Abstract
Exercise-induced positive changes in skeletal muscle properties and metabolism decrease the risk for disability, cardiometabolic diseases and mortality. Here, we studied muscle properties and glucose homeostasis in a non-exercise stage in twin pairs with co-twins discordant for physical activity habits for at least 32 years of their adult lives. Isometric knee extension force, MR imaging of midthigh tissue composition and muscle volume, and fasting blood samples were acquired from 16 same-sex (seven monozygotic, nine dizygotic) middle-aged and older twin pairs. The consistently active twins had 20 % higher knee extension forces than their inactive co-twins (p = 0.006) although the active twins had only 4 % higher midthigh muscle cross-sectional areas (p = 0.072). These results were similar in intrapair analysis in which only the seven identical twin pairs were included. The ratio between the area of midthigh fat and muscle tissues was significantly lower among the active twins (0.65 vs. 0.48, p = 0.006). The active twins had also lower fasting plasma glucose levels (5.1 vs 5.6 mmol/l, p = 0.041). The area of midthigh intramuscular (extramyocellular) fat was associated with the markers of glucose homeostasis, especially with glycated hemoglobin, and these associations were emphasized by the diabetic and inactive twins. Regular exercise throughout the adult life retains muscle strength and quality but not necessarily mass. The regular use of muscles also prevents from the accumulation of intramuscular fat which might be related to maintained glucose metabolism and, thus, prevention of metabolic disorders.
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Acknowledgments
We acknowledge support from the EC FP7 Collaborative Project MYOAGE (GA-223576). The TWINACTIVE study was supported by the Academy of Finland (Grant 114 866 and Centre of Excellence in Complex Disease Genetics, (grant numbers: 213506, 129680)) and Finnish Ministry of Education. Tuija Leskinen was supported by the Finnish Cultural Foundation, Juho Vainio Foundation, and Yrjö Jahnsson Foundation. Dr Urho Kujala was supported by the Juho Vainio Foundation.
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Leskinen, T., Sipilä, S., Kaprio, J. et al. Physically active vs. inactive lifestyle, muscle properties, and glucose homeostasis in middle-aged and older twins. AGE 35, 1917–1926 (2013). https://doi.org/10.1007/s11357-012-9486-7
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DOI: https://doi.org/10.1007/s11357-012-9486-7