The pedal force effectiveness, an important parameter in cycling performance, is rarely optimal. Decreased power is generally observed during the recovery phase (the cyclist does not pull enough). An essential part of training for cyclists consists in improving pedaling technique. Visual feedback can be useful but may not be feasible in real life, where the cyclist has to visually focus on the road. We propose auditive feedback as a better way to help cyclists improve their pedal force effectiveness in real-time. In this study, both competitive cyclists and non-cyclists tested different online sonification strategies of force effectiveness, comparing them to a silent control. The ''Squeak'' strategy, generating a squeak when torque was negative, had the most positive impact on Torque Effectiveness: some participants managed to eliminate any negative torque for a full minute. INDEX TERMS Cycling ergometer, movement execution efficiency, torque effectiveness.

This paper deals with the design of transaural systems in usual rooms, whose response has a strong influence on sound reproduction. The paper proposes to select configurations for the best perceptual rendering. However, realistic perceptive experiments cannot deal with the many possible room and loudspeaker configurations. Therefore, the authors propose to assess them using objective scores that are extrapolated from the results of perceptive tests assessing a suitable selection of rooms and loudspeaker configurations. This extrapolation then allows comparison of a much larger set of combinations, leading to the conclusion that close-to-ears configurations allow reduction of the room influence, leading to a good perceived fidelityeven inside usual rooms. Closer loudspeakers are, however, likely to be more sensitive to listener position, so the robustness of loudspeaker configurations to listener misplacement were investigated. A suitable objective score, again based on a perceptive test, led to the surprising conclusion that some close-to-ears configurations are also robust to listener position.