Muscle Fibres
Discuss the relationship between distribution of muscle fibre type and performance. How might exercise training modify or change a person’s fibre-type distribution? There are four different types of muscle fibres: type 1, type 2a, type 2x, and type 2c. “A single skeletal muscle contains fibres having different speeds of shortening and ability to generate maximal force: type 1 (slow-twitch) fibres and type 2 (fast-twitch) fibres. Type 1 fies take approximately 110 ms to reach peak tension when stimulated. Type 2 fibres can reach peak tension in about 50 ms” (Kenney and Wilmore, 2008, pg. 37). Type 1 muscle fibres contract and expand more slowly than fast-twitch fibres. They are stimulated at lower efforts of strength and produce small
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The body does not use too much of consumed carbohydrates, which provides only 240 kcal of energy. “Body fat and carbohydrate stores provide the major sources of exercise fuel; whereas fat sources (plasma free fatty acids derived from adipose tissue and intramuscular triglycerides) are relatively plentiful, carbohydrate sources (plasma glucose derived from the liver or dietary carbohydrate intake, and muscle glycogen stores) are limited” (Burke, 2004, pg. 15). When the body limits carb intakes to only what is essential and increasing fats and proteins will more efficiently burn …show more content…
Blood also picks up the waste products of the body and carries them to the lungs where they can be exhaled. The human heart has four chambers- two atriums and two ventricles. The two ventricles have thick walls. The atriums have thin walls. Each chamber generates a certain amount of pressure depending on the thickness or thinness of the walls. Through the pulmonary vein the right atrium receives deoxygenated blood from the body tissues. The right atrium sends deoxygenated blood to the right ventricle and pumps it to the lungs to be oxygenated in the vena cava. “The left atrium receives oxygenated blood from the lungs through the pulmonary vein, while the left ventricle receives blood from the left atrium and pumps it to all body parts through the aorta” (Iaizzo,
The body does not use too much of consumed carbohydrates, which provides only 240 kcal of energy. “Body fat and carbohydrate stores provide the major sources of exercise fuel; whereas fat sources (plasma free fatty acids derived from adipose tissue and intramuscular triglycerides) are relatively plentiful, carbohydrate sources (plasma glucose derived from the liver or dietary carbohydrate intake, and muscle glycogen stores) are limited” (Burke, 2004, pg. 15). When the body limits carb intakes to only what is essential and increasing fats and proteins will more efficiently burn …show more content…
Blood also picks up the waste products of the body and carries them to the lungs where they can be exhaled. The human heart has four chambers- two atriums and two ventricles. The two ventricles have thick walls. The atriums have thin walls. Each chamber generates a certain amount of pressure depending on the thickness or thinness of the walls. Through the pulmonary vein the right atrium receives deoxygenated blood from the body tissues. The right atrium sends deoxygenated blood to the right ventricle and pumps it to the lungs to be oxygenated in the vena cava. “The left atrium receives oxygenated blood from the lungs through the pulmonary vein, while the left ventricle receives blood from the left atrium and pumps it to all body parts through the aorta” (Iaizzo,