Bozzini Brittany N, Nguyen Vy T, Reynoso Marinaliz C, Guerriere Katelyn I, Walker Leila A, Taylor Kathryn M, Foulis Stephen A, Bouxsein Mary L, Hughes Julie M, Popp Kristin L
Military Performance Division, United States Army Research Institute of Environmental Medicine, Natick, MA.
Med Sci Sports Exerc. 2023 Sep 1;55(9):1533-1539. doi: 10.1249/MSS.0000000000003183. Epub 2023 Apr 14.
To determine whether changes in menstruation develop in female trainees during BCT and whether changes in body mass, body composition and/or physical activity are associated with menstrual interruption during BCT.
Female trainees grouped according to self-reported menstrual status in the 12 months before BCT as having regular cycles (RC; n = 352) or MD ( n = 97) completed height, body mass, and body composition assessments and questionnaires before and after BCT. Fisher's exact test and Mann-Whitney U test were used to compare between-group differences in categorical and continuous variables, respectively. Among RC trainees, odds ratios were calculated to examine the influence of changes in body mass, lean mass, and fat mass on a trainee's likelihood to miss a period during BCT.
There were no differences in race, height, body mass, body mass index, or physical activity history at pre-BCT between RC and MD ( P > 0.05). Overall, 86% of trainees experienced changes to menstruation during BCT. RC were more likely than MD to have at least one period during BCT (81% vs 69%, respectively, P = 0.01). Among RC, gaining more body mass and lean mass and losing less fat mass were associated with increased odds of missing a period during BCT.
These findings demonstrate that most female trainees experience menstrual changes during BCT. Menstrual cycle interruptions do not appear to align with loss of body or fat mass.
确定女性新兵在基础战斗训练（BCT）期间月经是否发生变化，以及体重、身体成分和/或体力活动的变化是否与BCT期间的月经中断有关。
根据新兵在BCT前12个月自我报告的月经状况分为月经周期规律组（RC；n = 352）或月经不规律组（MD；n = 97），在BCT前后完成身高、体重、身体成分评估和问卷调查。Fisher精确检验和Mann-Whitney U检验分别用于比较分类变量和连续变量的组间差异。在RC组新兵中，计算比值比以检验体重、去脂体重和脂肪量的变化对新兵在BCT期间月经推迟可能性的影响。
RC组和MD组在BCT前的种族、身高、体重、体重指数或体力活动史方面无差异（P > 0.05）。总体而言，86%的新兵在BCT期间月经发生变化。RC组比MD组在BCT期间至少有一次月经的可能性更大（分别为81%和69%，P = 0.01）。在RC组中，体重和去脂体重增加更多且脂肪量减少更少与BCT期间月经推迟的几率增加有关。
这些发现表明，大多数女性新兵在BCT期间月经会发生变化。月经周期中断似乎与体重或脂肪量的减少无关。
