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As illustrated, the posture, which creates the greatest pressure on the intervertebral discs, is bending forward when lifting weights from a seated position, that which is similar to performing the deadlift. Note that lifting from the seated positon increases disc load by 2.75x and standing with forward bending increases disc load by 2.25x. If you combine the positional increase in disc pressure and heavy loads such as that with deadlifting; it becomes apparent that while lifting heavy loads during lifts such as the deadlift one puts themselves at an increased risk of disc injury.
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