Some of the top trainers in bodybuilding are currently
employing occlusion training or blood flow restriction training, as it is also
called. It's a technique in which the upper arm or upper leg is wrapped with a compression sleeve, knee
wrap, or wrist wrap, to the point where the veins are mildly compressed, but
not so tightly that the arteries are restricted.
According to Dr. Layne Newton, Blood Flow Restriction training when performed properly allows one to use much lower weights than normal training protocols and still achieve sizable anabolic training responses. If you can find the perfect line between "tight" and "too tight," you create a state in the muscle where the blood can get into the muscle through the arteries, but has trouble exiting the muscle through the veins. Metabolic by-product accumulation is primary mechanism by which occlusion training produces hypertrophy. These metabolic by-products would normally be ‘washed out’ by normal blood flow, but occlusion allows them to accumulate near the muscle. In other words, occlusion training drives more total blood into the muscle.
Dr. Jacob Wilson cited three major reasons why this is beneficial.
Occlusion training engorges muscle cells with so much fluid that the muscle
cells are forced to stretch and expand. You may think you've experienced
"skin-tearing" muscle pumps during blood-gorging sets, but this technique could
make you rethink what a pump can be.
The accumulation of blood in the muscle lowers the cellular oxygen levels and
makes your muscles feel weaker. In response, your body recruits the larger
fast-twitch muscle fibers, which are more receptive to growth.
Finally, when oxygen is low, lactic acid rapidly accumulates in the muscle.
This may sound bad—and I'll be honest, it doesn't feel great—but some recent
studies have shown that lactic acid by itself can increase protein synthesis and
spur muscle growth.
BFR training is very difficult even though the loads are very light. It is easily the most painful form of training I have ever performed. As always, before starting any kind of new training protocol, you should talk with a medical professional. BFR can be performed for the thighs, calves, upper arms, and forearms using a blood pressure cuff or tightly wrapped knee wraps (more practical). To occlude the thighs and upper arms, wrap at approximately 70% of maximum tightness around the uppermost part of the muscles. To occlude the calves or forearms wrap at approximately 70% of maximum tightness just below the knee or elbow.
Perform 3-5 sets to muscular failure with 20-50% of your 1 rep max on a given exercise with the muscle occluded the entire time. Rest periods should be 30-60 seconds between sets. After the final set remove the wraps and restore blood flow to the muscle. A word of advice, be prepared for a lot of pain and if you do not find yourself in excruciating pain, the odds are the wraps are not tight enough. Try blood flow restriction training and take your training to another hypertrophic dimension
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