def vo2(velocity):
    """
    a regression equation relating VO2 with running velocity. Used in conjuction with the "velocity" equation to create the Jack Daniel's VDOT tables. Initially retrieved from "Oxygen Power: Performance Tables for Distance Runners" by Jack Daniels.


    Conditioning for Distance Running - the Scientific Aspects, 1978

    args:
        velocity (float): given in meters/second

    Returns:
        float: vO2, given in mL/kg/minute
    """
    return -4.6 + 0.182258 * velocity + 0.000104 * pow(velocity, 2)
