Nicolai, SEBenzinger, PSkelton, DAAminian, KBecker, CLindemann, U2009-02-142009-02-142009-02-14201010.1123/japa.18.1.75https://infoscience.epfl.ch/handle/20.500.14299/35307WOS:000274030100006physical performance7-day activity monitoringbody-fixed sensorShort Physical Performance BatteryDoubly Labeled WaterActivity QuestionnairesActivity ThermogenesisAmbulatory SystemPrevention TrialsValidationExerciseHealthPeopleAccelerometryDay-to-Day Variability of Physical Activity of Older Persons Living in the Communitytext::journal::journal article::research article