PURPOSE This study investigated the effect of progressively adding sets for the lower limb every 2 wk versus performing a constant set volume in resistance-trained males. METHODS Thirty-one resistance-trained males (age = 24.4 ± 2.9 yr, height = 175.5 ± 6.5 cm, body mass = 80.1 ± 9.4 kg, body fat = 14.4% ± 3.1%, resistance training [RT] experience = 5.1 ± 2.2 yr; one-repetition maximum [1RM] barbell back squat: body mass ratio = 1.7 ± 0.1 a.u.) were randomly allocated into a constant group (CG, n = 10), a four-set progression group (4SG, n = 10) or a six-set progression group (6SG, n = 11). After a 2-wk washout period and another 2-wk familiarization period, participants performed a lower-limb training program twice a week for 12 wk. Maximum dynamic strength (1RM) in the barbell back squat, vastus lateralis cross-sectional area, and the sum of lateral thigh muscle thickness at 30%, 50%, and 70% of the femur length were assessed at baseline and after the 12-wk training program. RESULTS Regarding 1RM, multiple comparisons revealed that 6SG elicited higher muscle strength gains than 4SG ( P = 0.002) and CG ( P < 0.0001), and 4SG had greater improvements than CG ( P = 0.023). Cross-sectional area and sum of lateral thigh muscle thickness showed no between-group differences ( P = 0.067 and P = 0.076, respectively). However, an inspection of 95% confidence intervals suggests a potential dose-response relationship, with results appearing to plateau in the higher volume conditions. CONCLUSIONS Our results suggest that progressively adding four or six sets per week every 2 wk elicited greater lower-limb strength in resistance-trained individuals over a 12-wk training period. Although our findings indicate a possible small benefit for higher volume conditions regarding hypertrophic adaptations in this population, the limited certainty of our findings warrants caution.

中文翻译：

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不同的每周组数进展对受过训练的男性肌肉适应的影响：是否存在剂量反应效应？


目的 本研究调查了对于接受阻力训练的男性，每两周逐渐增加下肢组数与执行恒定组数的效果。方法 31 名接受阻力训练的男性（年龄 = 24.4 ± 2.9 岁，身高 = 175.5 ± 6.5 cm，体重 = 80.1 ± 9.4 kg，体脂 = 14.4% ± 3.1%，阻力训练 [RT] 经验 = 5.1 ± 2.2年；一次重复最大 [1RM] 杠铃后深蹲：体重比 = 1.7 ± 0.1 au）被随机分配到恒定组（CG，n = 10）和四组进展组（4SG，n = 10）或六组进展组（6SG，n = 11）。经过 2 周的冲洗期和另外 2 周的熟悉期后，参与者每周进行两次下肢训练计划，持续 12 周。在基线和 12 次训练后评估杠铃后蹲的最大动态力量 (1RM)、股外侧肌横截面积以及股骨长度 30%、50% 和 70% 处的大腿外侧肌肉厚度总和。每周培训计划。结果关于1RM，多重比较显示6SG比4SG（P=0.002）和CG（P<0.0001）引起更高的肌肉力量增益，并且4SG比CG有更大的改善（P=0.023）。横截面积和大腿外侧肌肉厚度总和没有显示组间差异（分别为 P = 0.067 和 P = 0.076）。然而，对 95% 置信区间的检查表明存在潜在的剂量反应关系，结果在较高体积条件下似乎趋于稳定。结论 我们的结果表明，在 12 周的训练期间，每 2 周每周逐渐增加 4 到 6 组，可以使接受阻力训练的人获得更大的下肢力量。 尽管我们的研究结果表明，对于该人群的肥大适应而言，较大体积的条件可能会带来一些小好处，但我们的研究结果的有限确定性值得谨慎对待。