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  • 1. Gullstrand, Lennart
    et al.
    Nilsson, Johnny
    Gymnastik- och idrottshögskolan, GIH, Laboratoriet för biomekanik och motorisk kontroll (BMC).
    A new method for recording the temporal pattern of stride during treadmill running2009In: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, no 11, p. 195-200Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to investigate the reliability of a new infrared light based method (IR40) for recording temporal stride patterns during treadmill running. The IR40 device, emitting a tight web of 40 infrared light beams 10 mm above the treadmill running surface, was compared to a previously validated electro-pneumatic contact shoe (CS) method while nine well-trained athletes ran at 2.8, 3.3, 3.9, 4.4, 5.0, and 5.6 m s−1. Disconnection and reconnection of the IR beams marked the stance phase. The sampling rate was 500 Hz for both methods. The stance phase duration was on average 11.5 (±8.4) ms longer with the IR40 than with the CS depending on earlier touch down (8.3 ± 6.2 ms) and delayed toe off (3.2 ± 5.3 ms) registrations. Significantly different stance phases were recorded between all velocities and for both methods. Thus, despite the fact that the IR40 systematically measured a somewhat longer stance phase duration than CS, the IR40 is nonetheless useful for temporal stride analysis during treadmill running.      

  • 2.
    Nilsson, Johnny
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science. Gymnastik- och idrottshögskolan, GIH, Laboratoriet för biomekanik och motorisk kontroll (BMC).
    Karlöf, Lars
    Jakobsen, Vidar
    A new device for measuring ski running surface force and pressure profiles2013In: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, Vol. 16, no 1, p. 55-59Article in journal (Refereed)
    Abstract [en]

    The pressure/force acting between the running surface of a ski and the snow may indirectly change glide friction. Thus, measuring the pressure/force distribution may be important for a deeper understanding of glide in skiing. The present aim was to construct a device that allowed the pressure/force underneath the ski running surface (SRS) to be recorded. Pressure sensors were attached on top of a platform. Sheets of different materials were used to improve the interaction between the SRS and the sensors. Possible functions of the device are demonstrated in three applications that emphasized comparison of force distribution underneath skis selected for similarity, force distribution under both skis and a single ski as well as backward weight distribution. The results show that the device with the pressure sensors mapped pressure/force distribution underneath the skis in the applications presented, and the system can thus be a useful tool for further optimizing e.g., ski designs.

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