This September I swam more in a pool then in the ocean! Having a month-ticket to a nice neighboring pool makes it easier, and there was too much seaweed along the coast this year after the first hot weeks of Fall.
In the pool I used to make around 60 short lengths (25 yards) first, but then my friend pro-swimmer suggested I should do 66 (one mile, or 1650 yards, or 1.5 kilometres), and I switch to a swimmer's mile a day. I turn like I do in open waters, barely touching the walls and it takes me the whole 45 minutes of non-stop breaststroke to finish :) You may laugh about it, but for somebody whose main sport in youth was piano I am doing pretty nicely.
I am looking forward to double the distance if I have a chance to continue in this open air heated pool (~80F) for months, but I am not sure that staying in the chlorinated water for one and a half hours will be very pleasant, in the ocean it is no problem till 2-2.5 hours, but in the Pacific I get cold by the end.
A few days ago I bought a waterproof solar training watch with a timer and 120 laps counting by pressing a button, so now I don't need to keep numbers in my head and can go into a happy trance :)
Food energy is chemical energy that animals derive from their food and molecular oxygen through the process of cellular respiration. Humans and other animals need a minimum intake of food energy to sustain their metabolism and to drive their muscles.
Organisms derive food energy from carbohydrates, fats and proteins as well as from organic acids, polyols, and ethanol present in the diet. Some diet components that provide little or no food energy, such as water, minerals, vitamins, cholesterol, and fiber, may still be necessary to health and survival for other reasons.
Using the International System of Units, researchers measure energy in joules (J) or in its multiples; the kilojoule (kJ) is most often used for food-related quantities. An older metric system unit of energy, still widely used in food-related contexts, is the "food calorie" or kilocalorie (kcal or Cal), equal to 4.184 kilojoules.
<>Fats and ethanol have the greatest amount of food energy per mass, 37 and 29 kJ/g (8.8 and 6.9 kcal/g), respectively. Proteins and most carbohydrates have about 17 kJ/g (4.1 kcal/g).
Conventional food energy is based on heats of combustion in a bomb calorimeter and corrections that take into consideration the efficiency of digestion and absorption and the production of urine.