1) This study examined the ability of human subjects to match a force in their quadriceps muscle during fatigue. Twenty subjects (mean age: 23.4 yrs, mean height: 167.8 cm, mean weight, 62.6 kg) were enrolled in the experiment. In the force-matching task, the quadriceps muscle generated 50% of the MVIC (maximum voluntary isometric contraction) torque under visual control and then without visual...

Interactive evolution, i.e. leveraging human input for selection in an evolutionary algorithm, is effective when an appropriate fitness function is hard to quantify yet solution quality is easily recognizable by humans. However, single-user applications of interactive evolution are limited by user fatigue: Humans become bored with monotonous evaluations. This paper explores the potential for by...

Leveraging human input for selection in an evolutionary algorithm, i.e. interactive evolution, is effective when an appropriate domain fitness function is hard to quantify, but where solution quality is easily recognizable by humans. However, single-user applications of interactive evolution are limited by user fatigue: Humans become bored with monotonous fitness evaluations. This paper shows t...

De Ruiter, C. J. and A. De Haan. Similar effects of cooling and fatigue on eccentric and concentric force-velocity relationships in human muscle. J Appl Physiol 90: 2109–2116, 2001.—The purpose of this study was to investigate the effects of muscle temperature and fatigue during stretch (eccentric) and shortening (concentric) contractions of the maximally electrically activated human adductor p...

The fracture of restored teeth is a significant obstacle to lifelong oral health. Recent studies suggest that fatigue cracks originate at flaws introduced during cavity preparation and that fatigue crack growth is a principle cause of restored tooth fractures. In this study, the rate of fatigue crack growth in bovine dentin was estimated under mode I cyclic loading. Double cantilever beam (DCB)...

conclusions the study findings highlight the importance of the mental aspect of fatigue in this working group. these results have possible implications for workers’ health and well-being and for the design of shift work systems, for industrial workers. background shift work is a well-recognized occupational health hazard in both industrialized and industrially developing countries. prolonged wo...

Virtual human simulation integrated into virtual reality applications is mainly used for virtual representation of the user in virtual environment or for interactions between the user and the virtual avatar for cognitive tasks. In this paper, in order to prevent musculoskeletal disorders, the integration of virtual human simulation and VR application is presented to facilitate physical ergonomi...

This paper provides an overview of an approach to developing computational models of fatigue, which has been used to develop detailed accounts of laboratory phenomena, and to make a priori predictions in more naturalistic tasks. The research has led to novel theories and mechanisms that help to build bridges between integrated theories of human cognition from cognitive science and theoretical a...

background: fatigue is one of the most common symptoms in primary care that adversely affects work, family life, and social relations. the purpose of this study was to survey the relationship between work schedule and fatigue among the emergency personnel of isfahan, iran using the checklist individual strength (cis) standard method in 2010. methods: this cross-sectional study was performed on ...