Fifty-seven percent of these devices were sold by the top five brands: Fitbit, Xiaomi, Apple, Garmin, and Samsung. In 2016, vendors shipped 102 million devices worldwide, compared with 82 million in 2015. Even though there is limited evidence that using wearable fitness trackers will improve health, these devices are still popular, and new fitness devices appear on the consumer market regularly. Low PA is currently the fourth leading risk factor for mortality worldwide. Results from the Tromsø Study, the longest running population study in Norway, shows that only 30.4% of women and 22.0% of men reach the recommended target. However, 25% of adults and more than 80% of adolescents do not achieve the recommended PA targets. The World Health Organization recommends 150 min of moderate intensity physical activity (PA) each week for adults and 60 min for children and adolescents.
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