Predictive validity of accelerometer prediction equations for energy expenditure (EE) during overland walking and running in children and adolescents
Trost, Stewart G., Way, Rebecca, & Okely, Anthony (2004) Predictive validity of accelerometer prediction equations for energy expenditure (EE) during overland walking and running in children and adolescents. In Medicine and Science in Sports and Exercise, Lippincott, Williams & Wilkins, Indianapolis, Indiana, s197.
The aim of this study was to assess the predictive validity of three accelerometer prediction equations (Freedson et aL, 1997; Trost et aL, 1998; Puyau et al., 2002) for energy expenditure (EE) during overland walking and running in children and adolescents.
45 healthy children and adolescents aged 10-18 completed the following protocol, each task 5-mins in duration, with a 5-min rest period in between; walking normally; walking briskly; running easily and running fast. During each task participants wore MTI (WAM 7164) Actigraphs on the left and right hips. VO2 was monitored breath by breath using the Cosmed K4b2 portable indirect calorimetry system. For each prediction equation, difference scores were calculated as EE measured minus EE predicted. The percentage of 1-min epochs correctly categorized as light (<3 METs), moderate (3-5.9 METs), and vigorous (≥6 METS) was also calculated.
The Freedson and Trost equations consistently overestimated MET level. The level of overestimation was statistically significant across all tasks for the Freedson equation, and was significant for only the walking tasks for the Trost equation. The Puyau equation consistently underestimated AEE with the exception of the walking normally task. In terms of categorisation, the Freedson equation (72.8% agreement) demonstrated better agreement than the Puyau (60.6%).
These data suggest that the three accelerometer prediction equations do not accurately predict EE on a minute-by-minute basis in children and adolescents during overland walking and running. However, the cut points generated by these equations maybe useful for classifying activity as either, light, moderate, or vigorous.
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|Item Type:||Conference Paper|
|Additional Information:||abstract number: 1389|
|Keywords:||Accelerometer prediction equations, Energy expenditure, Children, Adolescents|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
|Deposited On:||10 Jun 2014 01:18|
|Last Modified:||17 Jun 2014 05:30|
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