Larson Dennis J, Brown Stephen H M
Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
Hum Mov Sci. 2018 Feb;57:13-20. doi: 10.1016/j.humov.2017.10.019. Epub 2017 Nov 7.
The purpose of this study was to induce both trunk extensor and abdominal muscle fatigue, on separate occasions, and compare their effects on standing postural control and trunk proprioception, as well as look at the effects of a recovery period on these outcome measures. A total of 20 individuals participated, with 10 (5 males and 5 females) completing either a standing postural control or lumbar axial repositioning protocol. Participants completed their randomly assigned protocol on two occasions, separated by at least 4 days, with either their trunk extensor or abdominal muscles being fatigued on either day. Postural control centre of pressure variables and trunk proprioception errors were compared pre- and post-fatigue. Results showed that both trunk extensor and abdominal muscle fatigue significantly degraded standing postural control immediately post-fatigue, with recovery occurring within 2 min post-fatigue. In general, these degradative effects on postural control appeared to be greater when the trunk extensor muscles were fatigued compared to the abdominal muscles. No statistically significant changes in trunk proprioception were found after either fatigue protocol. The present findings demonstrate our body's ability to quickly adapt and reweight somatosensory information to maintain postural control and trunk proprioception, as well as illustrate the importance of considering the abdominal muscles, along with the trunk extensor muscles, when considering the impact of fatigue on trunk movement and postural control.
本研究的目的是在不同时间分别诱发躯干伸肌和腹肌疲劳，并比较它们对站立姿势控制和躯干本体感觉的影响，同时观察恢复期对这些结果指标的影响。共有20名参与者，其中10名（5名男性和5名女性）完成了站立姿势控制或腰椎轴向重新定位方案。参与者在两个不同的时间完成他们随机分配的方案，间隔至少4天，在其中一天使他们的躯干伸肌或腹肌疲劳。比较疲劳前后的姿势控制压力中心变量和躯干本体感觉误差。结果表明，躯干伸肌和腹肌疲劳在疲劳后立即显著降低了站立姿势控制能力，在疲劳后2分钟内恢复。一般来说，与腹肌相比，当躯干伸肌疲劳时，对姿势控制的这些降解作用似乎更大。在任何一种疲劳方案后，躯干本体感觉均未发现统计学上的显著变化。本研究结果表明，我们的身体能够快速适应并重新加权体感信息以维持姿势控制和躯干本体感觉，同时也说明了在考虑疲劳对躯干运动和姿势控制的影响时，除了躯干伸肌外，还要考虑腹肌的重要性。
