Esto es un ejemplo de un abstract mal redactado. Si un hipotetico estudiante mio me trajera algo asi, la armamos.Previous meta-analyses have compared the effects of single to multiple sets on strength, but analyses on muscle hypertrophy are lacking. The purpose of this study was to use multilevel meta-regression to compare the effects of single and multiple sets per exercise on muscle hypertrophy. The analysis comprised 55 effect sizes (ESs), nested within 19 treatment groups and 8 studies. Multiple sets were associated with a larger ES than a single set (difference = 0.10 +/- 0.04; confidence interval [CI]: 0.02, 0.19; p = 0.016). In a dose-response model, there was a trend for 2-3 sets per exercise to be associated with a greater ES than 1 set (difference = 0.09 +/- 0.05; CI: -0.02, 0.20; p = 0.09), and a trend for 4-6 sets per exercise to be associated with a greater ES than 1 set (difference = 0.20 +/- 0.11; CI: -0.04, 0.43; p = 0.096). Both of these trends were significant when considering permutation test p values (p < 0.01). There was no significant difference between 2-3 sets per exercise and 4-6 sets per exercise (difference = 0.10 +/- 0.10; CI: -0.09, 0.30; p = 0.29). There was a tendency for increasing ESs for an increasing number of sets (0.24 for 1 set, 0.34 for 2-3 sets, and 0.44 for 4-6 sets). Sensitivity analysis revealed no highly influential studies that affected the magnitude of the observed differences, but one study did slightly influence the level of significance and CI width. No evidence of publication bias was observed. In conclusion, multiple sets are associated with 40% greater hypertrophy-related ESs than 1 set, in both trained and untrained subjects.
Aqui se explica claramente que el rango de 2-3 series y 4-6 series consiguen mas hipertrofia. Claro, lo que no dicen es numero de repeticiones o rango de peso. Parece de cajon de madera de pino que a igual numero de peso y repeticiones, 2-6 series van a conseguir mas hipertrofia que una sola, porque si puedes hacer 6, el peso no sera tan proximo a tu 1RM. En mi interpretacion, esto favorece la carga sobre el peso para conseguir hipertrofia (que alguien me corrija).
Yo supongo que el peso varia, y lo que dice claramente es que si bien una sola serie es un 40% inferior a la hora de producir hipertrofia (en lo que llaman effect sizes, que no se lo que es), la diferencia entre 2 o 6 es nula.
Pero claro, sin acceso al articulo entero no se si hay control de dietas, rango de repeticiones... no se como de controlado se hizo el tema.

