Commercial or passenger aircraft are usually designed for optimum performance at their cruise speed or VC. Combustion engines have an optimum efficiency level for fuel consumption and power output. Generally, piston engines are most efficient between idle speed and 25% short of full throttle.
The blood to your head rushes when you do a quick movement, so, naturally, dizziness is expected. I think the blood rushes from your head too fast. it is called postural hypotension.. whereby, due to getting up suddenly to a upright position, there is lower blood supply to th head.
Heart disease health centre. Exercise and low blood pressure. If you have low blood pressure, some precautions may be needed before exercising. Some people with low blood pressure experience no symptoms at all, while others might have a brief sensation of feeling dizzy when standing up too quickly.