B. Choi, P. Schnall, H. Yang, M. Dobson, P. Landsbergis et al., Sedentary work, low physical job demand, and obesity in US workers, American Journal of Industrial Medicine, vol.12, issue.(suppl 8), pp.1088-1101, 2010.
DOI : 10.1002/ajim.20886

C. Craig, A. Marshall, M. Sjöström, A. Bauman, M. Booth et al., International Physical Activity Questionnaire: 12-Country Reliability and Validity, Medicine & Science in Sports & Exercise, vol.35, issue.8, pp.1381-1395, 2003.
DOI : 10.1249/01.MSS.0000078924.61453.FB

L. De-jonge, J. Delany, T. Nguyen, J. Howard, E. Hadley et al., Validation study of energy expenditure and intake during calorie restriction using doubly labelled water and changes in body composition, Am J Clin Nutr, vol.85, pp.73-79, 2007.

G. Rodriguez, L. Béghin, L. Michaud, L. Moreno, D. Turck et al., Comparison of the TriTrac-R3D accelerometer and a self-report activity diary with heart-rate monitoring for the assessment of energy expenditure in children, British Journal of Nutrition, vol.40, issue.06, pp.623-631, 2002.
DOI : 10.1097/00005768-199906000-00022

D. Bond, J. Jakicic, J. Unick, S. Vithiananthan, D. Pohl et al., Pre- to Postoperative Physical Activity Changes in Bariatric Surgery Patients: Self Report vs. Objective Measures, Obesity, vol.36, issue.12, pp.2395-2397, 2010.
DOI : 10.1038/oby.2010.88

R. Shephard, Limits to the measurement of habitual physical activity by questionnaires * Commentary, British Journal of Sports Medicine, vol.37, issue.>3, pp.197-206, 2003.
DOI : 10.1136/bjsm.37.3.197

K. Coleman, B. Saelens, M. Wiedrich-smith, J. Finn, and L. Esptein, Relationships between TriTrac-R3D vectors, heart rate, and self-report in obese children, Medicine &amp Science in Sports &amp Exercise, vol.29, issue.11, pp.1535-1542, 1997.
DOI : 10.1097/00005768-199711000-00022

K. Chen and D. Bassett, The Technology of Accelerometry-Based Activity Monitors: Current and Future, Medicine & Science in Sports & Exercise, vol.37, issue.Supplement, pp.490-500, 2005.
DOI : 10.1249/01.mss.0000185571.49104.82

L. Béghin, M. Castera, Y. Manios, C. Gilbert, M. Kersting et al., Quality assurance of ethical issues and regulatory aspects relating to good clinical practices in the HELENA Cross-Sectional Study, International Journal of Obesity, vol.14, pp.12-18, 2008.
DOI : 10.1207/s15327019eb1403_3

P. Freedson, E. Melanson, and J. Sirard, Calibration of the Computer Science and Applications, Inc. accelerometer, Medicine & Science in Sports & Exercise, vol.30, issue.5, pp.777-781, 1998.
DOI : 10.1097/00005768-199805000-00021

J. Bland and D. Altman, Statistical methods for assessing agreement between two methods of clinical measurement, International Journal of Nursing Studies, vol.47, issue.8, pp.307-310, 1986.
DOI : 10.1016/j.ijnurstu.2009.10.001

J. Vanhelst, L. Béghin, P. Rasoamanana, D. Theunynck, T. Meskini et al., Calibration of the RT3 accelerometer for various patterns of physical activity in children and adolescents, Journal of Sports Sciences, vol.36, issue.4, pp.381-387, 2010.
DOI : 10.1038/sj.ijo.0800810

M. Treuth, K. Schmitz, D. Catellier, R. Mcmurray, D. Murray et al., Defining accelerometer thresholds for activity intensities in adolescent girls, Med Sci Sports Exer, vol.36, pp.1259-1266, 2004.

M. Puyau, A. Adolph, F. Vohra, and N. Butte, Validation and Calibration of Physical Activity Monitors in Children, Obesity Research, vol.11, issue.Suppl, pp.150-157, 2002.
DOI : 10.1038/oby.2002.24

K. Evenson, D. Catellier, K. Gill, K. Ondrak, and R. Mcmurray, Calibration of two objective measures of physical activity for children, Journal of Sports Sciences, vol.36, issue.14, pp.1557-1565, 2008.
DOI : 10.1080/02640410802334196

J. Nichols, C. Morgan, J. Sarkin, J. Sallis, and K. Calfas, Validity, reliability, and calibration of the Tritrac accelerometer as a measure of physical activity, Medicine & Science in Sports & Exercise, vol.31, issue.6, pp.908-912, 1999.
DOI : 10.1097/00005768-199906000-00022

P. Freedson, E. Melanson, and J. Sirard, Calibration of the Computer Science and Applications, Inc. accelerometer, Medicine & Science in Sports & Exercise, vol.30, issue.5, pp.777-781, 1998.
DOI : 10.1097/00005768-199805000-00021

J. Lötjönen, I. Korhonen, K. Hirvonen, S. Eskelinen, M. Myllymäki et al., Automatic sleep-wake and nap analysis with a new wrist worn online activity monitoring device vivago WristCare, Sleep, vol.26, pp.86-90, 2003.

S. Zhang, A. Rowlands, P. Murray, and T. Hurst, Physical Activity Classification Using the GENEA Wrist-Worn Accelerometer, Medicine & Science in Sports & Exercise, vol.44, issue.4, pp.742-748, 2012.
DOI : 10.1249/MSS.0b013e31823bf95c

J. Rey-lópez, J. Ruiz, G. Vicente-rodríguez, L. Gracia-marco, Y. Manios et al., Physical activity does not attenuate the obesity risk of TV viewing in youth, Pediatric Obesity, vol.12, issue.3
DOI : 10.1111/j.2047-6310.2011.00021.x

J. Ruiz, F. Ortega, D. Martínez-gómez, I. Labayen, L. Moreno et al., Objectively Measured Physical Activity and Sedentary Time in European Adolescents: The HELENA Study, American Journal of Epidemiology, vol.174, issue.2, pp.173-184, 2011.
DOI : 10.1093/aje/kwr068

J. Vanhelst, G. Zunquin, D. Theunynck, J. Mikulovic, G. Bui-xuan et al., Equivalence of accelerometer data for walking and running: Treadmill versus on land, Journal of Sports Sciences, vol.36, issue.7, pp.669-675, 2009.
DOI : 10.1016/S0197-2456(99)00052-5

A. Rowlands, P. Thomas, and R. Eston, Topping R: Validation of the RT3 triaxial accelerometer for the assessment of physical activity