On average, it comprises about 20% of your total body weight. However, research since the 1980s
has cast doubt on this view. Also they can be used directly as fuel by
the muscles, particularly when muscle glycogen is depleted. For example, half of your total body
protein is broken down and replaced every 150 days. When you eat protein, it is
broken down in your digestive tract into smaller molecular units - single amino acids and
dipeptides (two amino acids linked together).Twelve of the amino acids can be made in the
body from other amino acids, carbohydrate and nitrogen. It is basically the curd, formed when
milk is separated into curds and whey. Protein has a role in maintaining optimal fluid
balance in tissues, transporting nutrients in and out of cells, carrying oxygen and regulating blood
clotting.What are amino acids?The 20 amino acids are the building blocks of proteins. Amino acids
absorbed from food (IAAs) and dispensable amino acids (DAAs) made in the body from nitrogen
and carbohydrate can also enter the free pool. Protein has long been associated with power
and strength, and as the major constituent of muscle, it would seem logical that an
increased protein intake would increase muscle size and strength.Traditionally, scientists Zapatillas Puma have held the view that
athletes do not need to consume more than the RDA for protein and that consuming
anything greater than this amount would produce no further benefit. There is considerable evidence that
the protein needs of active individuals are consistently higher than those of the general population.This
chapter will help to give you a fuller understanding of the role of protein during
exercise, and enable you to work out how much you need. It is formed when
milk is curdled (as in cheese manufacture), separating the curd (which contains mainly casein) from
the whey (which contains lactalbumin protein, lactose and fat).Casein is the other major milk protein.
Strictly speaking the body's requirement is for amino acids rather than protein.These are then re-assembled
into new proteins containing hundreds or even thousands of amino acids linked together.What types of
protein are there?There are four types of protein commonly used as protein supplements.1.whey protein2.casein3.soy protein4.egg
proteinWhey protein is one of the two major types of protein found in milk (the
other is casein). They can be combined in various ways to form hundreds of different
proteins in the body. Protein is needed for the growth and formation of new tissue,
for tissue repair and for nike tn regulating many metabolic pathways, and can also be used as
fuel for energy production. All 20 amino acids are listed in table 3.1. These are
called dispensable, or non-essential, amino acids (DAAs). As more athletes are giving up meat and
choosing a vegetarian diet, this chapter explains how you can obtain sufficient protein and other
nutrients for peak performance on a meat-free diet.WHY DO I NEED PROTEIN?Protein makes up part
of the structure of every cell and tissue in your body, including your muscle tissue,
internal organs, tendons, skin, hair and nails. They can be used to build new proteins,
they can be oxidised to produce energy and they can be converted in glucose via
gluconeogenesis or they can converted into fatty acids. It is also needed to make almost
all of the body enzymes as well as various hormones (such as adrenaline and insulin)
and neurotransmitters. PROTEIN - THE POWERHOUSEThe importance of protein - and the question of whether
extra protein is necessary for sports performance is one of the most hotly debated topics
among sports scientists, coaches and athletes and has been contended ever since the time of
the Ancient Greeks. Once in the pool, amino acids have four fates. During energy production,
the nitrogen part of the protein molecule is excreted in urine, or possibly in sweat.Paul
Jordan is a sports nutrition consultant for the Sports Nutrition Company. It will show how
individual requirements depend on the sport concerned and the training program, and also how they
are related to the carbohydrate intake. Low-fat cottage cheese is mostly casein protein together
with a little lactose and calcium.Soy protein is extracted from soybeans.Egg Protein refers to the
proteins found in whole egg.Protein metabolismTissue proteins are continually broken down (catabolised), releasing their constituent
amino acids into the "free pool", which is located in body tissues and the blood.
An example of a daily menu is given to show how to meet your own
protein requirements, and to provide a basis for developing your own menu. Branched-chain amino acids
(BCAAs) include the three IAAs with a branched molecular configuration: valine, leucine and isoleucine. The
other eight are termed indispensable, or essential, amino acids (IAAs) meaning they must be supplied
in the diet. They make up one-third of muscle protein and are a vital substrate
for two other amino acids, glutamine and alanine, which are released in large quantities during
intense aerobic exercise. SNC is a UK based sports nutrition supplements supplier.http://www.sncdirect.com.
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