Let's talk about the sequence and principle of human energy consumption. If you understand, you won't have this kind of worry.
The process and sequence of human energy consumption are as follows
1. creatine phosphate system (ATP-CP system) 2. Carbohydrate (sugar in the body) 3. Fat 4 protein. ..
When you exercise with all your strength, the ATP-CP system is activated first. The highest efficiency but short duration, about 6-8 seconds (sprint weightlifting).
2. glycolysis uses glycogen in the body to supply energy and can last for several hours.
3. After 20 minutes of exercise, the body begins to use fat for energy supply. Fat is the biggest energy pool of human body. 1 g fat can produce 9 kilocalories ... 1 kg fat has 9,000 kilocalories.
4. protein provides energy ... that is, the muscles you are most worried about are digested. The premise of this situation is that if you do high-intensity exercise for more than 90 minutes, your muscle glycogen will be exhausted, and your body will not be able to oxidize fat to supply energy (sugar is the detonator for burning fat, so you can't use fat without enough sugar), and your body will start to decompose protein in muscles to supply energy.
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I hope you can see clearly. I want to say that if you don't get tired at a certain speed like a professional athlete, then your muscles must be safe. If you pay attention to sugar supplementation (drinking Gatorade and other sports drinks), you don't have to worry that exercise will consume muscles. After all, people in a team have good and bad physical qualities, so they don't ride too hard to take care of the poor ones, do they? Therefore, as long as you don't reach a very large amount of exercise (not the distance, but the continuous intensity and heart rate), the protein in the muscle will not decompose.