Department of Collective Health, Federal University of Maranhão, São Luís 65020-905, Maranhão, Brazil.
Department of Nutrition, Federal University of Piauí, Teresina 64049-550, Piauí, Brazil.
Nutrients. 2022 Aug 10;14(16):3259. doi: 10.3390/nu14163259.
: The interaction between lean body mass (LBM) and fat mass index (FMI) with grip strength (GS) has not been explored in the same analysis model in adolescents. This study thus aims to analyze the association between FMI and LBM with GS. : This cross-sectional study was conducted with data from the 2016 follow-up of the 1997/98 Birth Cohort of São Luís. Grip strength was assessed by the Jamar Plus + dynamometer. The LBM and FMI indexes were assessed [ratio of the mass (lean or fat-kg) to height (m)]. The confounding variables identified for the relationship between FMI and LBM with GS in the same analysis model, by directed acyclic graph (DAG), were sex, age, race, work, alcohol consumption, smoking, physical activity, and consumption of ultra-processed foods and culinary preparations, used in the adjusted analysis. : A total of 2339 adolescents (52.5% girls) were analyzed. The boys have a higher GS than the girls. In the adjusted analysis, with each increase of 1 kg/m in the FMI, GS was reduced by 0.72 kgf for boys and 0.35 kgf for girls. At each increase of 1 kg/m in the LBM, GS increased by 2.18 kgf for boys and 1.26 kgf for girls. : FMI was associated with lower GS regardless of the LBM. LBM was associated with higher GS regardless of the FMI.
: 瘦体重（LBM）和脂肪质量指数（FMI）与握力（GS）之间的相互作用在青少年中尚未在同一分析模型中进行探讨。因此，本研究旨在分析 FMI 和 LBM 与 GS 之间的关系。: 本横断面研究的数据来自圣路易斯 1997/98 年出生队列的 2016 年随访。握力通过 Jamar Plus + 测力计进行评估。LBM 和 FMI 指数通过[质量（瘦或脂肪-kg）与身高（m）的比值]进行评估。通过有向无环图（DAG）确定了同一分析模型中 FMI 和 LBM 与 GS 之间关系的混杂变量，包括性别、年龄、种族、工作、饮酒、吸烟、身体活动以及超加工食品和烹饪准备的消耗，用于调整后的分析。: 共分析了 2339 名青少年（52.5%为女孩）。男孩的 GS 高于女孩。在调整后的分析中，FMI 每增加 1kg/m，男孩的 GS 降低 0.72kgf，女孩降低 0.35kgf。LBM 每增加 1kg/m，男孩的 GS 增加 2.18kgf，女孩增加 1.26kgf。: FMI 与 GS 降低相关，而与 LBM 无关。LBM 与 GS 升高相关，而与 FMI 无关。
