##Samavati Sاarif M A, Nikbakht H A, Nazem F, Farahpour N. (2003). The effects of submaximal training in crawl swimming with controlled breathing frequencies (hypoxia) on CPK and LDH enzymes, Vo2max and performance of young swimmers. Harakat; (15):55-70. [Persian]##Nikbakht H, Ebrahim K H, Azimi N. (2012). The effect of training with swim paddle in back stroke swimming on aerobic & anaerobic capacity of swimmers. Sport Physiology (Research on Sport Science); 4(15): 51-69. [Persian]##Heinlein S, Cosgarea A. (2010). Biomechanical considerations in the competitive swimmer’s shoulder. Sports Health: A Multidisciplinary Approach, (2):519–525.##Johnson J N, Gauvin J, Fredericson M. (2003). Swimming biomechanics and injury prevention: new stroke techniques and medical considerations. Phys Sport Med; 31(1):41-46.##Coulson M. (1997). Freestyle Swimming. Available from: http://www.brianmac.co. uk/swimming/freestyle.htm.##Kibler W B. (1998). The role of the scapula in athletic shoulder function. Ame J of Sports Med; 26(2): 325-337.##Fig, G. (2005). Sport-specific conditioning: Strength training for swimmers: Training the core. Strength Cond J; 27(2): 40-42.##Troup J. (1999). The physiology and biomechanics of competitive swimming. Clin sport Med; 18(2): 267-288.##Hibbs  A E. (2011). Development and evaluation of a core training programme in highly trained swimmers. Unpublished PhD Thesis. Teesside University; 32-35.##Scibek  J S, Guskiewicz  K M, Prentice W E, Mays S, Davis J M. (2001). The effects of core stabilization training on functional performancein swimming. Unpublished Master’s Thesis, University of NorthCarolina. Chapel Hill; 47-59.##Santana J. (2003). Sport-specific conditioning: The serape effect - A kinesiological model for core training. Strength Cond J; 25(2): 73-74.##Nesser T W, Huxel K C, Tincher J L, Okado T. (2008). The relationship between core stability and performance in Division I football players. J Strength Cond Res; 22(6):1750-1754.##Nesser T, Lee W. (2009). The relationship between core strength and performance in division i female soccer players. J Exerc Physiol; 12(2): 21-28.##Okada T, Huxel K, Nesser T. (2011). Relationship between core stability functional movement and performance. J Strength Cond Res; 25(1):252-61.##Kroff J. (2005). The relationship between respiratory muscle fatigue, core stability, kinanthropometric attributes and endurance performance in competitive kayakers. Thesis presented in the partial fulfillment of the requirements for the degree of Master of Medical Sciences at Stellenbosch University; 72-88.##Dendas  A M. (2010). The relationship between core stability and athletic performance. A Thesis Presented to The Faculty of Kinesiology In Partial Fulfillment of the Requirements for the Degree Master of Science In Kinesiology: Exercise Science. Humboldt State University; 56-65.##Sato K, Mokha M. (2009). Does core strength training influence running kinetics, lower-extremity stability, and 5000-M performance in runners? J Strength Cond Res; 23(1):133-140.##Stanton R, Reaburn P R, Humphries B. (2004). The effects of short- term Swiss ball training on core stability and running economy. J Strength Cond Res; 18: 522–528.##Tse M A, McManus M A, Masters R S. (2005). Development and validation of a core endurance intervention program: Implications for performance in college age rowers. J Strength Cond Res; 19:547-552.##Kibler W B, Press J, Sciascia A. (2006). The role of core stability in athletic function. Sports Med; 36(3): 189-198.##Tate A, Turner G N, Knab S E, Jorgensen C, Strittmatter A, Michener L A. (2012). Risk factors associated with shoulder pain and disability across the lifespan of competitive swimmers. J Athl Train; 47(2):149-158.## Akuthota V, Nadler S F. (2004). Core strengthening. Arch Phys Med Rehabil, 85: 86-92.## Leinonen V, Kankaanpää M, Airaksinen O, Hänninen O. (2000). Back and hip extensor activities during trunk flexion/extension: effects of low back pain and rehabilitation. Arch Phys Med Rehabil; 81(1):32-37.## Brandon R. (2006). Core training menus, in core stability: injury free performance. J. Taylor, Editor, Pye, J.A: London, 57-90.## McGill S M. (2001). Lower back stability: from formal description to issues for performance and rehabilitation. Exerc Sport Sci; 29: 26–31.## Gaeini AA, Arazi H, Memari S, Lary F. (2005). Relationship among anthropometric characteristics and sprint & endurance performance in Iran elite male swimmers. Research on sport science; 3(7):45-58. [Persian]##Troup J. (1999). The physiology and biomechanics of competitive swimming. Clin Sports Med; 18(2): 267-288.## Arazi H, Ebrahimi, M. (2011). The Effect of Two Weight Training Programs with Different Fatigue on Strength Gains. Journal of applied exercise physiology (journal of sports science); 7(13): 55-64. [Persian]## Hamedi nia MR, Azimi Taraghdari H, Haghighi AH. (2010). A comparison of reverse linear and daily undulating periodized resistance programs with equated volume and intensity on endurance of untrained men. Journal of applied exercise physiology (journal of sports science); 6(12): 119-132. [Persian]## Clarys J P, Cabri J. (1993). Electromyography and the study of sports movements: A review. J sport sci; 11: 379-448.## Hibbs A E, Thompson K G, French D, Wrigley A, Spears I. (2008). Optimizing performance by improving core stability and core strength. Sports Med; 38(12):995-1008.##  Sharrock C, Cropper J, Mostad J, Johnson M, Malone T. (2011). A pilot study of core stability and athletic performance: is there a relationship? Int J Sports Phys Ther; 6(2):63-74.##