Lorist Monicque M, Kernell Daniel, Meijman Theo F, Zijdewind Inge
Department of Medical Physiology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS Groningen, The Netherlands.
J Physiol. 2002 Nov 15;545(1):313-9. doi: 10.1113/jphysiol.2002.027938.
During fatiguing submaximal contractions a constant force production can be obtained at the cost of an increasing central command intensity. Little is known about the interaction between the underlying central mechanisms driving motor behaviour and cognitive functions. To address this issue, subjects performed four tasks: an auditory choice reaction task (CRT), a CRT simultaneously with a fatiguing or a non-fatiguing submaximal muscle contraction task, and a fatiguing submaximal contraction task alone. Results showed that performance in the single-CRT condition was relatively stable. However, in the fatiguing dual-task condition, performance levels in the cognitive CRT deteriorated drastically with time-on-task. Moreover, in the fatiguing dual-task condition the rise in force variability was significantly larger than during the fatiguing submaximal contraction alone. Thus, our results indicate a mutual interaction between cognitive functions and the central mechanisms driving motor behaviour during fatigue. The precise nature of this interference, and at what level this interaction takes place is still unknown.
在疲劳性次最大收缩期间，可以通过增加中枢指令强度来维持恒定的力量输出。关于驱动运动行为的潜在中枢机制与认知功能之间的相互作用，目前所知甚少。为了解决这个问题，受试者进行了四项任务：听觉选择反应任务（CRT）、同时进行CRT与疲劳性或非疲劳性次最大肌肉收缩任务、单独进行疲劳性次最大收缩任务。结果表明，单CRT条件下的表现相对稳定。然而，在疲劳性双任务条件下，认知CRT的表现水平会随着任务时间的延长而急剧下降。此外，在疲劳性双任务条件下，力量变异性的增加明显大于单独进行疲劳性次最大收缩时。因此，我们的结果表明，在疲劳过程中，认知功能与驱动运动行为的中枢机制之间存在相互作用。这种干扰的确切性质以及这种相互作用发生的层面仍然未知。
