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Despite current literature pointing to a link between shortened telomeres and aging, chronic diseases, and geriatric syndromes, the precise implications of this connection remain unclear. The aim of this exploratory, cross-sectional, observational study was to investigate the association between the relative telomere length (RTL) of peripheral blood leukocyte subtypes (mononuclear cells and granulocytes) and physical performance using the Short Physical Performance Battery (SPPB) in older adults. A cohort of 95 participants was recruited, which included men and women aged over 60 years (70.48 ± 5.5 years). It was found that mononuclear cell RTL was significantly lower than that of granulocytes (p < 0.0001). Moreover, individuals with good SPPB performance exhibited lower mononuclear cell RTL compared with those with moderate or poor performance. However, no significant differences were observed in granulocyte RTL between different SPPB performance groups. The global SPPB score showed an inverse correlation with mononuclear cell RTL, but this correlation was not present with granulocyte RTL. Similarly, the SPPB sit-to-stand domain correlated with mononuclear cell RTL, but no such correlation was found with granulocyte RTL. Our findings challenge conventional expectations, suggesting that shorter mononuclear cell RTL may be associated with favorable functional capacity. The variations in RTL between mononuclear cells and granulocytes highlight their distinct biological roles and turnover rates. A history of immune responses may influence mononuclear cell RTL dynamics, while telomerase activity may protect granulocyte RTL from significant shortening. The unexpected associations observed in mononuclear cell RTL emphasize the complex interplay between immune responses, cellular aging, and functional capacity in older adults. [ABSTRACT FROM AUTHOR]

Leukocyte telomere length in the elderly has been positively associated with healthy living and physical activity. Factors that interfere with telomere shortening are similar to those that may be associated with decreasing functional capacity. To investigate the relationship between mean leukocyte telomere length and functional capacity in community-dwelling elderly individuals, this is an observational, cross sectional, multicentric study conducted with elderly Brazilian patients. Sample characterization was performed using a sociodemographic clinical questionnaire. Telomere length was evaluated by quantitative polymerase chain reaction, and functional capacity was evaluated by the Short Physical Performance Battery (SPPB). A total of 113 elderly individuals (age 70 ± 5.4 years; 75 women and 38 men) were enrolled in this study. Unexpectedly, it was found that lower relative telomere length was associated with better physical capacity in the global SPPB score. Although telomere shortening is observed with increasing age, it is not associated with decreased functional capacity. Functionality is broad and multidimensional, involving the connection of biopsychosocial and cultural factors. While functionality may not be considered a marker of functional aging in an elderly cohort, it can still play an important role in longitudinal studies, which attempt to elucidate process theories. Future studies should use different techniques to measure telomere lengths in subpopulations of cells. [ABSTRACT FROM AUTHOR]