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- W4387062790 abstract "Hematocrit (Hct) is a ratio of red blood cells to plasma in a blood sample. When this ratio increases, the ability to carry oxygen increases. When biological females go through the menstrual cycle, time durations of blood loss result in a reduced oxygen-carrying capacity. PURPOSE: This study aimed to investigate whether a change in hematocrit due to menstruation-associated blood loss significantly affects maximal exercise performance. METHODS: We conducted VO2max tests on four moderately trained females ages 18-22 yr. Each subject completed three VO2max tests on a bike: a familiarization day and two test days. Test day 1 corresponded to day 7 of their cycle, when hematocrit was predicted to be the lowest. Test day 2 corresponded to day 14 of their cycle when hematocrit was predicted to be fully recovered. RESULTS: Statistical significance was found between absolute VO2max on test day 1 (2.4 ± 0.5 L/min) and test day 2 (2.6 ± 0.5 L/min, p = 0.004). This was further supported by a significant difference in end wattage between test day 1 (232.3 ± 51.5 W) and test day 2 (239.7 ± 49.7 p = 0.037) and final time between test day 1 (12.2 ± 3.5 min) and test day 2 (12.6 ± 3.3 min p = 0.041). As anticipated, there was a significant difference in hematocrit between test day 1 (40.3 ± 3.1%) and test day 2 (42.0 ± 2.6%, p = 0.038). No statistically significant difference was found between relative VO2max on test day 1 (38.5 ± 8.4 mL/kg/min) and test day 2 (41.0 ± 9.1 mL/kg/min p = 0.068). CONCLUSION: We concluded that menstruation-associated blood loss points to significant changes in hematocrit which further affects maximal exercise performance in college-aged females." @default.
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- W4387062790 date "2023-09-01" @default.
- W4387062790 modified "2023-09-27" @default.
- W4387062790 title "Assessing The Menstruation-related Changes Of Hematocrit And Its Influence On Maximal Exercise Performance" @default.
- W4387062790 doi "https://doi.org/10.1249/01.mss.0000987416.01719.1b" @default.
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