Abstract
Leukocyte telomere length (LTL) is known to be associated with mortality, but its association with age-related decline in physical functioning and the development of disability is less clear. This study examined the associations between LTL and physical functioning, and investigated whether LTL predicts level of physical functioning over an 11-year follow-up. Older mono- (MZ) and dizygotic (DZ) twin sisters (n = 386) participated in the study. Relative LTL was measured by qPCR at baseline. Physical functioning was measured by 6-min walking distance and level of physical activity (PA). Walking distance was measured at baseline and at 3-year follow-up. PA was assessed by questionnaire at baseline and at 3- and 11-year follow-ups. The baseline analysis was performed with path models, adjusted with age and within-pair dependence of twin pairs. The longitudinal analysis was performed with a repeated measures linear model adjusted for age and longitudinal within-pair dependence. A nonrandom missing data analysis was utilized. At baseline, in all individuals, LTL was associated with PA (est. 0.14, SE 0.06, p = 0.011), but not with walking distance. Over the follow-up, a borderline significant association was observed between LTL and walking distance (est. 0.14, SE 0.07, p = 0.060) and a significant association between LTL and PA (est. 0.19, SE 0.06, p = 0.001). The results suggest that LTL is associated with PA and may, therefore, serve as a biomarker predicting the development of disability. Longitudinal associations between LTL and PA were observed only when nonrandom data missingness was taken into account in the analysis.
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Acknowledgments
The authors acknowledge Dr. Iiris Hovatta and Ms. Jenni Lahtinen for their help in carrying out the telomere length analysis by qPCR. The Gerontology Research Center is a joint effort between the University of Jyväskylä and the University of Tampere. The Finnish Twin Study of Aging (FITSA) was funded by the Ministry of Education, Academy of Finland, and the EC FP5 GenomEUtwin project (grant numbers 213506 and 129680). E.S. and T.T. are supported by post doc research grants from the Academy of Finland (grant numbers 260001 and 286536). J.K. has been supported by the Academy of Finland (grants 265240 and 263278).
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The study protocol has been approved by the Ethics Committee of the Central Hospital District of Central Finland (K-S shp: Dnro 24/2000)
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Sillanpää, E., Törmäkangas, T., Rantanen, T. et al. Does telomere length predict decline in physical functioning in older twin sisters during an 11-year follow-up?. AGE 38, 34 (2016). https://doi.org/10.1007/s11357-016-9898-x
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DOI: https://doi.org/10.1007/s11357-016-9898-x