Suppose a person weighing 60 kilograms lives on the fifth floor. If each floor is 4 meters high (vertical height from the ground), the muscle should do 60×4 = 240 kg of work on each floor and 240×5 = 1200 kg of work on five floors.
When human muscles contract, the mechanical efficiency is very low, only about 20% has done work (for example, lifting or moving the body for a certain distance), and the remaining 80% energy is all converted into heat energy and released in the form of body temperature. 1200 kg of rice must be divided by the mechanical efficiency of 20%, so the workload of going upstairs is: 60× 4× 5 ÷ 20% = 60.
The workload of going downstairs is about 1/3 of going upstairs, so the workload of going downstairs is: 6000÷3 = 2000kg·m m, and the sum of going upstairs and going downstairs is: 6000+2000 = 8000kg·m m, because the work consumption per 428kg·m is 4.184 kj.
Therefore, when the workload is converted into the energy card price, the energy consumption of going up and down the stairs once can be obtained by dividing the workload by 428: 8000 ÷ 428× 4.184 = 78.2 kj.
Extended data:
Precautions:
1. After climbing the stairs, always do squats, stand up and sit still. These exercises can fully exercise the knee joint, prevent it from being stiff and stiff, and can well reduce the side effects caused by climbing stairs.
2, climb the stairs to guard against physical discomfort. If the user has chest tightness, palpitation accompanied by sweating, and joint pain during exercise, he should immediately stop climbing stairs.
3, climbing stairs should choose the appropriate ladder height. Generally speaking, the ladder height of 14- 15 cm is more suitable for users to climb, so you may wish to pay attention to it during normal exercise.
4. When you just climb the stairs, you can skillfully use the walking guardrail. Just now; The coordination and rhythm of MM body climbing stairs may not be in place. At this time, it is advisable to use the guardrail for auxiliary exercise and master the skills before leaving the guardrail.
Baidu encyclopedia-climbing stairs
Baidu encyclopedia-energy consumption