This study examined the associations of moderate-to-vigorous intensity physical activity (MVPA) trajectories in adolescence through young adulthood with adiposity in young adults. Participants from The Iowa Bone Development Study cohort were longitudinally assessed (N = 297; 57% female). Accelerometry-measured MVPA (min/day) at ages 15 through 23 years, and fat mass and visceral adipose tissue mass indices (kg/m², g/m²) derived from dual-energy X-ray absorptiometry scans at age 23 years were analyzed. Latent trajectory analyses classified MVPA into two patterns. Multivariable linear regression analyses showed that being in the high MVPA trajectory group was associated with lower fat mass index z-scores. Individuals who were consistently active with high MVPA (vs. moderately active with decreasing MVPA) during adolescence up until early young adulthood had less accumulation of total body adiposity in young adulthood. This study suggests that adopting a consistently active lifestyle throughout adolescence can result in healthier body composition in young adulthood.

本研究探讨了青春期至成年早期的中等强度体力活动 (MVPA) 轨迹与年轻人肥胖之间的关系。来自爱荷华州骨骼发育研究队列的参与者接受了纵向评估（N = 297；57% 为女性）。15 至 23 岁时加速测量的 MVPA（分钟/天），以及23 岁时通过双能 X 射线吸收测量扫描得出的脂肪量和内脏脂肪组织质量指数（kg/m ²、g/m ² ）进行了分析。潜在轨迹分析将 MVPA 分为两种模式。多变量线性回归分析表明，处于高 MVPA 轨迹组与较低的脂肪质量指数 z 得分相关。在青春期直至成年早期持续进行高 MVPA 活动（相对于 MVPA 降低的中度活动）的个体，在成年早期全身肥胖的积累较少。这项研究表明，在整个青春期采取持续积极的生活方式可以使成年初期的身体成分更健康。