Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts.
Thermal & Mountain Medicine Division, US Army Research of Environmental Medicine, Natick, Massachusetts.
J Strength Cond Res. 2024 Jun 1;38(6):e304-e309. doi: 10.1519/JSC.0000000000004735. Epub 2024 Feb 6.
Roberts, BM, Staab, JS, Caldwell, AR, Sczuroski, CE, Staab, JE, Lutz, LJ, Reynoso, M, Geddis, AV, Taylor, KM, Guerriere, KI, Walker, LA, Hughes, JM, and Foulis, SA. Sex does not affect changes in body composition and insulin-like growth factor-I during US Army basic combat training. J Strength Cond Res 38(6): e304-e309, 2024-Insulin-like growth factor 1 (IGF-I) has been implicated as a biomarker of health and body composition. However, whether changes in body composition are associated with changes in IGF-I is unclear. Therefore, we examined the relationship between body composition changes (i.e., fat mass and lean mass) and total serum IGF-I levels in a large cohort of young men ( n = 809) and women ( n = 397) attending US Army basic combat training (BCT). We measured body composition using dual energy x-ray absorptiometry and total serum IGF-I levels during week 1 and week 9 of BCT. We found that pre-BCT lean mass ( r = 0.0504, p = 0.082) and fat mass ( r = 0.0458, p = 0.082) were not associated with pre-BCT IGF-I. Body mass, body mass index, body fat percentage, and fat mass decreased, and lean mass increased during BCT (all p < 0.001). Mean (± SD ) IGF-I increased from pre-BCT (176 ± 50 ng·ml -1 ) to post-BCT (200 ± 50 ng·ml -1 , p < 0.001). Inspection of the partial correlations indicated that even when considering the unique contributions of other variables, increases in IGF-I during BCT were associated with both increased lean mass ( r = 0.0769, p = 0.023) and increased fat mass ( r = 0.1055, p < 0.001) with no sex differences. Taken together, our data suggest that although changes in IGF-I weakly correlated with changes in body composition, IGF-I, in isolation, is not an adequate biomarker for predicting changes in body composition during BCT in US Army trainees.
罗伯茨、斯塔布、考德威尔、斯库罗斯基、斯塔布、卢茨、雷纳索、格迪斯、泰勒、盖尔里、沃克、休斯和福利斯。美国陆军基础战斗训练期间，性别不影响身体成分和胰岛素样生长因子 I 的变化。J 力量与条件研究 38（6）：e304-e309，2024-胰岛素样生长因子 1（IGF-1）已被认为是健康和身体成分的生物标志物。然而，身体成分的变化是否与 IGF-1 的变化有关尚不清楚。因此，我们在参加美国陆军基础战斗训练（BCT）的大量年轻男性（n=809）和女性（n=397）中检查了身体成分变化（即脂肪量和瘦体重）与总血清 IGF-1 水平之间的关系。我们在 BCT 的第 1 周和第 9 周使用双能 X 射线吸收法测量身体成分和总血清 IGF-1 水平。我们发现，BCT 前瘦体重（r=0.0504，p=0.082）和脂肪量（r=0.0458，p=0.082）与 BCT 前 IGF-1 无关。在 BCT 期间，体重、体重指数、体脂百分比和脂肪量减少，瘦体重增加（均<0.001）。平均（±SD）IGF-1 从 BCT 前（176±50ng·ml-1）增加到 BCT 后（200±50ng·ml-1，p<0.001）。偏相关分析表明，即使考虑到其他变量的独特贡献，BCT 期间 IGF-1 的增加与瘦体重（r=0.0769，p=0.023）和脂肪量（r=0.1055，p<0.001）的增加相关，无性别差异。综上所述，我们的数据表明，尽管 IGF-1 的变化与身体成分的变化呈弱相关，但 IGF-1 单独作为预测美国陆军新兵在 BCT 期间身体成分变化的生物标志物并不充分。
