“…Until now, examinations have mostly either dealt with the subjective aspects of tiredness in that they made use of rating scales [5,10,11,18], or they have concentrated on the objective physical aspect [8,9,26,30] or mental aspects of tiredness [3,14,19]. Relatively few studies have analysed both the objective performance and the subjective aspect of tiredness, either concentrating on the physical sphere [12,28,31] or on the mental sphere [1,15,17,25,30].…”