoglobina e de outros compostos essenciais, o que pode causar redução considerável no desempenho do indivíduo, principalmente aeróbico. Embora seja crucial o papel da suplementação no restabelecimento do indivíduo com deficiência de ferro, a automedicação é contraindicada, devido às consequências negativas associadas às altas doses desse mineral. A abordagem desse tema é de extrema relevância para o meio esportivo, contendo informações sobre a anemia esportiva e o diagnóstico da deficiência de ferro, em uma revisão que visa o esclarecimento dos principais fatores etiológicos envolvidos.
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Iron status in elite young athletes: gender-dependent influences of diet and exercise. Eur J Appl Physiol 2011; 112:513-23. [PMID: 21594695 DOI: 10.1007/s00421-011-2002-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Accepted: 05/09/2011] [Indexed: 01/01/2023]
Abstract
Iron depletion seems to occur more frequently among athletes than in the general population and may affect performance capacity. Only little information is available about the prevalence of iron status abnormalities in young elite athletes and whether iron depletion is associated with gender, sport, age or nutrition- and exercise-related factors in this group. Hence, diet, exercise and haematological data from 193 elite athletes (96 males, 97 females; 16.2 ± 2.7 years) from 24 different sports were analyzed retrospectively. Most female athletes failed to meet the recommended daily allowance for iron, even though dietary iron density was higher than in males (5.75 ± 0.78 vs. 6.17 ± 0.98 mg/1,000 kcal; P = 0.001). Iron depletion (serum ferritin < 35 μg/L) occurred in 31% of male and 57% of female athletes (P < 0.001). Low haemoglobin (males: <13 g/dL; females: <12 g/dL) and haematocrit (males: <40%; females: <36%) values were equally prevalent in both genders [haemoglobin: 7.3% (males), 6.2% (females); haematocrit: 13.5% (males); 15.5% (females)]. In females, reduced ferritin levels were associated with a lower dietary iron density (5.9 ± 0.8 vs. 6.6 ± 1.1 mg/1,000 kcal; P = 0.002). Males with iron depletion had a significantly higher estimated energy expenditure (48.7 ± 7.0 vs. 44.4 ± 7.6 kcal/kg/day; P = 0.009).
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