Let’s take a closer look at the main nutrients we must eat for our body to produce the needed ATP to tackle physical activities we may encounter. These systems have been adapted for supplying energy at the required rate and in the necessary amount for that activity or "workload" placed on the body. It is these different forms of “conversions” and ingredients used for that conversion, that our body calls on when it is confronted with a demand for energy that allows it to perform tasks of varying intensities and durations.ĭepending on the activity in which you are engaged, the body will make use of different fuels to help power energy systems (like gears in a car) which will produce the only form of energy needed for our muscles to work, ATP. Instead of going to a "refueling station" like a car does, we eat food, taking in different forms of fuels that in one way or another get converted into our universal fuel, ATP. Our fuel is Adenosine triphosphate, or ATP. Much like a car, your body needs fuel in order to move as a response to a "workload" being applied to it. This automatic changing of gears allows you to drive at a higher speed. If you drive a manual transmission car (often called a standard transmission) you physically have to change gears as the car accelerates, whereas in a vehicle with an automatic transmission the changing of gears is done for you. This adds fuels to the engine and in turn, signals an increase in "work" to be done by the engine so it starts to pick up speed. ![]() ![]() When driving a car, to accelerate you have to press down on the gas pedal. The Science of Cooking: What Gives Meat its Colour?Ī time for action, but first let’s eat! - Energy production and nutrients.: Does muscle fiber type determine sports ability?.walking, long flights) and white meat is for short, explosive bursts of power (ie. Remember, dark meat is for endurance (ie. So the next time you are eating a chicken wing or piece of pork, take a look at the colouring of the meat and try to guess what kind of activity that muscle is best suited for. Hence, it’s this extra oxygen carrying protein that gives the muscle (meat) a darker colour. Muscle fibres that use aerobic respiration for energy production contain a similar protein called myoglobin, which is responsible for carrying oxygen molecules in the muscle fibre. In blood we have a protein called hemoglobin which is responsible for carrying oxygen around the circulatory system. If you were to look at muscle fibres that predominately use this form of energy production you will notice that it is dark in colour. ![]() Type 1 fibres use oxygen to generate energy Type IIA also uses oxygen to produce energy but can also produce energy without it, whereas FT Type IIb fibres does not use any oxygen to produce energy.Īs you will learn in the following activity, there are 3 energy systems in the body and only one of them uses oxygen, namely the Aerobic system (cellular respiration). The key difference between slow twitch or fast twitch fibres is the ability to use oxygen. Human muscles contain, to a large extent, a genetically determined mixture, on average, 50% ST and 50% FT. These distinctions seem to influence the ways muscles generate force and energy. It is generally accepted that muscle fiber types can be broken down into two main types: These fibres are responsible for producing force when asked to contract and in turn, replenish energy stores used for that contraction. In some cases, especially with turkey, you may be asked at a restaurant which colour you prefer.ĭid you know that the colour (usually classified as white or dark) of the meat tells you about its properties? The meat we eat is predominantly muscle, and muscle is made of fibres. ![]() If you eat meat, you have at one time or another, come across different shades of meat.
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