TY - JOUR T1 - Self-regulated use of a wearable activity sensor is not associated with improvements in physical activity, cardiometabolic risk or subjective health status JF - British Journal of Sports Medicine JO - Br J Sports Med DO - 10.1136/bjsports-2017-098512 SP - bjsports-2017-098512 AU - Saurabh S Thosar AU - Meike Niederhausen AU - Jodi Lapidus AU - Nora F Fino AU - Joaquin Cigarroa AU - Jessica Minnier AU - Sandra Colner AU - Asha Nayak AU - Luke J Burchill Y1 - 2017/12/08 UR - http://bjsm.bmj.com/content/early/2017/12/08/bjsports-2017-098512.abstract N2 - Physical activity (PA) trackers are a pervasive feature of modern life. It is expected that by 2020, sales of wearable devices will reach approximately 300 million users1 many with the intention of increasing activity by tracking daily step count and other measures of PA. We assessed whether self-regulated use of a commercial PA tracker without prescribed goals improved (1) PA, (2) cardiometabolic (CM) risk factors or (3) subjective health status (SHS).We recruited 431 healthy, mostly white (59%) male (61%) volunteers aged 41±9 years (mean±SD), body mass index (BMI) 28±6 kg/m2 (23.6% obese) from a common worksite in North America to wear a commercial PA tracker for 6 months. Behaviour and PA change goals were not prescribed. Participants did not receive any compensation but kept the PA tracker at study completion. The wrist-worn PA tracker (Basis Peak) incorporated standard technology including an optical sensor and 3-axes accelerometer and was synchronised to participants’ mobile devices enabling them to follow their PA. Raw accelerometer data from the PA tracker was collected and compiled by … ER -