Figure 2.

Dose–response relationship between total protein intake and change in lean body mass in each group. Spline curves illustrating the associations between total protein intake and change in lean body mass in each group in an unadjusted model (a, b, and c for all trials, trials with resistance training, and trials without resistance training, respectively), in multivariate-adjusted model 1 (d, e, and f for all trials, trials with resistance training, and trials without resistance training, respectively), or multivariate-adjusted model 2 (g, h, and i for all trials, trials with resistance training, and trials without resistance training, respectively). The solid line and dashed line represent the mean change in LBM and 95%CIs, respectively. Covariates of multivariate-adjusted model 1 are age, sex, intervention period, and resistance training. Covariates of multivariate-adjusted model 2 are weight change in addition to the covariates of multivariate-adjusted model 1. Abbreviations: BW, body weight; FFM, fat-free mass; LBM, lean body mass.