TY - JOUR
T1 - Twelve-Year Television Viewing Time Trajectories and Physical Function in Older Adults
AU - Reid, Natasha
AU - Healy, Genevieve N.
AU - Daly, Robin M.
AU - Baker, Peter
AU - Eakin, Elizabeth G.
AU - Dunstan, David W.
AU - Owen, Neville
AU - Gardiner, Paul A.
PY - 2017/7
Y1 - 2017/7
N2 - INTRODUCTION: The purpose of this study was to identify trajectories of older adults’ television viewing (TV) time over 12 years; and, to examine their associations with performance-based measures of physical function. METHODS: Data on TV time (hours/week) and socio-demographic factors were collected at each assessment of the Australian Diabetes, Obesity and Lifestyle (AusDiab) Study (1999/2000; 2004/2005; 2011/2012), with objective measures of physical function (2.44m timed-up-and-go [TUG, seconds] and knee extensor test [KES, kg]) collected at the final (2011/2012) assessment. Regression analyses examined predictors of trajectory membership and associations with TUG and KES in those aged 60+ years in 2011/2012. RESULTS: Six TV time trajectories were identified among the 1938 participants (aged 60-97, 54% female): consistently-low (9.7%); low-increasing (22.3%); moderate-decreasing (13.5%); moderate-increasing (30.3%); consistently-high (18.9%); and, high-increasing (5.2%). There were no statistically significant relationships with TUG (p>0.05). In the fully adjusted model, KES performance was significantly better in the consistently-low, low-increasing and consistently- high trajectories, compared to the moderate-increasing trajectory (P < 0.001, R = 0.33). CONCLUSION: 12-year trajectories of TV time were associated with muscle strength in older adults. These findings suggest that patterns of sedentary behavior can be a determinant of muscle strength in later life.
AB - INTRODUCTION: The purpose of this study was to identify trajectories of older adults’ television viewing (TV) time over 12 years; and, to examine their associations with performance-based measures of physical function. METHODS: Data on TV time (hours/week) and socio-demographic factors were collected at each assessment of the Australian Diabetes, Obesity and Lifestyle (AusDiab) Study (1999/2000; 2004/2005; 2011/2012), with objective measures of physical function (2.44m timed-up-and-go [TUG, seconds] and knee extensor test [KES, kg]) collected at the final (2011/2012) assessment. Regression analyses examined predictors of trajectory membership and associations with TUG and KES in those aged 60+ years in 2011/2012. RESULTS: Six TV time trajectories were identified among the 1938 participants (aged 60-97, 54% female): consistently-low (9.7%); low-increasing (22.3%); moderate-decreasing (13.5%); moderate-increasing (30.3%); consistently-high (18.9%); and, high-increasing (5.2%). There were no statistically significant relationships with TUG (p>0.05). In the fully adjusted model, KES performance was significantly better in the consistently-low, low-increasing and consistently- high trajectories, compared to the moderate-increasing trajectory (P < 0.001, R = 0.33). CONCLUSION: 12-year trajectories of TV time were associated with muscle strength in older adults. These findings suggest that patterns of sedentary behavior can be a determinant of muscle strength in later life.
UR - http://www.scopus.com/inward/record.url?scp=85014004392&partnerID=8YFLogxK
U2 - 10.1249/MSS.0000000000001243
DO - 10.1249/MSS.0000000000001243
M3 - Article
C2 - 28240701
AN - SCOPUS:85014004392
VL - 49
SP - 1359
EP - 1365
JO - Medicine & Science in Sports & Exercise
JF - Medicine & Science in Sports & Exercise
SN - 0195-9131
IS - 7
ER -