Zusammenfassung
Die Akzelerometrie ist als objektives Messverfahren zur Erfassung körperlicher Aktivität im Feld mit guten psychometrischen Eigenschaften und Anwendbarkeit auch bei großen Stichproben international etabliert. Akzelerometer zeichnen Intensität und Dauer ein- oder mehraxialer Beschleunigungen auf. Umfänge leichter, moderater und intensiver körperlicher Aktivitäten sowie Zeiten der Inaktivität können mit Hilfe von Cut-point-Modellen abgegrenzt, sowie der Energieumsatz auf Basis von Regressionsmodellen geschätzt werden. Allerdings bleibt die Vergleichbarkeit von Ergebnissen aufgrund unterschiedlicher Modelle, Trageprotokolle, Kalibrationsverfahren und Ergebnisdarstellungen schwierig. Die vorliegenden Empfehlungen, Perspektiven und Limitationen der Messmethodik wurden unter Beteiligung aller Autoren erarbeitet und im Konsens verabschiedet.
Aktuell kann kein Gerätemodell pauschal empfohlen werden, da die Wahl des Gerätes von Forschungsfrage, -design und Zielgruppe abhängt. Für ein möglichst objektives Abbild des habituellen Bewegungsverhaltens werden ein Messzeitraum von mindestens 7 Tagen inklusive einem Wochenendtag und eine Tragedauer von mindestens 10 h pro Tag bei Erwachsenen empfohlen. Zur Vermeidung von Verzerrungen aufgrund aggregierter Daten sollten möglichst kurze Epochenlängen gewählt bzw. nicht vorprozessierte Rohwerte gespeichert werden. Für Erwachsene gilt das Cut-point-Modell von Freedson et al. (1998) zur Bestimmung unterschiedlicher Aktivitätskategorien als etabliert. Methodische Limitationen bestehen insbesondere bei der Erfassung von Aktivitäten mit geringer oder sehr hoher Beschleunigung des observierten Körpersegments, wie Fahrradfahren oder Krafttraining, und bei der Berechnung des Energieumsatzes auf Basis linearer Regressionsmodelle.
Abstract
Accelerometry is an internationally well-established procedure for the objective measurement of habitual physical activity in large samples under free-living conditions and shows good psychometric properties. Accelerometers register the intensity and duration of single or multiaxial body acceleration. The duration of light, moderate and vigorous physical activity as well as sedentary time is calculated based on cutpoint models and energy expenditure is estimated by linear regression models. Nevertheless, the comparability of results between studies remains limited due to the use of different devices, protocols, calibration procedures and presentation of results. The recommendations, perspectives and limitations of accelerometer use described here have been collated and agreed by all members of the consensus group.
Currently, there is no evidence for recommending a specific accelerometer model as model selection depends on the study question, target groups and study design. To obtain objective information on habitual physical activity behavior, a minimum wear time of 7 consecutive days with a minimum of 10 h/day including one weekend day is recommended. To avoid bias the selected epoch length should be as short as possible or raw data should be recorded. For adults, the cutpoint model of Freedson et al. (1998) for estimating different activity categories is well accepted. Methodological limitations include the recognition of activities with limited body acceleration, such as bicycling or weight training and the estimation of energy expenditure using only linear regression models.
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L. Gabrys, C. Thiel, A. Tallner, B. Wilms, C. Müller, D. Kahlert, D. Jekauc, F. Frick, H. Schulz, O. Sprengler, S. Hey, S. Kobel und L. Vogt geben an, dass kein Interessenkonflikt besteht.
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Gabrys, L., Thiel, C., Tallner, A. et al. Akzelerometrie zur Erfassung körperlicher Aktivität. Sportwiss 45, 1–9 (2015). https://doi.org/10.1007/s12662-014-0349-5
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DOI: https://doi.org/10.1007/s12662-014-0349-5