The investigators will test the following central hypothesis that, compared to a control group, those treated with Comb-NMES for 6 weeks early after SCI will maintain a better whole-body metabolic profile, largely driven by maintenance of paralyzed muscle mass, fiber phenotype (maintenance of Type I and IIa fibers), and muscle oxidative metabolic function. The investigators will test this hypothesis in a controlled clinical trial of patients with SCI with the following specific aims: