title: Critique of: "Physical Activity Assessment Between Consumer- and Research-Grade Accelerometers: A Comparative Study in Free-Living Conditions".
authors.affiliation: Faculty of Sport Sciences, PROFITH "PROmoting FITness and Health through physical activity" research group. Department of Physical Education and Sports, University of Granada, Granada, Spain.
authors.forename: Jairo H
authors.identifier: http://orcid.org/0000-0003-0366-6935
authors.initials: JH
authors.lastname: Migueles
authors.affiliation: Faculty of Sport Sciences, PROFITH "PROmoting FITness and Health through physical activity" research group. Department of Physical Education and Sports, University of Granada, Granada, Spain.
authors.forename: Cristina
authors.identifier: http://orcid.org/0000-0002-4513-9108
authors.initials: C
authors.lastname: Cadenas-Sanchez
authors.affiliation: Faculty of Sport Sciences, PROFITH "PROmoting FITness and Health through physical activity" research group. Department of Physical Education and Sports, University of Granada, Granada, Spain.|Karolinska Institutet, Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.
authors.forename: Francisco B
authors.identifier: http://orcid.org/0000-0003-2001-1121
authors.initials: FB
authors.lastname: Ortega
keywords: Fitbit; actigraphy; activity tracker; aerobic exercise; physical activity; validity