/**
* Guess heart rate
* @param float $distance
* @param int $seconds
* @return float
*/
protected function guessHR($distance, $seconds)
{
if (self::$VDOTshape <= 0 || $seconds == 0) {
return 0.5;
}
$Shape = new VDOT(self::$VDOTshape);
$speed = 60 * 1000 * $distance / $seconds;
$hr = VDOT::HRat($speed / $Shape->speed());
return $hr;
}
