The effect of the menstrual cycle on bioimpedance reliability

[摘要] The potential influence of the menstrual cycle on percentbody fat (%BF) measurements from bioimpedance analysis (BIA)was investigated on 36 female Ss (19-40 yr). Subjects weredivided into 2 groups based on oral contraceptive agent(OCA) use. Those women not using an OCA were placed intothe OFF group (n = 20) and those using an OCA were placedinto the ON group (n = 16). The menstrual cycle was dividedinto 4 phases: premenstrual, menstrual, postmenstrual, andintermenstrual. All subjects were weighed and tested for%BF using BIA a minimum of 12 times, at least 3 times withineach cycle phase. Subjects were also underwater weighed asingle time, approximately at the middle of their respectivecycles. Repeated measures ANQVAs were used to test forsignificance between and within groups for weight,resistance, and %BF across the 12 measurements and acrossthe 4 phases. No significance was found for any variabletested with the exception of weight within each group acrossthe 12 measurements (p < . 0 5 ) . Percent body fat data fromhydrostatic weighing (HW) were compared to BIA values fromeach of the 4 phases using a repeated measures ANOVA andPPMC. No significant differences were found (p > .05)between HW and BIA for any phase. The average correlationbetween HW and BIA was .78, SEE = 3.3%. Overall, neitherOCA use nor the menstrual cycle itself appeared to influence%BF measurements from BIA.

[发布机构] University of Wisconsin

[效力级别] Oral contraceptive

[关键词] Body composition - Measurement;Oral contraceptive;Menstrual cycle;Impedance - Bioelectric