
<!-- Function:  Calcul vo2 max  -->

<!-- Required by: vo2race.htm -->


function vo2maxcalculate()

{
  var units = document.vo2max.units.options[document.vo2max.units.selectedIndex].value;
  var hrs = eval(document.vo2max.hrs.value);
  var mins = eval(document.vo2max.mins.value);
  var secs = eval(document.vo2max.secs.value);
  var dist = eval(document.vo2max.dist.value);

  if (units == 'miles')
    {
      dist = dist * 1.609;
    }

  //convert time to mins and 100ths of mins
  th = hrs*60;
  tm = mins * 1;
  ts = secs /60;
  time = th+tm+ts;

  //calculate velocity im metres per min
  d=eval(dist*1000/time);

  //calculate % max
  p=0.8+(0.1894393*Math.exp(-0.012778*time))+(0.2989558*Math.exp(-0.1932605*time));

  //calculate vo2
  v=-4.60+(0.182258*d)+(0.000104*d*d);

  //calculate vo2 max
  vo2=v/p;

  document.vo2max.vo2.value = vo2;
}
 

function vo2clear()

{
  document.vo2max.vo2.value = "";
  document.vo2max.hrs.value= "0";
  document.vo2max.secs.value= "0";
  document.vo2max.mins.value= "0";
}