1, the thermal conductivity of water is 26 times greater than that of air, and the heat dissipation in water is more than 20 times faster than that in air at the same temperature. This will effectively consume human body heat.
2. Sports physiologists' tests show that swimming in water 100 meters consumes 100 calories, which is equivalent to running 400 meters on land, riding a bike 1000 meters, or skating 1500 meters.
Extended data:
Heat is an indispensable fuel for human body.
Calorie is the transliteration of French Calorie, which is the unit for calculating calories, and it is divided into big card and small card. 1 calorie is equivalent to the heat used to raise 1 liter of water to 1 degree Celsius at 1 standard atmospheric pressure; 1 calorie equals 1000 calories.
All the calories our body needs come from food. When eating, the chemical action of human metabolism decomposes food and converts it into energy. Daily activities, from breathing to running a marathon, are driven by burning calories.
Combustion heat is one of the metabolic processes. If the body needs enough oxygen, water and food, cells will work actively to burn calories at the best speed. Therefore, a healthy diet, good digestion, proper minerals and vitamins and regular exercise are indispensable.
If nutrition is insufficient, the efficiency of metabolism will be reduced, which will slow down the work of cells and greatly reduce the speed of burning calories. "Unused" calories will accumulate to form fat and gain weight.
There are three kinds of calories in food.
There are three kinds of calories in food: protein's calories are the basic nutrients to strengthen muscles, mainly from meat, dairy products and eggs, with 4 calories per gram; Carbohydrate calories are the main energy source of human body under normal circumstances, which are contained in rice, flour, noodles, bread, cereals, vegetables and fruits, and each gram of calories is also 4 calories; Fat contains 9 calories per gram, which is found in both oil and cream.
There is also a kind of heat called "deficiency heat", which refers to those foods that only provide energy but have low nutritional value, such as cold drinks, alcohol and fast food.
The ideal calorie ratio of each meal is probably: carbohydrate 65%, fat 20%, protein 15%.
Irving Wooler is an American biochemist and nutrition expert who has written more than 20 professional books. He said that the best calorie ratio varies from person to person, and the general principle is that carbohydrates should not be too much or too little, and fat and protein should not be completely shut out.
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