Papers by Jean-Marie Aerts
Monitoring the training of athletes is essential for success in sports. Information that is deriv... more Monitoring the training of athletes is essential for success in sports. Information that is derived from measured data during the training is only reliable if the quality of the data is high. Therefore artefact detection and removal are essential. In this paper typical artefacts in heart rate measurements during football field-trainings are described. An algorithm to automatically detect artefacts and an algorithm to pre-process them are also presented. The results show that with the proposed pre-processing method the percentage of artefacts can be significantly (p < 0.01) reduced from 9.0 to 4.4 %. This corresponds to a total period of 10 hours of unreliable data on a total of 126 hours that have been taken out. As a result, more high quality data is available for monitoring training. The developed methods are generic and can be used in many applications where accurate heart rate monitoring is crucial.
Bookmarks Related papers MentionsView impact
Car racing at a high level is a physically and mentally intensive sport. Despite the fact that a ... more Car racing at a high level is a physically and mentally intensive sport. Despite the fact that a large number of variables are measured on the car during racing, nothing is measured on the driver. It is well known that to achieve peak performance in competitive sports it is important that the athlete is at their peak both physically and mentally. The objective of this work is to monitor the mental state of the driver in real-time and provide this information to the pit crew. A number of interesting cases are presented that show the potential of real-time stress monitoring in race car driving as a means for driver performance optimisation and as a means to reduce accidents.
Bookmarks Related papers MentionsView impact
Extreme Physiology & Medicine, 2015
Bookmarks Related papers MentionsView impact
International Journal of Industrial Ergonomics, 2015
Bookmarks Related papers MentionsView impact
Extreme Physiology & Medicine, 2015
Bookmarks Related papers MentionsView impact
European Journal of Applied Physiology, 2008
This research aims at quantifying spatial gradients in skin temperature and sweat production unde... more This research aims at quantifying spatial gradients in skin temperature and sweat production under a bicycle helmet. Distribution of sweat production, skin temperature and air temperature was measured at different positions under a bicycle helmet on five male and four female test persons. Effort level was 100 and 150 watt for men (low and high effort level) and 80 and 120 W for women (low and high effort level). Skin temperatures were found to be spatially different (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05): frontal and lateral region varied 4.6 degrees C at low effort level and 5.3 degrees C at high effort level. Sweat production was found to be not significantly different (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; 0.05). Finally, air temperature variations were found to be spatially different (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05). Average air temperature differed 2.3 degrees C between lateral and frontal region at high effort level and 2.7 degrees C at low effort level. The results of this research can be used to help designing helmets with better thermal comfort.
Bookmarks Related papers MentionsView impact
Extreme Physiology & Medicine, 2015
Bookmarks Related papers MentionsView impact
International Journal of Industrial Ergonomics, 2010
Bookmarks Related papers MentionsView impact
International Journal of Industrial Ergonomics, 2012
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
European Journal of Applied Physiology, Jul 23, 2008
This research aims at quantifying spatial gradients in skin temperature and sweat production unde... more This research aims at quantifying spatial gradients in skin temperature and sweat production under a bicycle helmet. Distribution of sweat production, skin temperature and air temperature was measured at different positions under a bicycle helmet on five male and four female test persons. Effort level was 100 and 150 watt for men (low and high effort level) and 80 and 120 W for women (low and high effort level). Skin temperatures were found to be spatially different (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05): frontal and lateral region varied 4.6 degrees C at low effort level and 5.3 degrees C at high effort level. Sweat production was found to be not significantly different (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; 0.05). Finally, air temperature variations were found to be spatially different (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05). Average air temperature differed 2.3 degrees C between lateral and frontal region at high effort level and 2.7 degrees C at low effort level. The results of this research can be used to help designing helmets with better thermal comfort.
Bookmarks Related papers MentionsView impact
Applied Ergonomics, 2008
Bookmarks Related papers MentionsView impact
Scientific reports, 2014
When a rat is on a limited fixed-time food schedule with full access to a running wheel (activity... more When a rat is on a limited fixed-time food schedule with full access to a running wheel (activity-based anorexia model, ABA), its activity level will increase hours prior to the feeding period. This activity, called food-anticipatory activity (FAA), is a hypothesized parallel to the hyperactivity symptom in human anorexia nervosa. To investigate in depth the characteristics of FAA, we retrospectively analyzed the level of FAA and activities during other periods in ABA rats. To our surprise, rats with the most body weight loss have the lowest level of FAA, which contradicts the previously established link between FAA and the severity of ABA symptoms. On the contrary, our study shows that postprandial activities are more directly related to weight loss. We conclude that FAA alone may not be sufficient to reflect model severity, and activities during other periods may be of potential value in studies using ABA model.
Bookmarks Related papers MentionsView impact
Building and Environment, 2005
Bookmarks Related papers MentionsView impact
Lyme disease and Hanta virus infection are the result of the conjunction of several climatic and ... more Lyme disease and Hanta virus infection are the result of the conjunction of several climatic and ecological conditions. Although both affections have different causal agents, they share an important characteristic which is the fact that rodents play an important role in the contagion. One of the most important agents in the dispersion of these diseases is the bank vole (Clethrionomys
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Nevertheless the proven benefit of a cyclist helmet in preventing serious head injuries when a cr... more Nevertheless the proven benefit of a cyclist helmet in preventing serious head injuries when a crash occurs, many cyclist still refuse to wear a crash helmet. The main reason for not wearing a cyclist helmet is the sensation of discomfort encountered when wearing one. This paper ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
2005 Tampa, FL July 17-20, 2005, 2005
ABSTRACT Especially in hot climate, heat stress decreases feed intake and performance of animals ... more ABSTRACT Especially in hot climate, heat stress decreases feed intake and performance of animals and leads to an increased mortality. Evaporation of water to the ambient air is generally a cost effective solution to alleviate heat stress, but is also critically discussed due to its effect on indoor humidity. The impact of a high pressure fogging system on ventilation, temperature reduction, indoor humidity, water consumption, and evaporation efficiency was investigated in a research facility for fattening pigs during a total of four fattening periods. Measured reductions of the indoor temperature ranged up to 7°C, ventilation rate was reduced by about 22 %, and water consumption averaged on 4 to 5 liters per pig per day at mean daily outside temperatures above 14°C. Performance of the animals was reduced during hot periods when no cooling was used, but were in general compensated afterwards. Evaporation efficiency for a fixed pressure (7 MPa) did depend mainly on temperature and saturation deficit and was 67 % for cold and wet indoor conditions (13°C; 83 % r. h.) and up to 100 % for indoor temperatures around 28°C. To simulate the effect of the cooling system at different outside conditions, a data-based model was created and used as sub-model part in an established dynamic simulation model. The comparison of indoor temperature-humidity profiles, as well as the consideration of water and energy consumption enabled general recommendations for the settings of ventilation and fogging control, like a reduced maximum ventilation rate combined with shifting the fogging start. Pulse cycles instead of continuously fogging featured minor advantages compared to other changes of settings. An adequate control of a fogging system is generally recommended but depends on the specific outside and facility characteristics.
Bookmarks Related papers MentionsView impact
Uploads
Papers by Jean-Marie Aerts