1. Wiley M, Damiano D. Lower-extremity strength profiles in spastic cerebral palsy. Dev Med Child Neurol. 1998; 40: 100–7.
2. Eek M, Tranberg R, Beckung E. Muscle strength and kinetic gait pattern in children with bilateral spastic CP. Gait Posture. 2011; 33: 333–7.
3. de Groot S, Dallmeijer A J, Bessems P J, Lamberts M L, van der Woude L H, Janssen T W. Comparison of muscle strength, sprint power and aerobic capacity in adults with and without cerebral palsy. J Rehabil Med. 2012; 44(11): 932-8.
4. Carlberg E B, Hadders-Algra M. Postural dysfunction in children with cerebral palsy: Some implications for therapeutic guidance. Neural Plast. 2005; 12(2-3): 221–8.
5. Burtner P A, Woollacott M, Craft G, Roncesvalles M. The capacity to adapt to changing balance threats: A comparison of children with cerebral palsy and typically developing children. Dev Neurorehabil. 2007; 10(3): 249–60.
6. Prosser L A, Lee S C K, VanSant A F, Barbe M F, Lauer R T. Trunk and hip muscle activation patterns are different during walking in young children with and without cerebral palsy. Phys Ther. 2010; 90(7): 986–97.
7. Kembhavi G, Darrah J, Magill-Evans J, Loomis J. Using the berg balance scale to distinguish balance abilities in children with cerebral palsy. Pediatr Phys Ther. 2002; 14(2): 92-9.
8. Woollacott M H, Burtner P A, Jensen J L, Jasiewicz J, Roncesvalles N, Sveistrup H. Development of postural responses during standing in healthy children and children with spastic diplegia. Neurosci Biobehav R. 1998; 22(4): 583–9.
9. Miranda P, Lomarev M, Hallett M. Modeling the current distribution during transcranial direct current stimulation. Clin Neurophysiol. 2006; 117: 1623–9.
10. McGinley J L, Pogrebnoy D, Morgan P. Mobility in ambulant adults with Cerebral Palsy challenges for the future. In E. Svraka (Ed,), Cerebral Palsy - Challenges for the Future.Intechopen.com; 2014. p. 75-96.
11. Morton J F, Brownlee M, McFadyen A K. The effects of progressive resistance training for children with cerebral palsy. Clin Rehabil. 2005; 19(3): 283-9.
12. Katz-Leurer M, Rotem H, Keren O, Meyer S. The effects of a "home-based" task-oriented exercise programme on motor and balance performance in children with Spastic Cerebral Palsy and severe traumatic brain injury. Clin Rehabil. 2009;23(8):714-24.
13. Kurz M J, Corr B, Stuberg W, Volkman K G, Smith N. Evaluation of lower body positive pressure supported treadmill training for children with cerebral palsy. Pediatr Phys Ther. 2011; 23(3): 232-9.
14. Connor M, Moulton S, Lobb B M, Peterson A L. The relationship between strength and balance in individuals with Parkinson’s Disease. J Neurol Disord. 2015; 3:239.
15. Wolfson L, Judge J, Whipple R, King M. Strength is a major factor in balance, gait, and the occurrence of falls. J Gerontol A Biol Sci Med Sci. 1995; 50: 64-7.
16. Granacher U, Gollhofer A. Is there an association between variables of postural control and strength in prepubertal children? J Strength Cond Res. 2012; 26(1): 210-6.
17. Muehlbauer T, Gollhofer A, Granacher U. Relationship between measures of balance and strength in middle-aged adults. J Strength Cond Res. 2012; 26: 2401-7.
18. Dewar R, Love S, Johnston L. Exercise interventions improve postural control in children with Cerebral Palsy: A systematic review. Dev Med Child Neurol. 2014; 57(6): 504-20.
19. Plasiano R, Rosenbaum P, Waller S, Russel D, Wood E, Galuppi B. Development and reliability of a system, to classiffy gross motor function in children with cerebral palsy. Dev Med Child Neurol. 1997; 39: 214-23.
20. Rethlefsen S A, Ryan D D, Kay R M. Classification systems in cerebral palsy. Orthop Clin N Am. 2010; 41: 457–67.
21. Rosenbaum P L, Palisano R J, Bartlett D J, Galuppi B E, Russell D J. Development of the gross motor function classification system for Cerebral Palsy. Dev Med Child Neurol. 2008; 50(4): 249-53.
