McBrearty, D., McCrorie, P., Granat, M., Duncan, E., & Stansfield, B. (2014). Objective assessment of intensity categorization of the previous day physical activity recall questionnaire in 11–13 year old children. Physiological Measurement, 35(11), 2329-2342. https://doi.org/10.1088/0967-3334/35/11/2329