http://www.runnersworld.com/sweat-science/should-your-doctor-check-your-vo2-max?utm_source=facebook.com&utm_medium=Social&utm_term=693816002&utm_campaign=Runner%E2%80%99s%20World
it's very dependant on Physical Activity but my calculated VO2Max comes out in line with the 735's prediction if I put intensity to a 10.
CW
[Edit] they should have included some brackets in the formula it's 100.27 + (0.226 * PA) – (0.296 * A) –(0.369 * WC) – (0.155 * HR).