Hjortskov N, Essendrop M, Skotte J, Fallentin N
National Institute of Occupational Health, Department of Physiology, Copenhagen, Denmark.
Scand J Med Sci Sports. 2005 Dec;15(6):409-15. doi: 10.1111/j.1600-0838.2004.00438.x.
The aim of the study was to investigate the effect of moderate delayed-onset muscle soreness (DOMS) on the short latency stretch reflex (SLR) and long latency stretch reflex (LLR) response i.e. electromyographic (EMG) onset latencies and EMG amplitudes in erector spinae (ES). Nine males with muscle soreness (DOMS group) were tested 24, 48 h, and 7 days post-exercise. Eight males (control group) were tested likewise. EMG was measured from ES bilaterally at the level of L3/L4. The SLR was elicited by mechanically tapping the ES at L3/L4, and the LLR was elicited by sudden loadings of the spine. Significant reductions in force during maximal voluntary contractions and range of motion, and a significant increase in muscle soreness (measured by pressure algometry) and subjective experience of soreness in the low back indicated DOMS 24, and 48 h post-exercise in the DOMS group. No changes were observed in the control group. The SLR and LLR response were unaffected by DOMS, i.e. no changes in EMG latencies and amplitudes were observed. In conclusion, despite changes in DOMS indicators, the reflex system protecting the stability of the lumbar spine is apparently capable of maintaining an appropriate triggering of SLR and LLR.
本研究的目的是调查中度延迟性肌肉酸痛（DOMS）对短潜伏期牵张反射（SLR）和长潜伏期牵张反射（LLR）反应的影响，即竖脊肌（ES）的肌电图（EMG）起始潜伏期和EMG振幅。对9名有肌肉酸痛的男性（DOMS组）在运动后24小时、48小时和7天进行测试。同样对8名男性（对照组）进行测试。在L3/L4水平双侧测量竖脊肌的肌电图。通过机械轻敲L3/L4水平的竖脊肌引出短潜伏期牵张反射，通过脊柱突然加载引出长潜伏期牵张反射。DOMS组在运动后24小时和48小时，最大自主收缩时的力量和活动范围显著降低，肌肉酸痛（通过压力痛觉测定法测量）和下背部酸痛的主观体验显著增加。对照组未观察到变化。短潜伏期牵张反射和长潜伏期牵张反射反应不受DOMS影响，即未观察到肌电图潜伏期和振幅的变化。总之，尽管延迟性肌肉酸痛指标发生了变化，但保护腰椎稳定性的反射系统显然能够维持短潜伏期牵张反射和长潜伏期牵张反射的适当触发。
