This study examined the effects of accentuated eccentric loading (AEL) on bench press velocities across a spectrum of concentric and eccentric loads. Ten strength trained men (bench press one-repetition maximum (1-RM): 124.3 ± 19.4 kg; relative strength ratio: 1.5 ± 0.2 kg∙body mass⁻¹) participated. Subjects completed bench press repetitions using concentric loads from 30% to 80% 1-RM in 10% increments in each experimental session. The AEL protocols were implemented using 100% (AEL100) and 110% 1-RM (AEL110) loads during the eccentric action, while the eccentric load remained the same as the concentric for traditional loading (TRAD). Multilevel models analyzed the effects of each AEL protocol on concentric velocities across concentric loads (p < 0.05). Faster concentric velocities were observed at 30% 1-RM and 80% 1-RM with AEL100 compared to TRAD (p ≤ 0.05) but this effect was reduced for individuals moving the barbell through a greater displacement. Additionally, AEL110 presented a greater change in velocity from 30% to 80% 1-RM than TRAD (p ≤ 0.05). The AEL100 protocol resulted in faster concentric velocities throughout concentric loads of 30–80% 1-RM, but AEL110 may have been too great to elicit consistent performance enhancements. Thus, the efficacy of AEL at various concentric loads is dependent on the eccentric loading and barbell displacement.

中文翻译：

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卧推中的偏心加载：偏心和同心加载的注意事项

这项研究研究了在一系列同心和偏心载荷下，加重偏心载荷（AEL）对卧推速度的影响。十名受过力量训练的人（卧推一次最多（1-RM）：124.3±19.4 kg；相对力量比：1.5±0.2 kg∙体重^-1）参加了比赛。在每个实验阶段，受试者使用从30％到80％1-RM的同心载荷以10％的增量完成卧推重复。AEL协议是在偏心动作期间使用100％（AEL100）和110％1-RM（AEL110）负载实现的，而偏心负载与传统负载（TRAD）的同心负载相同。多级模型分析了每个AEL协议对同心载荷下同心速度的影响（p<0.05）。更快的在30％1-RM和80％1-RM与AEL100相比TRAD（观察同心速度p ≤0.05）但这种影响减小为个人通过一个更大的位移移动的杠铃。此外，AEL110呈现在速度变化较大从30％至80％1-RM比TRAD（p ≤0.05）。AEL100协议在30-80％1-RM的同心载荷下产生了更快的同心速度，但是AEL110可能太大了，无法引起持续的性能增强。因此，AEL在各种同心载荷下的功效取决于偏心载荷和杠铃位移。