Blitz P S, Van Moorst A
Percept Mot Skills. 1978 Jun;46(3 Pt 1):779-90. doi: 10.2466/pms.1978.46.3.779.
Workload is an important factor related to perception of physical fatigue. Because a person engaged in physical activity eventually leading to painful exhaustion is in a pay-off situation, the paradigm of signal detection might be applicable to the perception of differences in load. Two male track and field athletes, aged 22 and 24 yr., participated in two experiments. In Exp. 1 difference threshold were determined with 25%, 50%, 60%, 65% and 70% of VO2 max as basic loads on a bicycle ergometer. Results showed a decreasing k over increasing work loads, contrary to Weber's law. In Exp. 2 a non-parametric signal detection procedure was used, with 25%, 40%, 50% and 60% of VO2 max as noise levels and a signal intensity of 1.5 watt in every condition. A chi 2 test for a 2-factor design showed only an effect of noise level. The converging results of both experiments led to the conclusion of a relative increasing sensitivity across increasing work loads. The main goal for future research will be to develop the signal detection method as a framework for research on fatigue.
工作量是与身体疲劳感知相关的一个重要因素。由于从事体力活动最终导致痛苦性疲惫的人处于一种有回报的情境中，信号检测范式可能适用于对负荷差异的感知。两名年龄分别为22岁和24岁的男性田径运动员参与了两项实验。在实验1中，以最大摄氧量的25%、50%、60%、65%和70%作为自行车测力计上的基本负荷来确定差异阈值。结果显示，与韦伯定律相反，随着工作量增加，k值减小。在实验2中，使用了非参数信号检测程序，以最大摄氧量的25%、40%、50%和60%作为噪声水平，且在每种情况下信号强度为1.5瓦。对二因素设计的卡方检验仅显示出噪声水平的影响。两项实验的趋同结果得出结论：随着工作量增加，敏感性相对提高。未来研究的主要目标将是把信号检测方法发展成为疲劳研究的一个框架。
