Light-intensity PA was found to be beneficially associated with obesity , markers of lipid and glucose metabolism , and mortality .
Conclusions Observational evidence that light-intensity PA can confer health benefits is accumulating .
Background The health effects of light-intensity physical activity ( PA ) are not well known today .
Objective We conducted a systematic review to assess the association of accelerometer-measured light-intensity PA with modifiable health outcomes in adults and older adults .
Objective measures of activity level and mortality in older men.
OBJECTIVES To examine associations between objective measures of activity level and mortality risk in older men . DESIGN Prospect i ve cohort study . SETTING Six U.S. sites . PARTICIPANTS Men aged 71 and older followed an average of 4.5 years ( N = 2,918 ) .  MEASUREMENTS Time awake spent in sedentary behavior  ( metabolic equivalent ( MET ) level ≤1.50 ) , light activity  ( MET level 1.51 - 2.99 ) , and at least moderate activity  ( MET level ≥3.00 ) measured using an activity monitor worn for 5 days or longer and expressed as quartiles . Deaths were confirmed with death certificates ; cause of death was adjudicated by review of certificates and records . RESULTS During follow-up , 409 ( 14 % ) men died . After multivariable adjustment , comparing Q4 with Q1 , more time spent in sedentary behavior ( Q4 vs Q1 , hazard ratio ( HR ) = 1.51 , 95 % confidence interval ( CI ) = 1.10 - 2.08 ) , less time spent in light activity ( Q1 vs Q4 , HR = 1.54 , 95 % CI = 1.06 - 2.24 ) , and less time spent in at least moderate activity ( Q1 vs Q4 , HR = 1.56 , 95 % CI = 1.09 - 2.25 ) were similarly associated with greater mortality risk primarily due to higher risks of cardiovascular and noncardiovascular , noncancer death . The association between time spent in sedentary behavior and mortality varied according to time spent at higher activity level . More time spent in sedentary behavior was associated with greater risk of death in men spending 1.2 ( median ) h/d or more in at least moderate activity ( Q4 vs Q1 , HR = 2.09 , 95 % CI = 1.26 - 3.49 ) but not in those spending less time ( Q4 vs Q1 , HR = 1.02 , 95 % CI = 0.62 - 1.66 ) ( P = .005 for interaction ) . CONCLUSION In older men exceeding current guidelines on physical activity , more time spent in sedentary behavior is associated with greater mortality risk
Light-intensity PA was found to be beneficially associated with obesity , markers of lipid and glucose metabolism , and mortality .
Conclusions Observational evidence that light-intensity PA can confer health benefits is accumulating .
Background The health effects of light-intensity physical activity ( PA ) are not well known today .
Objective We conducted a systematic review to assess the association of accelerometer-measured light-intensity PA with modifiable health outcomes in adults and older adults .