Medicine & Science in Sports & Exercise:
F-31 Free Communication/Poster - Nutritional Interventions: JUNE 4, 2010 1:00 PM - 6:00 PM: ROOM: Hall C
Nicewonger, Christine; Flohr, Judith A.; Todd, M Kent; Womack, Christopher J. FACSM
James Madison University, Harrisonburg, VA.
(No disclosure reported)
Fifty percent of all active females may have some form of iron deficiency, which could lead to a compromise in athletic performance.
PURPOSE: The purpose of the study was to determine the effect of 7 days iron supplementation during menses on blood markers for iron status, high intensity exercise performance, and heart rate recovery (HRREC).
METHODS: Twenty five active females (age=21.1 yrs, VO2max ≥ 45 mL.kg-1.min-1 or 8 hrs vigorous training/week) completed a Yo-Yo Intermittent Recovery Test Level 2 (YY2) and a blood draw before and after 7 days of iron supplementation (IRON, 65mg ferrous sulfate N=9), or a placebo (PLC, N=16). Blood was analyzed for blood lactate, hemoglobin (Hb), serum ferritin (sFer) and Hematocrit. Participants also completed a 7-day physical activity recall, O'Connor subjective fatigue scales (PF), muscle soreness scale (MS), and a supplement adherence journal. Heart rate was monitored before, during and after the YY2.
RESULTS: There were no significant differences between IRON and PLC groups at baseline. ANOVA indicated significant differences between groups in sFer (p= 0.008) and Hb (p= 0.040) following 7 days of treatment. MS tended to decrease in IRON (p=0.052) and increase in PLC (p=0.051).
CONCLUSION: One week of treatment had a positive effect on sFer and Hb levels in the IRON group. The impact of iron supplementation on MS, HRREC, PF and YY2 remains unclear at this time.
Funded by Morrison Bruce Center and JMU CISAT Mini Grant Award.