One study finds that the iPhone is not perfect to count the number of... steps
According to a study conducted by the British Columbia University, the iPhone is not perfect to calculate your daily steps, and not only for errors of the sensors.
More specifically, according to this study, in-app Activity and Health are calculated on the 21.5% of the steps in less than those actually carried out by the user.
To make the comparison, but the British Columbia University has used an iPhone and a pedometer mounted on the ankle of 31 people. The research team has also performed various laboratory tests, using a treadmill and the manual count of the steps to have an absolute measure.
In walks faster, the iPhone has registered the 5% steps in less, a difference more than acceptable even in the counter, and dedicated. In walks slower, the percentage rose to 9.4%, while in real-world use, the difference has widened to 21.5% steps less (an average of 1340 steps / day).
This difference is explained by the fact that not always a person brings to the iPhone. For example, it may happen that in the house not being counted the steps when we get closer to the refrigerator to get something to drink, or when we reach the other rooms. The same can be said in many other occasions, even at work.
The study confirms that the reading of the steps to be part of the iPhone is not perfect, but the difference of 9.4% during the walks the most the lens can be considered acceptable. If, instead, you search for a constant monitoring and precise, you have to use pedometer dedicated to always carry with us.
Link to the original article: A study finds the iPhone is not perfect to count the number of... steps