The main issue is body composition (see the body fat calculator for more). Calorie expenditure will vary depending on the ratio of body fat to muscle or lean mass. NOTE that as our bodies adapt to exercise and our body composition changes - so will the amount of Calories burned.
The definition of a throttle is a valve that controls the fluid flow. An example of a throttle is a car part that controls how fuel moves through the system. Throttle is defined as to control the speed of an engine or the flow of fuel in an engine, or to hold down or choke.
The function of the throttle is to regulate RPM. If the collective pitch-throttle synchronization unit does not automatically maintain a constant RPM when a change is made in the collective pitch stick position, the throttle may be moved manually with the twist grip to make further adjustments of engine RPM.