Using wearables to promote physical activity in old age : Feasibility, benefits, and user friendliness.

"Declarations Conflict of interestL.I. Schmidt, C.-P. Jansen, J. Depenbusch, M. Gabrian, M. Sieverding and H.-W. Wahl declare that they have no competing interests. All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. Conflict of interest L.I. Schmidt, C.-P. Jansen, J. Depenbusch, M. Gabrian, M. Sieverding and H.-W. Wahl declare that they have no competing interests."

"Funding This study was funded by the Innovation Fund FRONTIER of Heidelberg University as part of the Excellence Initiative."