Comparison of accelerometer cut points for predicting activity intensity in youth.

By Stewart G. Trost, P. Loprinzi, Rebecca W. Moore, Karin A. Pfeiffer. Medicine & Science in Sports & Exercise, 2011

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Objectively measured physical activity and sedentary time in youth: the International children’s accelerometry database (ICAD) (2015, methodology): “Whilst the thresholds used have been shown to provide valid estimates of physical activity intensity for youth aged 5 years and above [36], more recently they have been shown to perform poorly for MVPA in children aged 4–6 years [37] and have not been validated in children under 4 years.”
Age group comparability of raw accelerometer output from wrist- and hip-worn monitors. (2014, background): “Finally, it has been suggested that the single-regression equation developed to calculate intensity thresholds is not able to accurately predict time spent in different intensities across a wide range of activities (16,19,36).”
Systematic review of the relationships between objectively measured physical activity and health indicators in school-aged children and youth. (2016, background): “…Marshall and Ramirez 2011) and the widespread use of subjective assessments of PA (Reilly et al. 2008; Adamo et al. 2009; Janssen and LeBlanc 2010; Trost et al. 2011), which cannot accurately capture LPA (e.g., various incidental activities accumulated throughout the day) (Hamilton et al. 2004;…”