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Treadmill controllers

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  • Treadmill controllers

    I'm currently setting up my lab for functional studies of bird legs
    during terrestrial locomotion. I've adopted an "antique" treadmill that
    produces nasty noise within the frequency range of the EMG's I'm trying
    to record. Artifact amplitude increases with tread speed. I contacted
    the manufacturer (Landice) and was told that I needed a PWM (pulse width
    modulation) controller, which would put out a much higher frequency
    (15-20 kHz). They offered to install one into one of their top of the
    line treadmills, which ended up costing more than I'd like to pay, if
    I can avoid it.

    Controllers are a mystery to me. Does anyone have alternative solutions
    to controller noise? I'm particularly interested in hearing from folks
    recording EMG's on treadmills. My needs don't warrent making a treadmill
    from scratch, but I do need good performance at very low speeds.

    If this is a popular topic I'll post a summary. Thanks.

    Steve Gatesy
    Department of Biology
    Wake Forest University
    Winston-Salem, NC 27109