PURPOSE The aim of this study was to compare the concentration of blood lactate [bLa-] and the subjective perception of exertion of trained men in a moderate repetition protocol (MRP) versus a high repetition protocol (HRP) equated for time under tension. METHODS A sample of 40 healthy young men (aged, 23.2 ± 4.0 years; height, 177.3 ± 7.0 cm; BMI, 24.3 ± 2.2) performed two sessions of 8 sets of bicep curls with a one-week recovery interval between the trials. In the HRP protocol, 20 repetitions were performed with a cadence of 2 seconds of eccentric and 1 second of concentric, while in the MRP protocol 10 repetitions were performed with 4 seconds of eccentric and 2 seconds of concentric. Cadences were controlled by a metronome. At the beginning and end of each of the sessions, blood lactate was taken at 2, 15, and 30 minutes, and rating of perceived exertion (OMNI-RES) was assessed immediately after completion of each session. RESULTS There were [bLa-] differences between protocols in the MRP 2 min, (5.2 ±1.4); 15 min, (3.2 ±1.2); 30 min, (1.9 ±0.6); p< 0.05, and the HRP 2 min, (6.1 ±1.6); 15 min, (3.7 ±1.1); 30 min, (2.2 ±0.6); p<0.01. OMNI-RES was higher in HRP, (8.8 ±0.7) than in MRP, (7.7 ±0.9). Additionally, a correlation was found between the RPE and [bLa-] values in the HRP protocol (rs = 0.35, p < 0.01). CONCLUSIONS Training protocols with high times under tension promote substantial increases in metabolic stress, however, our findings indicate that HRP generates more [bLa-] than MRP. In addition, there were higher RPE values in the HRP protocol compared to MRP in single-joint exercises.

中文翻译：

---

两种匹配的紧张时间下方案中血液乳酸和感觉到的运动反应的比较。

目的这项研究的目的是比较中度重复协议（MRP）与高重复协议（HRP）等同于紧张状态下时间的血液乳酸浓度[bLa-]和受过训练的男性的主观感觉。方法对40名健康的年轻男性（年龄为23.2±4.0岁；身高为177.3±7.0 cm； BMI为24.3±2.2）进行抽样，共进行了2次，每组8组的二头肌curl曲，两次试验之间的恢复间隔为一周。在HRP协议中，以2秒的离心率和1秒的同心度进行20次重复，而在MRP协议中，以4秒的离心率和2秒的同心度进行10次重复。节拍由节拍器控制。在每个疗程的开始和结束时，分别在2、15和30分钟采血乳酸，每节课结束后立即评估感觉劳累等级（OMNI-RES）。结果在MRP 2分钟内，方案之间存在[bLa-]差异，（5.2±1.4）；15分钟，（3.2±1.2）；30分钟，（1.9±0.6）；p <0.05，HRP 2分钟，（6.1±1.6）；15分钟，（3.7±1.1）；30分钟，（2.2±0.6）；p ＜0.01。HRP的OMNI-RES较高（8.8±0.7），高于MRP的（7.7±0.9）。另外，在HRP协议中发现RPE和[bLa-]值之间存在相关性（rs = 0.35，p <0.01）。结论在紧张状态下进行长时间训练可以促进代谢应激的显着增加，但是，我们的发现表明，HRP比MRP产生更多的[bLa-]。此外，与单关节练习中的MRP相比，HRP协议中的RPE值更高。