Summary Sedentary behaviour is associated with lower cognitive performance , although the attributable risk of sedentary time to all-cause dementia incidence is unclear .
Our systematic review provides evidence that limiting sedentary time and concomitantly engaging in regular moderate-to-vigorous physical activity may best promote healthy cognitive ageing
Aim The increasing rate of all-cause dementia worldwide and the lack of effective pharmaceutical treatments emphasise the value of lifestyle approaches as prevention strategies .
Emerging evidence suggests sedentary behaviour is associated with impaired cognitive function .
A better underst and ing of this association would significantly add to our knowledge of how to best promote healthy cognitive ageing .
Thus , we conducted a systematic review ascertaining the contribution of sedentary behaviour towards associated changes in cognitive function over the adult lifespan .
Power and sample size calculations. A review and computer program.
Methods of sample size and power calculations are review ed for the most common study design s. The sample size and power equations for these design s are shown to be special cases of two generic formulae for sample size and power calculations . A computer program is available that can be used for studies with dichotomous , continuous , or survival response measures . The alternative hypotheses of interest may be specified either in terms of differing response rates , means , or survival times , or in terms of relative risks or odds ratios . Studies with dichotomous or continuous outcomes may involve either a matched or independent study design . The program can determine the sample size needed to detect a specified alternative hypothesis with the required power , the power with which a specific alternative hypothesis can be detected with a given sample size , or the specific alternative hypotheses that can be detected with a given power and sample size . The program can generate help messages on request that facilitate the use of this software . It writes a log file of all calculated estimates and can produce an output file for plotting power curves . It is written in FORTRAN-77 and is in the public domain
Summary Sedentary behaviour is associated with lower cognitive performance , although the attributable risk of sedentary time to all-cause dementia incidence is unclear .
Our systematic review provides evidence that limiting sedentary time and concomitantly engaging in regular moderate-to-vigorous physical activity may best promote healthy cognitive ageing
Aim The increasing rate of all-cause dementia worldwide and the lack of effective pharmaceutical treatments emphasise the value of lifestyle approaches as prevention strategies .
Emerging evidence suggests sedentary behaviour is associated with impaired cognitive function .
A better underst and ing of this association would significantly add to our knowledge of how to best promote healthy cognitive ageing .
Thus , we conducted a systematic review ascertaining the contribution of sedentary behaviour towards associated changes in cognitive function over the adult lifespan .