School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia.
Scand J Med Sci Sports. 2023 Oct;33(10):1901-1915. doi: 10.1111/sms.14419. Epub 2023 Jun 2.
Since the 1970s, researchers have studied a potential difference in muscle fatigue (acute strength loss) between maximal eccentric (ECC ) and concentric (CON ) resistance exercise. However, a clear answer to whether such a difference exists has not been established. Therefore, the aim of our paper was to overview methods and results of studies that compared acute changes in muscle strength after bouts of ECC and CON resistance exercise. We identified 30 relevant studies. Participants were typically healthy men aged 20-40 years. Exercise usually consisted of 40-100 isokinetic ECC and CON repetitions of the knee extensors or elbow flexors. Both ECC and CON exercise caused significant strength loss, which plateaued and rarely exceeded 60% of baseline, suggesting strength preservation. In upper-body muscles, strength loss at the end of ECC (31.4 ± 20.4%) and CON (33.6 ± 17.5%) exercise was similar, whereas in lower-body muscles, strength loss was less after ECC (13.3 ± 12.2%) than CON (39.7 ± 13.3%) exercise. Muscle architecture and daily use of lower-body muscles likely protects lower-body muscles from strength loss during ECC exercise. We also reviewed seven studies on muscle fatigue during coupled ECC -CON exercise and found similar strength loss in the ECC and CON phases. We also found evidence from three studies that more ECC than CON repetitions can be completed at equal relative loads. These results indicate that muscle fatigue may manifest differently between ECC and CON resistance exercise. An implication of the results is that prescriptions of ECC resistance exercise for lower-body muscles should account for greater fatigue resilience of these muscles compared to upper-body muscles.
自 20 世纪 70 年代以来，研究人员研究了最大离心（ECC）和向心（CON）抗阻运动后肌肉疲劳（急性力量损失）的潜在差异。然而，是否存在这种差异的明确答案尚未确定。因此，我们的论文旨在综述比较 ECC 和 CON 抗阻运动后肌肉力量急性变化的研究方法和结果。我们确定了 30 项相关研究。参与者通常是年龄在 20-40 岁的健康男性。运动通常包括 40-100 次膝关节伸展或肘关节弯曲的等速 ECC 和 CON 重复。ECC 和 CON 运动都会导致显著的力量损失，力量损失达到平台期，很少超过基线的 60%，这表明力量得到了保留。在上肢肌肉中，ECC（31.4±20.4%）和 CON（33.6±17.5%）运动结束时的力量损失相似，而在下肢肌肉中，ECC（13.3±12.2%）运动后的力量损失小于 CON（39.7±13.3%）运动。肌肉结构和下肢肌肉的日常使用可能会保护下肢肌肉免受 ECC 运动中的力量损失。我们还综述了七项关于 ECC-CON 运动中肌肉疲劳的研究，发现 ECC 和 CON 阶段的力量损失相似。我们还从三项研究中发现证据表明，在相同的相对负荷下，可以完成更多的 ECC 重复而不是 CON 重复。这些结果表明，肌肉疲劳在 ECC 和 CON 抗阻运动之间可能表现不同。这些结果的一个含义是，对于下肢肌肉的 ECC 抗阻运动处方，应考虑到与上肢肌肉相比，这些肌肉的疲劳耐受力更强。
