CC BY-NC-ND 4.0 · Sports Med Int Open 2017; 1(04): E141-E146
DOI: 10.1055/s-0043-113999
Training & Testing
Eigentümer und Copyright ©Georg Thieme Verlag KG 2017

Intra- and Inter-Day Reliability of Body Composition Assessed by a Commercial Multifrequency Bioelectrical Impedance Meter

Laurent Bosquet
1  Université de Poitiers, Faculté des sciences du sport, Poitiers, France
,
Thomas Niort
2  Universite de Poitiers, Sport sciences, Poitiers, France
,
Maxime Poirault
2  Universite de Poitiers, Sport sciences, Poitiers, France
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Publikationsverlauf

received 19. Februar 2017
revised 27. April 2017

accepted 09. Juni 2017

Publikationsdatum:
14. Juli 2017 (online)

  

Abstract

The purpose of this study was to examine the intra- and inter-day reliability of body composition measurements provided by a commercial multifrequency bioelectrical impedance meter. Eighteen healthy, well-trained students in physical education from the same ethnic group were assessed on four consecutive days, both in the morning and in the evening. Indexes provided by the device were gathered in four categories: tissular, metabolic, hydric and ionic blocks. There was no systematic bias between repeated measures, regardless of time of day. Relative reliability was high to very high in the morning (0.72<ICC<0.99) and moderate to very high in the afternoon (0.61<ICC<0.99). Absolute reliability varied substantially between indexes (1.5%<SEM<15%). The minimum difference considered as real was proportionally altered, since it ranged from 4.2 to 41.5%. In conclusion, body composition assessed with a multifrequency bioelectrical impedance meter requires a highly standardized protocol and adjusting the cut-off value for each parameter to ascertain during athlete follow-up that a real change has occurred. This assessment should preferably be scheduled in the morning in order to decrease these cut-off values.