def stairmaster_mets(setting):
    """
    For use in submaximal tests on the StairMaster 4000 PT step ergometer.

    Howley, Edward T., Dennis L. Colacino, and Thomas C. Swensen. "Factors Affecting the Oxygen Cost of Stepping on an Electronic Stepping Ergometer." Medicine & Science in Sports & Exercise 24.9 (1992): n. pag. NCBI. Web. 10 Nov. 2016.

    args:
        setting (int): the setting of the step ergometer

    Returns:
        float: VO2:subscript:`2max` in kcal/kg*hour
    """
    return 0.556 * 7.45 * setting