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6 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): 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: Garg A, Badger D. Maximum acceptable weights and maximum voluntary isometric strengths for asymmetric lifting. Ergonomics,1986; 29: 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: 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:E 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:E Marras WS, Davis KS. Spine loading during asymmetric lifting using one versus two hands. Ergonomics,1998;41: Ekelund U.Assessment of physical activity and energy expenditure in adolescents. Dr.Philos Thesis,Karolinska Univercity Press,Stockholm,2002;pp American Heart Association. Statistical Supplement[On-line].Available: 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): Tan J, Parnianpour M, Nordin M, et al. Isometric maximal and submaximal trunk extension at different flexed position in standing. Spine,1993;18: Schultz A. Loads on the lumbar spine. In Jayson M. The lumbar spine and back Pain: Churchill Livingston;3rd ed. USA 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): Carrie M.Hall,Lori TB. Therapeutic Exercise: Moving Toward function. Philadelphia: Lippincott Williams & Wilkins;2005, 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: