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12 REFRENCES 1-Davis KG, Marras WS. Assessment of the relationship between box weight and trunk kinematics: Does a reduction in box weight necessarily correspond to a decrease in spinal loading? Human factors, 2000; 42(2):95-208. 2- Maul I, Laubli T, Oliveri M, Krueger H. Long-term effects of supervised physical training in secondary prevention of low back pain. Eur Spine J(2005);14:599-611. 3-Garg A, Badger D. Maximum acceptable weights and maximum voluntary isometric strengths for asymmetric lifting. Ergonomics,1986; 29:879-92. 4-Sheikhzadeh A, Parnianpour M, Nordin M. Capability and recruitment patterns of trunk during isometric uniaxial and biaxial upright exertion. Clin Biomech (Bristol, Avon),2008;23:527-35. 5-Mousavi SJ, Olyaei GH, Talebian S, et al. The effect of angle and level of exertion on trunk neuromuscular performance during multidirectional isometric activities. Spine,2009; 34:E170-7. 6-Talebian S, Mousavi SJ, Olyaei GR, et al. The effect of exertion level on activation patterns and variability of trunk muscles during multidirectional isometric activities in upright posture. Spine,2010;35:E443-451. 7-Marras WS, Davis KS. Spine loading during asymmetric lifting using one versus two hands. Ergonomics,1998;41:817-834. 8- Ekelund U.Assessment of physical activity and energy expenditure in adolescents. Dr.Philos Thesis,Karolinska Univercity Press,Stockholm,2002;pp.1-46. 9-American Heart Association. Statistical Supplement[On-line].Available: http://www.amhrt.org/scientific/ HSstats9808 rskfct. html,(1998). 10- Pope MHp, Andersson GBp, Broman H et al. Electromyographic studies of the lumbar trunk musculature during the development of axial torques. J Orthop Res,1986;4(3):288-97. 11- Tan J, Parnianpour M, Nordin M, et al. Isometric maximal and submaximal trunk extension at different flexed position in standing. Spine,1993;18:2480-90. 12- Schultz A. Loads on the lumbar spine. In Jayson M. The lumbar spine and back Pain: Churchill Livingston;3rd ed. USA 1987. 13- Ng JKp, Parnianpour Mp, Richardson CA et al. Functional roles of abdominal and back muscles during isometric axial rotation of the trunk. J Orthop Res,2001;19(3):463-71. 14-Carrie M.Hall,Lori TB. Therapeutic Exercise: Moving Toward function. Philadelphia: Lippincott Williams & Wilkins;2005,151. 15- Sadeghi M, Shadmehr A, Bagheri H, Talebian S, Olyaei GR, Jalaie SH. Movement pattern & motor output during resisted trunk three dimensional motions. Journal of Modern Rehabilitation, 2009; 3(1,2):5. 16-Gunedi Z, Taskiran O,Beyazova M. What is the optimal repetition number in electromyographic reaction time studies?clinical Biomechanics, 2005;20:754-758.