Associations of Leukocyte Telomere Length With Aerobic and Muscular Fitness in Young Adults

• Published in: American Journal of Epidemiology
• Main Authors: Williams, DM, Buxton, JL, Kantomaa, MT, Tammelin, TH, Blakemore, AIF, Jarvelin, M-R
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press 2016
• Subjects: Science & Technology; Life Sciences & Biomedicine; Public; Environmental & Occupational Health; aerobic fitness; biological aging; handgrip strength; Northern Finland Birth Cohorts; telomere length; PHYSICAL-ACTIVITY; NORTHERN FINLAND; CARDIOVASCULAR-DISEASE; GRIP STRENGTH; BIRTH COHORT; HEALTH; CAPACITY; CAPABILITY; INDICATORS; MORTALITY; Adult; Age Factors; Body Mass Index; Cross-Sectional Studies; Female; Finland; Hand Strength; Humans; Leukocytes; Male; Muscle Strength; Physical Endurance; Physical Fitness; Sex Factors; Telomere Homeostasis; Epidemiology; 11 Medical And Health Sciences; 01 Mathematical Sciences; Northern Finland
• Online Access: http://hdl.handle.net/10044/1/48059; https://doi.org/10.1093/aje/kww123

Decline in both telomere length and physical fitness over the life course may contribute to increased risk of several chronic diseases. The relationship between telomere length and aerobic and muscular fitness is not well characterized. We examined whether there are cross-sectional associations of mean relative leukocyte telomere length (LTL) with objective measures of aerobic fitness, muscle strength, and muscle endurance, using data on 31-year-old participants of the Northern Finland Birth Cohort 1966 (n = 4,952–5,205, varying by exposure-outcome analysis). Aerobic fitness was assessed by means of heart rate measurement following a standardized submaximal step test; muscular fitness was assessed by means of a maximal isometric handgrip strength test and a test of lower-back trunk muscle endurance. Longer LTL was associated with higher aerobic fitness and better trunk muscle endurance in models including adjustment for age, sex, body mass index, socioeconomic position, diet, smoking, alcohol consumption, physical activity level, and C-reactive protein. In a sex-stratified analysis, LTL was not associated with handgrip strength in either men or women. LTL may relate to aspects of physical fitness in young adulthood, but replication of these findings is required, along with further studies to help assess directions and causality in these associations.