Why walking to improve your health is not quite as straightforward as it seems

Getting people walking has proved a challenge

Although this sounds fairly easy in principle, getting people to do more exercise through walking is something that has been at the heart of public health policy in a major form since the publication ofphysical activity guidelines in 2008. These guidelines advocated at least 2.5 hours a week of moderate intensity physical activity, such as brisk walking. This target is echoed by the UK’s physical activity guidelines and those inAustralia.
The potential benefits in terms of improved public health are clear, if you consider that only 54% of adult men and 46% of adult women in the US meet the physical activity goal. Worse still, 28% or men and 32% of women reported that they had not done any physical activity that lasted more than 10 minutes in the previous week of being asked.

Getting people walking at the right level of intensity is even harder

Getting people to walk the minimum amount of time is a major challenge. The even bigger challenge comes with the part of the advice that is often ignored or simply not known or understood. In order for their to be a health benefit, the pace at which the walking is done needs to be above a certain intensity.
Although not specifically mentioned in the US Surgeon General’s “Step it Up” programme to promote walking, wearables such as those from Jawbone, Fitbit and others, are one way of tracking the number of steps walked in a day. For most users of these devices, the focus is on getting to the magical 10,000 steps a day. This isn’t really the best target to use however as to achieve the intensity guidelines to achieve a health benefit, it is only the steps that were above a certain pace that count.

The problem with the evidence

The problem with a large amount of the research done in the area of health benefits of walking is that it has been done using surveys and self-reporting which is notoriously inaccurate. Very few studies have been conducted using the “randomised controlled trial” approach to this type of scientific investigation using objective measures of activity that even consumer wearables can now provide.

As at least the US Surgeon General has made clear in his call to action, much more research is needed. Not only to make the evidence for the exact nature of the benefits clear, but also to investigate how people can be persuaded to start and stick with a programme of walking to achieve the recommended amounts of exercise. Although walking results in fewer injuries than say, running, it is not completely free of risk and so this is another area that requires more research.