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Reference.org
Pulled hamstring
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<p><a href="/facts/Muscle_strain/wnAWmHWb">Straining</a> of the <a href="/facts/Hamstring/svAuCSev">hamstring</a>, also known as a pulled hamstring, is defined as an excessive stretch or tear of <a href="/facts/Muscle_fibers/cP7Jea3q">muscle fibers</a> and related tissues. Hamstring injuries are common in athletes participating in many sports. Track and field athletes are particularly at risk, as hamstring injuries have been estimated to make up 29% of all injuries in sprinters. Hamstring injuries can also come with a hip injury from sprinting. Symptoms for a hip injury are pain, aching and discomfort while running or any physical exercise. </p><p>The <a href="/facts/Biceps_femoris/MaaDJeD8">biceps femoris</a> long head is at the most risk for injury, possibly due to its reduced moment of knee and hip flexion as compared to the medial hamstrings. </p>