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Blood-spinning
Blood-spinning is a medical procedure used to shorten the healing time of an injury. Small samples of the patient's blood are taken and spun in a centrifuge, allowing platelets and blood plasma to be isolated from other blood components. The platelets and plasma are then combined forming platelet-rich plasma (PRP), which has high concentrations of natural growth factors. The PRP sample can then be injected into the patient's injury, which may help reduce pain and improve recovery speeds.〔(【引用サイトリンク】title=What Is Blood Spinning? )〕
== Use in professional sports ==
This procedure has been deemed controversial at times, especially when used by athletes. In 2005, the World Anti-Doping Agency ruled that blood-spinning could be used to introduce banned substances,〔(【引用サイトリンク】title=Rapid healing trick falls foul of anti-doping rules )〕 and in 2010 the agency went as far as banning the use of intramuscular injections of PRP in competitive athletes amid some concerns that it boosted performance-enhancing growth factors. However, that ban was lifted the following year, after it was concluded that there was a "lack of any current evidence concerning the use of these methods for purposes of performance enhancement". There is some debate about the effectiveness of the procedure on improving healing times, with some doctors suggesting the evidence is inconclusive or contentious.〔(【引用サイトリンク】title=Blood spinning promising; studies inconclusive )〕〔(【引用サイトリンク】title=Blood spinning – legal but controversial )〕
Numerous professional athletes in a variety of sports have used blood-spinning to help recover from injuries, including professional tennis player Rafael Nadal,〔(【引用サイトリンク】title=REVEALED: How broken Nadal was rebuilt with the help of blood spinning to achieve one of sport's greatest ever comebacks )〕〔(【引用サイトリンク】title=Rafael Nadal learns to control pain in fighting back to No 1 again )〕 professional golfer Tiger Woods, and former NFL player Hines Ward.〔(【引用サイトリンク】title=Spinning Blood Isn't Just for Athletes )〕 The practice is allowed by FIFA and has been used in the UK at Tottenham Hotspur, and at Chelsea during José Mourinho's managerial stint at the club.〔(【引用サイトリンク】title=Tottenham in market for striker while Jermain Defoe nurses muscle tear )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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