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Muscle Mass Found To Be Boosted By Combining Resistance Excercise, Blood Flow Restriction
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May 16, 2010 7:02 a.m. EST
Topics: medical specialization, geriatric, physical fitness, medical research, health, United States
Ayinde O. Chase - AHN News Editor
Galveston, TX, United States (AHN) - University of Texas Medical Branch at Galveston researchers have determined that moderately and temporarily restricting the flow of blood through muscles can be combined with low-level resistance exercise training to produce muscle-mass increases in older men.
"We think that this may be a novel treatment for older people who need to bring their muscle mass back up," said University of Texas physical therapy professor Blake Rasmussen, senior author of a paper investigating the subject.
He goes on to say "It could also be used for patients who have had surgery and aren't capable of lifting enough weight to keep their muscles in shape, or for people who have arthritis or other conditions that make lifting heavy weights a problem."
University of Texas Medical Branch at Galveston investigators studied changes in the thigh muscles of seven older men (average age 70) when they performed four minutes of low-resistance leg extension exercises both with and without inflatable cuffs that reduced blood flow out of the muscles.
Researchers note that when subjects put the cuffs on, they responded similarly to young people doing traditional high-intensity resistance exercise. Additionally low-intensity exercise produced increases in protein synthesis, and activated two cellular pathways that stimulate protein synthesis and muscle growth in the post-exercise period.
Exactly how restricting blood flow in the muscles generated these effects remains unknown, however researchers speculate that either an improved ability to activate Type II muscle fibers or a response to the sudden surge of blood into the muscles when the cuffs were released could be responsible.
The findings of the study published could be useful for patients following ACL knee surgery or hip fracture surgery. Noting that in the first few weeks after ACL surgery, the joint just won't allow you to lift heavy weight. So instead, you could use a really light weight with a restriction cuff, which may prevent the muscle loss that you normally see following knee surgery.
The study in its entirety can be read in the May issue of the Journal of Applied Physiology.
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