Only 7 Days Muscle Building: Obesity is associated with many health problems, including heart disease, type 2 diabetes and high blood pressure. According to a new study published in the Journal of Physiology, obesity also reduces a person’s ability to exercise muscles after exercising resistance.
“Some previous studies, including some in our laboratory, showed that obese adults had reduced muscle protein synthesis after eating food compared to normal-weight adults,” said Nicholas Burd, professor of kinematics and community health at the University of Illinois. He directed the new study. Student of Nutritional Sciences Joseph Beers Division. “Our new research goes a step further and shows that the construction of new muscle proteins in the nourishment state after weight training can cause obesity-related damage.”
Beals and his colleagues recruited nine obese adults and nine normal adults between 20 and 23 years for the new study. Participants who did not participate in the regular exercise program conducted several standardized health surveys and were considered healthy but “insufficient” before participating in the study.
After evaluating the participants’ body composition, glucose tolerance and the ability to participate in the weighted leg stretch, the researchers began the infusion of stable isotopically marked phenylalanine in all subjects. This allows the team to control the levels of amino acids in the blood and muscle of the participants throughout the experiment.
The team performed a muscle biopsy of one leg of each subject and then performed four groups of 10-12 repeated resistance exercises with the opposite leg.
Burd said that this weightlifting agreement is more demanding than most current sports recommendations.
After the exercise, the subjects immediately consumed 170 grams of lean pork, which contained 36 grams of protein and 4 grams of fat. Then, the researchers collected additional muscle biopsies from the athletic and inactive legs 120 and 300 minutes after the intake of pork.
“By using the participants’ non-sporting legs as control in the experiment, we were able to directly compare how weight lifting affects the ability of muscles to build new proteins and non-motor states,” Burd said.
As expected, there was a significant difference between obese and normal weight participants before the experiment began, Burd said.
“The concentration of insulin in plasma in obese adults is approximately 3.2 times higher at the beginning, which highlights a certain degree of systemic resistance to insulin,” he said. “Because obesity is associated with an increase in muscle mass, but the quality of metabolism is low, they can do less work per unit of lean muscle than their normal weight partners.”
The additional differences between normal and obese adults occurred after exercise and the intake of protein-intensive foods. The most important of these is the rate of protein synthesis of myofibrillar proteins, which produce muscles that cause muscles to grow as they move.
The researchers found that after consumption of pork, all participants had increased rates of synovial protein synthesis in both legs. However, in adults of normal weight, the expected increase in protein synthesis in athletic legs is stronger than in obese pairs.
“We show that muscle building and repair after exercise becomes boring among obese young people,” Bird said. “This is important because the accumulation and repair of muscles after exercise has a long-term effect on metabolic health and physical performance in general.”