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Wearable activity monitors have become important tools for objective physical activity assessment in free-living conditions. Over the last decade, the use of accelerometer technologies in physical activity monitoring has increased rapidly and researchers have developed novel processing methods to improve physical activity estimation. Additionally, best practices for using accelerometer-based activity monitors have also been established to ensure data quality and comparability across different studies. Current technological advances have resulted in miniaturization of accelerometer-based activity monitors along with improved memory capacity and sampling rate. Technological advances in combination with novel processing techniques has yielded economical and increasingly accessible applications of accelerometers to measure physical activity in large-scale studies. In view of this, the purpose of the present …