Modifying accelerometer cut-points affects criterion validity in simulated free-living for adolescents and adults
Deutscher übersetzter Titel: | Das Ändern der Schnittpunkte des Beschleunigungsmessers beeinflusst die Gültigkeit der Kriterien beim simulierten freiem Lebensraum für Jugendliche und Erwachsene |
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Autor: | Hibbing, Paul R.; Bassett, David R.; Crouter, Scott E. |
Erschienen in: | Research quarterly for exercise and sport |
Veröffentlicht: | 91 (2020), 3, S. 514-524, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0270-1367, 2168-3824 |
DOI: | 10.1080/02701367.2019.1688227 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU202102001065 |
Quelle: | BISp |
Abstract des Autors
Purpose: To assess changes in criterion validity when modifying cut-points for use in different epoch lengths. Method: Simulated free-living data came from 42 adolescents (2-hr each) and 29 adults (6-hr each) wearing a hip-worn accelerometer and portable indirect calorimeter (Cosmed K4b2). K4b2 data were classified as sedentary behavior (SB), light physical activity (LPA), or moderate-to-vigorous physical activity (MVPA), and compared to estimates from accelerometer data processed with three youth and three adult cut-points in six epoch lengths (1, 5, 10, 15, 30, and 60-s). A cut-point of 100 counts per minute was used for all SB estimates. Results: For both adolescents and adults, SB estimates in all but 60-s epochs were significantly higher than the criterion, by 18.4%–78.4% (all p < .02). CPS had varied effects on youth LPA, ranging from favorable effects for one cut-point (1.9% underestimation in 1-s epochs, versus 40.2% overestimation in the originally-calibrated epoch length; p < .01 and p = .91, respectively) to unfavorable effects for another (41.8% underestimation in 1-s epochs, versus 9.8% underestimation in the originally-calibrated epoch length; p < .01 and p = .39, respectively). Adult LPA estimates in 30-s or 60-s epochs were closest to the criterion (within 5.2%–37.3%, p = .0001–0.49). Youth MVPA estimates in 60-s epochs were closest to the criterion (within 9.5%–53.2%, all p < .05), whereas adult MVPA estimates in 1-s epochs were closest to the criterion (within 6.6%–34.2%, p = .02–0.59). Conclusion: Cut-point modification is not universally beneficial, and thus it is not recommended.