Freude G, Ullsperger P
Eur J Appl Physiol Occup Physiol. 1987;56(1):105-8. doi: 10.1007/BF00696384.
This study investigates the electroencephalographic Bereitschaftspotential (Bp) during muscular-fatiguing and non-fatiguing rhythmical hand contractions at 20%, 50%, and 80% maximum voluntary contraction (MVC). A feedback arrangement was provided so that subjects were able to adjust the force as required. The results confirm that Bp depends on force level. An increase in force results in a Bp increase. Further, they show that muscular-fatiguing contractions at 80% MVC are accompanied by an increased Bp. This could be the result of an increase in the central nervous activation required when preparing for motor activity with fatigued muscles. A decrease in Bp was observed during non-fatiguing repetitive hand contractions at 50% MVC. Possibly, the decrease reflects a decrease in subjects intentional involvement due to the monotony of the exercise. Repetitive movements at 20% MVC, which require a high degree of concentration and attention to adjust exactly to this very small force level, also result in an increased Bp, perhaps due to the higher intentional involvement. It may be concluded that the influence of muscular fatigue on Bp should be investigated with consideration of the psychological aspects of repetitive movements.
本研究调查了在最大自主收缩（MVC）的20%、50%和80%时，肌肉疲劳和非疲劳的节律性手部收缩过程中的脑电图 Bereitschaftspotential（Bp）。提供了一种反馈装置，以便受试者能够根据需要调整力量。结果证实，Bp取决于力量水平。力量增加会导致Bp增加。此外，结果表明，在80%MVC时的肌肉疲劳收缩伴随着Bp增加。这可能是在用疲劳肌肉准备运动活动时，所需的中枢神经激活增加的结果。在50%MVC的非疲劳重复性手部收缩过程中观察到Bp下降。可能是这种下降反映了由于运动的单调性，受试者有意参与度的降低。在20%MVC时的重复性运动，需要高度集中注意力并精确调整到这个非常小的力量水平，也会导致Bp增加，这可能是由于更高的有意参与度。可以得出结论，应该在考虑重复性运动心理因素的情况下，研究肌肉疲劳对Bp的影响。
