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Unga kvinnors järnstatus i relation till aerob metabolism under cykelarbete.
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesisAlternative title
Young women's iron status in relation to aerobic metabolism during cycling workload (English)
Abstract [sv]

Introduktion: Järn är ett essentiellt spårämne vars främsta funktion i kroppen är att ingå i hemoglobin produktionen, en transportmolekyl för syre och koldioxid. Järnbrist är den vanligaste nutritionella bristen hos idrottare och kvinnor är i en särskild riskzon. Syfte: Att undersöka idrottande kvinnors järnstatus och eventuell relation till 1) aerob metabolism, 2) verkningsgrad, och 3) VO2max vid cykelarbete.  Metod: Deskriptiv tvärsnittsstudie. Testdeltagarnas medelålder 22 ± 5,8 år, medel VO2max 43,5 ± 4,6 ml/kg/min. Järnstatus jämfördes mot syreförbrukning, verkningsgrad och VO2max under ett ergometercykeltest. Blodprov togs med analys av testdeltagarnas serum ferritin-nivåer (sFer) där <29 ug/l antogs som låg och >30 ug/l som normal järnstatus Ett submaximalt och maximalt ergometercykeltest genomfördes på deltagarna. Analys gjordes i form av regressionsanalyser i JMP 13, för att förutspå ett samband. Resultat: Inget samband uppvisades mellan de olika parametrar som har jämförts. SFer hos deltagare (n=48) var ett medel på 23 ±11 ug/l. SFer och VO2/L/min vid 100 watt (r2=0.09, P<0.05), sFer och kcal/min (r2=0.05) och sFer och VO2max (r2=0.05). Konklusion: Huvudsakliga fyndet är att järnstatus inte har ett signifikant samband med aerob metabolism, trots att tidigare forskning har tytt på ett sådant. Fler deltagare med högre värden i ferritin och en tydligare standardisering runt träning, kost och menstruationscykeln hos kvinnorna som jämfördes skulle kunna ha gett ett annat resultat.

Abstract [en]

Introduction: Iron is an essential trace mineral whose main function in the body is to produce hemoglobin, a transport molecule for oxygen and carbon dioxide. Iron deficiency is the most common nutritional deficiency in athletes and women are at particular risk of becoming iron deficient.  Objective: Examine the iron status of athletic women and the possible relation to 1) aerobic metabolism, 2) efficacy, and 3) VO2max during cycling workload  Method: Descriptive cross-sectional study. The participants mean age is 22±5,8 year, mean VO2max 43,5 ±4,6 ml/kg/min. Iron status was compared to oxygen consumption, efficacy and VO2max during a ergometer cycle test. Blood samples with analysis of the participants serum ferritin (sFer) with a cut off value of <29 ug/l were considered as low and >30 ug/l were considered as normal iron status. A submaximal and maximal ergometer cycle test was conducted on the participants. Analysis was done in form of regression analysis in JMP 13, in order to try to predict a relationship. Result: No relationship was found between the different parameters that have been compared. SFer of participants (n=48) was an average of 23±11 ug/l. SFer and VO2/l/min at 100 watts (r2=.09, P<0.05), sFer and kcal/min (r2=0.05, sFer and sFer and VO2max (r2=0.05). Conclusion: The main findings is that iron status does not have a significant relationship with aerobic metabolism, although previous research has suggested such. More participants with bigger value of ferritin and a clearer standardization around the training, diet and menstrual cycle of the women compared could have given another result.   

Place, publisher, year, edition, pages
2018.
Keywords [en]
iron deficiency, aerobic metabolism, ferritin
Keywords [sv]
järnbrist, aerob metabolism, ferritin
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:umu:diva-149513OAI: oai:DiVA.org:umu-149513DiVA, id: diva2:1222311
Educational program
Physical Trainer Pogramme
Available from: 2018-06-20 Created: 2018-06-21

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