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Certainly, the existence and level of any such ceiling need further exploration. These various observations suggest that overall health is better in elderly individuals who take an average of >8000?steps/day and/or spend >20?min/day at an intensity >3 MET (Fig.?2). Furthermore, physical and psychosocial health seem better in older individuals who undertake a larger proportion of their daily activity at an intensity >3 MET (i.e. those who fall on or above the dotted line in Fig.?2). It would be useful to test the causal nature of the inference that among those who currently take a baseline of http://www.selleckchem.com/products/ABT-737.html an increase of 2000?steps/day and/or respective increments of >5 or >10?min/day http://www.selleckchem.com/products/Nutlin-3.html of physical activity >3 MET would lead to practical and clinically significant health advantages (Fig.?2). Consistent participation in moderate physical activity appears necessary to optimize health.1�C3 Various authors have identified the day of the week and the month or season of the year as factors that commonly influence the physical activity of free-living people.11,12,15 The periods of 2.3, 3.5 and 7.0?days observed in power spectrum analyses of our individual step count data appear unrelated to sex, age or exercise habit,12 but might be modulated substantially by symptoms of anxiety and depression. The data suggest that in those with symptoms of anxiety and/or depression, intraindividual variations within a 1-week period are less marked than in the remainder of our sample, whereas the variations over an approximately 3-month period are greater than in other subjects. The implication might be that a depressed person has less interest in and/or less concern for things, and in consequence his or her lifestyle http://www.selleck.cn/products/Methazolastone.html becomes more monotonous. However, this tendency might vary with the season (particularly in those with seasonal affective disorder) and other short-term fluctuations of mood state. Variability in habitual physical activity is linked not only to common endogenous factors such as mood state, but also to exogenous influences, particularly precipitation, day length (time from sunrise to sunset) and the range of ambient temperatures.11,12,15 In older individuals from Nakanojo, physical activity decreases exponentially from 6600 to 4000?steps/day with increasing precipitation.11 We suggest that a count