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• W3181044080 endingPage "111474" @default.
• W3181044080 startingPage "111474" @default.
• W3181044080 abstract "Fasting improves metabolic health, but is also associated with loss of lean body mass. We investigated if old mice are less resistant to fasting-induce muscle wasting than adult mice. We compared changes in skeletal muscles and fat distribution in C57BL/6J mice subjected to 48-hour fasting at adult (6-month old) or old (24-month old) age. Old mice lost less weight (11.9 ± 1.5 vs 16.9 ± 2.8%, p < 0.001) and showed less ( p < 0.01) pronounced muscle wasting than adult mice. Extensor digitorum longus (EDL) muscle force decreased only in adult mice after fasting. Serum IGF-1 levels were higher ( p < 0.01) and showed greater ( p < 0.01) decline in adult mice compared to old mice. Phosphorylation of 4EBP1 was reduced in the gastrocnemius muscles of adult mice only. Energy expenditure was slower in old mice and showed smaller fasting-induced decline than in adult mice when adjusted for variations in physical activity. There was a loss of fat mass in both age groups, but it was more pronounced in adult mice than old mice. Our results suggest that ageing-related decrease in metabolic rate protects old mice from skeletal muscle wasting during fasting. • We investigated effects of fasting on body composition of adult and old C57BL/6J mice. • 48-hour fasting was associated with low physical activity and greater decrease serum IGF-1 in adult compared to old mice. • Fasting induced significant muscle wasting and force loss only in adult mice. • Reduced metabolic rate protects old mice from excessive muscle wasting during fasting." @default.
• W3181044080 created "2021-07-19" @default.
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• W3181044080 date "2021-09-01" @default.
• W3181044080 modified "2023-10-17" @default.
• W3181044080 title "Effects of fasting on skeletal muscles and body fat of adult and old C57BL/6J mice" @default.
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• W3181044080 doi "https://doi.org/10.1016/j.exger.2021.111474" @default.
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