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Leisure-time physical activity and high-risk fat: a longitudinal population-based twin study

Abstract

Background and Objective:

Exercise is thought to reduce high-risk body fat, but intervention studies are frequently limited by short follow-ups and observational studies by genetic selection. Therefore, we studied the effects of a physically inactive vs active lifestyle on high-risk (visceral, liver and intramuscular) fat in twin pairs discordant for leisure-time physical activity habits for over 30 years.

Design:

A longitudinal population-based twin study.

Subjects:

Sixteen middle-aged (50–74 years) same-sex twin pairs (seven monozygotic (MZ), nine dizygotic (DZ)) with long-term discordance for physical activity habits were comprehensively identified from the Finnish Twin Cohort (TWINACTIVE study). Discordance was initially defined in 1975 and the same co-twin remained significantly more active during the 32-year-long follow-up.

Main Outcome Measures:

Magnetic resonance imaging-assessed visceral, liver and intramuscular fat.

Results:

In within-pair analyses carried out after the adult life-long discordance in physical activity habits, the physically inactive co-twins had 50% greater visceral fat area compared with the active co-twins (mean difference 55.5 cm2, 95% confidence interval (CI) 7.0–104.1, P=0.010). The liver fat score was 170% higher (13.2, 95% CI 3.5–22.8, P=0.030) and the intramuscular fat area 54% higher (4.9 cm2, 95% CI 1.9–7.9, P=0.002) among the inactive co-twins. All the trends were similar for MZ and DZ pairs. Peak oxygen uptake was inversely associated with visceral (r=−0.46, P=0.012) and intramuscular fat area (r=−0.48, P=0.028), with similar trends in intrapair difference correlations (r=−0.57, P=0.021 and r=−0.50, P=0.056, respectively). The intrapair difference correlation between visceral and intramuscular fat was also high (r=0.65, P=0.009).

Conclusion:

Regular physical activity seems to be an important factor in preventing the accumulation of high-risk fat over time, even after controlling for genetic liability and childhood environment. Therefore, the prevention and treatment of obesity should emphasize the role of regular leisure-time physical activity.

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Acknowledgements

The TWINACTIVE study was supported by the Academy of Finland (Grant 114 866 and Centre of Excellence in Complex Disease Genetics) and Finnish Ministry of Education. Dr Kujala was supported by the Juho Vainio Foundation, Mrs Leskinen was supported by the Finnish Cultural Foundation, and Dr Pietiläinen was supported by Helsinki University Central Hospital Grants.

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Leskinen, T., Sipilä, S., Alen, M. et al. Leisure-time physical activity and high-risk fat: a longitudinal population-based twin study. Int J Obes 33, 1211–1218 (2009). https://doi.org/10.1038/ijo.2009.170

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