22. McCormick A, Brien M, Plourde J, Wood E, Rosenbaum P, McLean J. Stability of the gross motor function classification system in adults with Cerebral Palsy. Dev Med Child Neurol Suppl. 2007; 49(4): 265-9.
23. Palisano R, Rosenbaum P, Bartlett D, Livingston M. Content validity of the expanded and revised gross motor function classification system. Dev Med Child Neurol. 2008; 50(10): 744-50.
24. Silva D B, Pfeifer L I, Funayama C A. Gross motor function classification system expanded & revised (GMFCS E & R): Reliability between therapists and parents in Brazil. Braz J Phys Ther. 2013; 17(5): 458-63.
25. Willemse L, Brehm M A, Scholtes V A, Jansen L, Woudenberg-Vos H, Dallmeijer A J. Reliability of isometric lower-extremity muscle strength measurements in children with cerebral palsy: Implications for measurement design. Phys Ther. 2013; 93(7): 935-41.
26. Franjoine M R, Gunther J S, Taylor M J. Pediatric balance scale: A modified version of the berg balance scale for the school-age child with mild to moderate motor impairment. Pediatr Phys Ther. 2003; 15(2): 114-28.
27. Granacher U, Gollhofer A. Is there an association between variables of postural control and strength in adolescents? J Strength Cond Res. 2011; 25(6): 1718-25.
28. McCurdy K, Langford G. The relationship between maximum unilateral squat strength and balance in young adult men and women. J Sport Sci Med. 2006; 5(2): 282-8.
29. Granacher U, Gruber M, Gollhofer A. Force production capacity and functional reflex activity in young and elderly men. Aging -Clin Exp Res. 2010; 22(5-6): 374-82.
30. Muehlbauer T, Gollhofer A, Granacher U. Associations between measures of balance and lower-extremity muscle strength/ power in healthy individuals across the lifespan: A systematic review and meta-analysis. Sports Med. 2015; 45(12): 1671-92.
31. Jafarnezhadgero H, Norasteh A A. Evaluation of relationship between hip, knee and trunk extensor muscles strength with balance in boys aged from 13-15 years. Studies in Sport Medicine. 2014; 14(5): 109-20. (In Persian).
32. Ebrahimi Atri A, Sarvari F, Saeedi M, Sokhangu M K. Relationship between lower extremity muscle strength and dynamic balance in women with Multiple Sclerosis (MS). Journal of Research in Rehabilitation Sciences. 2013; 9(1): 20-7. (In Persian).
33. Akbari A, Karimi H, Ghobae M. The relationship between lower extremity muscle strength and functional abilities in patients with hemiparesis. Journal of Kermanshah University of Medical Sciences. 2006; 10(1): 40-8. (In Persian).
34. Geiger R A, Allen J B, O'Keefe J, Hicks R R. Balance and mobility following stroke: Effects of physical therapy interventions with and without biofeedback/ forceplate training. Physi Ther. 2001; 81(4): 995-1005.
35. Shumway-Cook A W M. Normal postural control in motor control; Translating research into clinical practice. 4th ed. Baltimore: Lippincott Williams & Wilki; 2012; 157-86.
36. Sharif-Moradi K, Farah-Pour N. Comparison of the balance performance of the children with Spastic Cerebral Palsy before and after exercise therapy program. Journal of Rehabilitation. 2006; 7(1): 22-8. (In Persian).
37. Kuczynski M. Task related changes in biomechanical properties of ankle joint during standing. IN: Lornecki, S. XI IBS Seminar; 1999, 10:154-160.
38. Duarte N D A C, Collange Grecco L A, Franco R C, Zanon N, Oliveira C S. Correlation between pediatric balance scale and functional test in children with Cerebral Palsy. J Phys Ther Sci. 2014; 26(6): 849–53.
39. Goulding A, Jones I, Taylor R, Piggot J, Taylor D. Dynamic and static tests of balance and postural sway in boys: Effects of previous wrist bone fractures and high adiposity. Gait Posture. 2003; 17(2): 136-41.