The very first activity tracker was created hundreds of years ago. It was based on a mechanical watch of the time and was used to count steps. Fast forward to today and there are hundreds of different options that can be built into our phones, placed on our shoes, clipped onto our clothing, or worn on wrist like a watch. The irony being, that over the past century obligatory physical activity has been completely removed from many of our daily lives and most individuals have become more and more sedentary.

Historical pedometer, Southern Germany, 1590

The increased popularity and availability of these activity trackers has allowed researchers to take a closer look at the role an active lifestyle vs a sedentary one can have on several aspects of health. Using accelerometer-based activity trackers, 4,480 US adults were followed for a period of 6.6 years to determine the role of varying degrees of activity versus a sedentary lifestyle on mortality.

Participants in the study initially wore an activity tracker for a period of 7 days to break their time into three categories: sedentary time, time spent in light activity, and time spent in moderate to vigorous activity. On average all participants spent 4.2 hours/day in light activity and 1.7 hours in moderate to vigorous activity.

Over the 6.6 year observation period, a total of 700 deaths occurred. Compared with those who were sedentary 6 hours/day, mortality increased by those who were sedentary 8 hours/day by 14%, and in those who were sedentary 10 hours/day by 29%. On average, each hour of sedentary time was associated with a 12% greater risk of mortality. Inverse to this, physical activity was associated with a decrease in mortality and lessened the effects of an otherwise inactive lifestyle. Replacing just one hour of sedentary time with moderate to vigorous activity reduced the occurrence of mortality by 42%.

Obviously a fitness tracker on its own will not improve your health, fitness, or make you look any better. However, it can be used to help remind you to be active and help you make sure to meet a minimum daily goal. For those who spend a large portion of their day at a desk or otherwise sedentary, this study shows that an hour of daily exercise can go a long way helping counteract the negative effects of those sedentary hours.

Matthews CE, Keadle SK, Troiano RP, et al. Accelerometer-measured dose-response for physical activity, sedentary time, and mortality in US adults. Am J Clin Nutr. 2016;104(5):1424-1432.

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