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Volleyball Injuries
Volleyball is a game played between two opposing sides, with six players on each team, where the players use mainly their hands to hit the ball over a net and try to make the ball land on the opposing team's side of the court. Volleyball is played by over 800 million people world wide, making it one of the most popular sports in the world. Volleyball has some risks involved with it because there are some injuries which occur to players that are quite common; these include ankle injuries, shoulder injuries, foot injuries and knee injuries. Ankle sprains The majority of sprained ankles in volleyball occur when a player is at the net, either blocking or spiking. The reason why ankle sprains occur at the net is because both blocking and spiking involve jumping and possibly of landing on an opponent's foot causing the injury. Approximately 50 percent of all sprained ankles in volleyball occur when a blocker lands on the attacking player's foot, while about 25 percent occur when a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volleyball CL-2005 Poland Vs Argentina In Bydgoszcz
Volleyball is a team sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules. It has been a part of the official program of the Summer Olympic Games since Tokyo 1964. Beach volleyball was introduced to the programme at the Atlanta 1996. The adapted version of volleyball at the Summer Paralympic Games is sitting volleyball. The complete set of rules is extensive, but play essentially proceeds as follows: a player on one of the teams begins a 'rally' by serving the ball (tossing or releasing it and then hitting it with a hand or arm), from behind the back boundary line of the court, over the net, and into the receiving team's court. The receiving team must not let the ball be grounded within their court. The team may touch the ball up to three times to return the ball to the other side of the court, but individual players may not touch the ball twice consecutively. Typi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Velocity Factor
The velocity factor (VF), also called wave propagation speed or velocity of propagation (VoP or of a transmission medium is the ratio of the speed at which a wavefront (of an electromagnetic signal, a radio signal, a light pulse in an optical fibre or a change of the electrical voltage on a copper wire) passes through the medium, to the speed of light in vacuum. For optical signals, the velocity factor is the reciprocal of the refractive index. The speed of radio signals in vacuum, for example, is the speed of light, and so the velocity factor of a radio wave in vacuum is 1.0 (unity). In electrical cables, the velocity factor mainly depends on the insulating material (see table below). The use of the terms ''velocity of propagation'' and ''wave propagation speed'' to mean a ratio of speeds is confined to the computer networking and cable industries. In a general science and engineering context, these terms would be understood to mean a true speed or velocity in units of distance p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beach Volleyball
Beach volleyball is a team sport played by two teams of two or more players on a sand court divided by a net. Similar to indoor volleyball, the objective of the game is to send the ball over the net and to ground it on the opponent's side of the court. Each team also works in unison to prevent the opposing team from grounding the ball on their side of the court. Teams are allowed up to three touches to return the ball across the net, and individual players may not touch the ball twice consecutively except after a touch off an attempted block. Making a block touch leaves only two more touches before the ball must be hit over. The ball is put in play with a serve—a hit by the server from behind the rear court boundary over the net to the opponents. The receiving team typically uses their three touches to pass the ball, set it up for an attack, and then attack the ball by sending it back over the net. Meanwhile, the team on defense typically has a blocker at the net and a defender ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eccentric (sport)
Muscle contraction is the activation of tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state. For the contractions to happen, the muscle cells must rely on the interaction of two types of filaments which are the thin and thick filaments. Thin filaments are two strands of actin coiled around each, and thick filaments consist of mostly elongated proteins called myosin. Together, these two filaments form myofibrils which are important organelles in the skeletal muscle system. Muscle contraction can also be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etiology (medicine)
Cause, also known as etiology () and aetiology, is the reason or origination of something. The word ''etiology'' is derived from the Greek , ''aitiologia'', "giving a reason for" (, ''aitia'', "cause"; and , '' -logia''). Description In medicine, etiology refers to the cause or causes of diseases or pathologies. Where no etiology can be ascertained, the disorder is said to be idiopathic. Traditional accounts of the causes of disease may point to the "evil eye". The Ancient Roman scholar Marcus Terentius Varro put forward early ideas about microorganisms in a 1st-century BC book titled ''On Agriculture''. Medieval thinking on the etiology of disease showed the influence of Galen and of Hippocrates. Medieval European doctors generally held the view that disease was related to the air and adopted a miasmatic approach to disease etiology. Etiological discovery in medicine has a history in Robert Koch's demonstration that species of the pathogenic bacteria ''Mycobacterium tuberculos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chronic Condition
