title: Serum leptin concentration and anaerobic performance do not change during the menstrual cycle of young females.
abstract: OBJECTIVE
  It was aimed to determine whether there was a difference in the leptin levels and short term exercise performance during the menstrual cycle of the young females who had normal menstrual cycle and no pregnancy story.
  
  
  METHODS
  Fifteen sedentary females aged 19-23 yrs were included. All had regular menstrual cycle of 28-30 days and no pregnancy story. Blood samples were taken for the analysis of serum estradiol, progesterone and leptin levels and Wingate test was applied on a Monark 818E ergometer with 75 g/kg load on the 7th, 14th and 21st cycle days, randomly.
  
  
  RESULTS
  The differences in serum leptin levels and peak power, mean power and fatigue index during these days and the correlations between serum leptin and FSH, LH, estradiol and progesterone levels were not significant.
  
  
  CONCLUSIONS
  We concluded that performance in a short intense exercise which require high motivation is not affected by menstrual cycle and in young females with normal menstrual cycle, serum leptin concentration does not change during the cycle. Further studies constituting more standard groups, controlling food intake, timing the blood sampling, studying more days of menstrual cycle will help to obtain more accurate results.
authors.affiliation: Selcuk University, Meram Faculty of Medicine, Department of Physiology, Konya, Turkey.
authors.forename: Nilsel
authors.initials: N
authors.lastname: Okudan
authors.forename: Hakki
authors.initials: H
authors.lastname: Gökbel
authors.forename: Kağan
authors.initials: K
authors.lastname: Uçok
authors.forename: Abdülkerim
authors.initials: A
authors.lastname: Baltaci
mesh_terms: D000328:Adult; D004958:Estradiol / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006019:Glycolysis / Q000502:physiology*; D006801:Humans; D020738:Leptin / Q000097:blood*; D007986:Luteinizing Hormone / Q000097:blood; D008597:Menstrual Cycle / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D011374:Progesterone / Q000097:blood
chemical_list: D020738:Leptin; D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone