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Crazy Bulk : At the same time, blood flow becomes constricted throughout this muscular contraction. What's a lot of, the longer the muscle is contracted, the larger the lactic acid build-up combined with the constriction of blood flow. This is why high repetition exercise sets tend to make a bigger "muscle pump" than lower rep sets. When this kind of "hose kink" within the blood vessels is relieved at the cessation of muscular contraction, the blood rushes into the interstitial areas round the muscle tissue and causes the temporary swelling we refer to as a "muscle pump."
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