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Long Term Calorie Restriction in Rats Slows Muscle Fiber Atrophy with Aging


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#1 reason

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Posted 02 September 2021 - 10:22 AM


Muscle mass and strength declines with age, leading to sarcopenia and contributing to frailty. Many distinct mechanisms are thought to be involved, from stem cell inactivity to chronic inflammation. Most of these mechanisms are favorably impacted by the sweeping metabolic changes induced by the practice of calorie restriction. The study here adds to past evidence for calorie restriction to slow the onset of sarcopenia, yet another of the many reasons to consider it as a lifestyle choice.

Aging causes loss of skeletal muscle mass and function, which is called sarcopenia. While sarcopenia impairs the quality of life of older adults and is a major factor in long-term hospitalization, its detailed pathogenic mechanism and preventive measures remain to be identified. Caloric restriction (CR) suppresses age-related physiological and pathological changes in many species and prolongs the average and healthy life expectancy. It has recently been reported that CR suppresses the onset of sarcopenia; however, few studies have analyzed the effects of long-term CR on age-related skeletal muscle atrophy. Thus, we investigated the aging and CR effects on soleus (SOL) muscles of 9-, 24-, and 29-month-old ad libitum-fed rats (9AL, 24AL, and 29AL, respectively) and of 29-month-old CR (29CR) rats.

The total muscle cross sectional area (mCSA) of the entire SOL muscle significantly decreased in the 29AL rats, but not in the 24AL rats, compared with the 9AL rats. SOL muscle of the 29AL rats exhibited marked muscle fiber atrophy and increases in the number of muscle fibers with a central nucleus, in fibrosis, and in adipocyte infiltration. Additionally, although the decrease in the single muscle fiber cross-sectional area (fCSA) and the muscle fibers' number occurred in both slow-type and fast-type muscle fibers, the degree of atrophy was more remarkable in the fast-type fibers.

However, CR suppressed the muscle fiber atrophy observed in the 29AL rats' SOL muscle by preserving the mCSA and the number of muscle fibers that declined with aging, and by decreasing the number of muscle fibers with a central nucleus, fibrosis, and denervated muscle fibers. Overall, these results revealed that advanced aging separately reduces the number and fCSA of each muscle fiber type, but long-term CR can ameliorate this age-related sarcopenic muscle atrophy.

Link: https://doi.org/10.1...ger.2021.111519


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#2 Fernando G

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Posted 04 September 2021 - 11:29 AM

Humans are different, 90% of CRONIES or flexible CR or junk food CR will not eat the same calorie every day and the same food every day and the same exercise every day. a low protein, low calorie diet would be more effective let's assume Dave Fisher beef 2x week 1600 kcal 5 foot 10 inches and 150 pounds low aerobic. The guy is very preserved due to low protein. Matthew Lake 1500 kcal Vegan sedentary also very well preserved and has 13% fat in adipometer 5 foot 7 inches, even in England where the average temperature is 8 degrees Celsius it eats few calories due to low protein and low percentage of muscle.Eugenia Cooney appears to be 5 foot 6 13 or 15 years old and over 15% fat even at 48-60 lbs. Alcohol and physical inactivity would also help in the process of losing muscle mass and slowing down the BMR in the long run.Deficit of 30% or more is ok


Edited by Fernando G, 04 September 2021 - 11:40 AM.





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