Greg Foot investigates the so-called wonder products making bold claims.
to count how many steps we are taking each day. But will these popular devices, often worn like a watch on your arm, really keep us on track towards our fitness goals?
Step counts are measured using an accelerometer, a sensor that can detect movement in all three directions – up and down, side-to-side and back and forward. The device uses a complex algorithm based on decades of testing to interpret certain patterns of movements as a single 'step'. Measuring your stress levels is a bit more complicated. The device measures your heart rate variability – the variation in time between beats of the heart – to see how well it adapts to increased stress. James says a higher amount of variability demonstrates your body is having the correct physiological reaction to stressful conditions.
Active heart rate was by far the most accurate measurement across the board, with even the cheapest device registering a consistent reading. Ironically, resting heart rate was more difficult. Both the cheapest and one of the most expensive devices measured a heart rate almost twice that of the chest strap. Step count was consistent between every device, except for one watch that added a massive 20% to the real step count.
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