A chronic condition is a health condition or disease that is persistent or otherwise long-lasting in its effects or a disease that comes with time. The term ''chronic'' is often applied when the course of the disease lasts for more than three months. Common chronic diseases include diabetes, functional gastrointestinal disorder, eczema, arthritis, asthma, cancer, chronic obstructive pulmonary disease, Lyme disease, autoimmune diseases, genetic disorders and some viral diseases such as hepatitis C and acquired immunodeficiency syndrome. An illness which is lifelong because it ends in death is a terminal illness. It is possible and not unexpected for an illness to change in definition from terminal to chronic. Diabetes and HIV for example were once terminal yet are now considered chronic due to the availability of insulin for diabetics and daily drug treatment for individuals with HIV which allow these individuals to live while managing symptoms. In medicine, ''chronic'' conditio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tenderness (medicine)
In medicine, tenderness is pain or discomfort when an affected area is touched. It should not be confused with the pain that a patient perceives without touching. Pain is patient's perception, while tenderness is a sign that a clinician elicits. See also *Rebound tenderness, an indication of peritonitis Peritonitis is inflammation of the localized or generalized peritoneum, the lining of the inner wall of the abdomen and cover of the abdominal organs. Symptoms may include severe pain, swelling of the abdomen, fever, or weight loss. One part o .... References Pain {{Med-sign-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tendon
A tendon or sinew is a tough, high-tensile-strength band of dense fibrous connective tissue that connects muscle to bone. It is able to transmit the mechanical forces of muscle contraction to the skeletal system without sacrificing its ability to withstand significant amounts of tension. Tendons are similar to ligaments; both are made of collagen. Ligaments connect one bone to another, while tendons connect muscle to bone. Structure Histologically, tendons consist of dense regular connective tissue. The main cellular component of tendons are specialized fibroblasts called tendon cells (tenocytes). Tenocytes synthesize the extracellular matrix of tendons, abundant in densely packed collagen fibers. The collagen fibers are parallel to each other and organized into tendon fascicles. Individual fascicles are bound by the endotendineum, which is a delicate loose connective tissue containing thin collagen fibrils and elastic fibres. Groups of fascicles are bounded by the epitenon, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patellar Tendinitis
Patellar tendinitis, also known as jumper's knee, is an overuse injury of the tendon that straightens the knee. Symptoms include pain in the front of the knee. Typically the pain and tenderness is at the lower part of the kneecap, though the upper part may also be affected. Generally there is no pain when the person is at rest. Complications may include patellar tendon rupture. Risk factors include being involved in athletics and being overweight. It is particularly common in athletes who are involved in jumping sports such as basketball and volleyball. The underlying mechanism involves small tears in the tendon connecting the kneecap with the shinbone. Diagnosis is generally based on symptoms and examination. Other conditions that can appear similar include infrapatellar bursitis, chondromalacia patella and patellofemoral syndrome. Treatment often involves resting the knee and physical therapy. Evidence for treatments, including rest, however is poor. Recovery can take betw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jumper's Knee
Patellar tendinitis, also known as jumper's knee, is an overuse injury of the tendon that straightens the knee. Symptoms include pain in the front of the knee. Typically the pain and tenderness is at the lower part of the kneecap, though the upper part may also be affected. Generally there is no pain when the person is at rest. Complications may include patellar tendon rupture. Risk factors include being involved in athletics and being overweight. It is particularly common in athletes who are involved in jumping sports such as basketball and volleyball. The underlying mechanism involves small tears in the tendon connecting the kneecap with the shinbone. Diagnosis is generally based on symptoms and examination. Other conditions that can appear similar include infrapatellar bursitis, chondromalacia patella and patellofemoral syndrome. Treatment often involves resting the knee and physical therapy. Evidence for treatments, including rest, however is poor. Recovery can take betw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bilateral España-Portugal De Voleibol - 02
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Bilateral may refer to any concept including two sides, in particular: *Bilateria, bilateral animals *Bilateralism, the political and cultural relations between two states *Bilateral, occurring on both sides of an organism ( Anatomical terms of location § Medial and lateral) *Bilateral symmetry, symmetry between two sides of an organism *Bilateral filter, an image processing algorithm * Bilateral amplifier, a type of amplifier * ''Bilateral'' (album), an album by the band ''Leprous'' *Bilateral school, see Partially selective school (England) In England, a partially selective school is one of a few dozen state-funded secondary schools that select a proportion of their intake by ability or aptitude, permitted as a continuation of arrangements that existed prior to 1997. Though treated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
