Generate calories burned from HR data

[fiddur]

For activities where HR is logged, make an option to recalculate the energy expenditure based on heartrate an VO2 max.

Using the formulas from this page: https://www.omnicalculator.com/sports/calories-burned-by-heart-rate

Women:

CB = T × (0.45×H + 0.380×V + 0.103×W + 0.274×A - 59.3954) / 4.184

Men:

CB = T × (0.634×H + 0.404×V + 0.394×W + 0.271×A - 95.7735) / 4.184

where:

    CB – Number of calories burned;
    T – Duration of exercise in minutes;
    H – Your average heart rate in beats per minute;
    V – Your maximum rate of oxygen consumption, VO2 max, in ml/kg/min;
    W – Your weight in kilograms; and
    A – Your age in years.