polar cycling economy
Cycling Economy is expressed as the number of expended kilocalories per kilometer (or mile). Cycling economy is largely affected by the inclination of the terrain.
On flat terrain, cycling economy values are typically 20-30 kcal/km for bikers of average weight, whereas in 15% uphills, the value may rise above 150 kcal/km. Other factors play in, as well, such as air resistance - i.e. drafting, riding position - and rolling resistance, which is the result of the compression of the wheel, the ground or both.
Riding technique and the bicycle itself also impact cycling economy.