Television Viewing, Walking Speed and Grip Strength in a Prospective Cohort Study
Sayer, Avan A
Medicine & Science in Sports & Exercise
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Keevil, V., Wijndaele, K., Luben, R., Sayer, A. A., Wareham, N., & Khaw, K. (2014). Television Viewing, Walking Speed and Grip Strength in a Prospective Cohort Study. Medicine & Science in Sports & Exercise, 47 735-742. https://doi.org/10.1249/MSS.0000000000000453
Purpose Television (TV) watching is the most prevalent sedentary leisure-time activity in the United Kingdom. We examined associations between TV viewing time, measured over 10 years, and two objective measures of physical capability, usual walking speed (UWS) and grip strength. Methods Community-based participants (n=8623; 48-92 years old) enrolled in the European Prospective Investigation of Cancer-Norfolk study attended a third health examination (3HC, 2006-2011) for measurement of maximum grip strength (Smedley dynamometer) and UWS. TV viewing time was estimated using a validated questionnaire (n=6086) administered during two time periods (3HC: 2006-2007; 2HC: 1998-2000). Associations between physical capability and TV viewing time category (<2hours/day; 2<3hours/day; 3<4hous/day; >4hours/day) at the 3HC, 2HC and using an average of the two measures were explored. Sex-stratified analyses were adjusted for age, physical activity, anthropometry, wealth, co-morbidity, smoking and alcohol intake and combined if no sex-TV viewing time interactions were identified. Results Men and women who watched the least TV at the 2HC or 3HC walked at a faster usual pace than those watching the most. There was no evidence of effect modification by sex (Pinteraction=0.09) and in combined analyses participants who watched on average <2hours/day walked 4.29cm/s (95% Confidence Interval 2.56, 6.03) faster that those who watched >4hrs/day, with evidence of a dose-response association (Ptrend<0.001). However, no strong associations with grip strength were found. Conclusions TV viewing time predicted UWS in older adults. More research is needed to inform public health policy and prospective associations between other measures of sedentariness, such as total sitting time or objectively measured sedentary time, and physical capability should be explored.
Sedentary behaviour, aging, muscle strength, functional health
VLK declares a Wellcome Trust clinical training fellowship [092077/Z/10/Z] and KW a British Heart Foundation intermediate basic science research fellowship [FS/12/58/29709]. For the remaining authors no conflicts of interest were declared. The EPIC-Norfolk study was supported by programme grants from the Medical Research Council [G9502233; G0401527] and Cancer Research UK [C864/A8257]. A grant from Research into Ageing  funded the 3HC clinic.
British Heart Foundation (FS/12/58/29709)
Wellcome Trust (092077/Z/10/Z)
Medical Research Council (MC_U106179471)
Cancer Research UK (A8257)
External DOI: https://doi.org/10.1249/MSS.0000000000000453
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245555
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