The primary purpose was to examine changes in balance, lower extremity (LE) power and flexibility following 10 weeks of taekwondo (TKD) training and to determine if this was different in children classified as healthy weight (HW) and overweight (OW)/obese. Participants included 17 children (HW: n = 11, OW/obese: n = 6). Data were collected on balance, LE power and flexibility at baseline and 10 weeks. Balance was assessed with eyes open in normal (NSEO), tandem (TSEO), single (SLEO) stances and with eyes closed for normal (NSEC) and tandem (TSEC) stances. Center of pressure displacements in mediolateral (Xavg) and anteroposterior (Yavg) directions; and average velocity (Vavg) were calculated. Analyses included two-way ANOVA and Mann Whitney U tests (P < 0.05). Balance data indicated significant interaction effects for Xavg in NSEO, Yavg in TSEO; time effects for Yavg in NSEO, NSEC and SLEO and Vavg in SLEO conditions. A significant group effect was shown for Vavg in the NSEO, NSEC and TSEO and for Yavg in TSEC conditions. Flexibility decreased significantly with TKD. Findings suggest that 10 weeks of TKD training may improve balance in children, and OW/obese group may have greater improvements in balance with eyes open compared to their peers.


Childhood obesity, Physical activity, Martial arts,


  1. C.L. Ogden, M.D. Carroll, K.M. Flegal, High body mass index for age among US children and adolescents, 2003-2006, JAMA, 299 (2008) 2401- 2405.
  2. C.L. Ogden, M.D. Carroll, B.K. Kit, K.M. Flegal, Prevalence of childhood and adult obesity in the United States, 2011-2012, JAMA, 311 (2017) 806-814.
  3. C.L. Ogden, M.D. Carroll, B.K. Kit, K.M. Flegal, Prevalence of obesity and trends in body mass index among US children and adolescents, 1999-2010, JAMA, 307 (2012) 483-490.
  4. T. Lobstein, L. Baur, R. Uauy, Obesity in children and young people: a crisis in public health, Obesity Reviews, 5 Suppl 1:4-104, 2004.
  5. M.I. Goran, K.D. Reynolds, C.H. Lindquist, Role of physical activity in the prevention of obesity in children, International Journal of Obesity and Related Metabolic Disorders, 23 (1999) S18- 33.
  6. US Department of Health and Human Services. Physical activity guidelines for Americans, 2008. http://www.health.gov.
  7. Office of the Surgeon General (US); Office of Disease Prevention and Health Promotion (US); Centers for Disease Control and Prevention (US); National Institutes of Health (US). The Surgeon General’s Call to Action to Prevent and Decrease Overweight and Obesity. Rockville, MD: Office of the Surgeon General (US); 2001
  8. S.L. Gortmaker, R.M. Lee, R.S. Mozaffarian, A.M. Sobol, T.F. Nelson, B.A. Roth, J.L. Wiecha, Effect of an after-school intervention on increases in children's physical activity, Medicine and Science in Sports and Exercise, 44 (2012) 450-457.
  9. C.R. Burgeson, H. Wechsler, N.D. Brener, J.C. Young, C.G. Spain, Physical education and activity: results from the School Health Policies and Programs Study 2000, Journal of School Health, 71 (2001) 279-293.
  10. Joe Marshall, Ken Hardman, The state and status of physical education in schools in international context, European Physical Education Review, 6 (2000) 203-229.
  11. R.L. Cromwell, P.M. Meyers, P.E. Meyers, R.A. Newton Tae Kwon Do: an effective exercise for improving balance and walking ability in older adults, The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences, 62 (2007) 641-646.
  12. R.E. Lane, Physiotherapy in the treatment of balance problems, Physiotheraphy, 55 (1969) 415-420.
  13. S.L. Cornbleet, N.B. Woolsey, Assessment of hamstring muscle length in school-aged children using the sit-and-reach test and the inclinometer measure of hip joint angle, Physical Therapy, 76 (1996) 850-855.
  14. B.W. Landry, S.W. Driscoll, Physical activity in children and adolescents, PM & R, 4 (2012) 826- 832.
  15. M.M. Probst, R. Fletcher, D.S. Seelig, A comparison of lower-body flexibility, strength, and knee stability between karate athletes and active controls, Journal of Strength and Conditioning Research, 21 (2007) 451-455.
  16. M.N. Zetaruk, M.A. Violan, D. Zurakowski, L.J. Micheli, Injuries in martial arts: a comparison of five styles, British Journal of Sports Medicine, 39 (2005) 29-33.
  17. S.M. Machado, R.A. Osorio, N.S. Silva, M. Magini, Biomechanical analysis of the muscular power of martial arts athletes, Medical & Biological Engineering & Computing, 48 (2010) 573-7.
  18. H.B. Kim, C.L. Stebbins, J.H. Chai, J.K. Song, Taekwondo training and fitness in female adolescents, Journal of Sports Sciences, 29 (2011) 133-8.
  19. S.S. Fong, S.N. Fu, G.Y. Ng, Taekwondo training speeds up the development of balance and sensory functions in young adolescents, Journal of Science and Medicine in Sport, 15 (2012) 64-68.
  20. M.A. Suzana, Pieter Willy, The effect of training on general motor abilities in young Malaysian taekwondo athletes, Acta Kines Univ Tartuensis, 11 (2006) 87-96.
  21. B.I. Deforche, A.P. Hills, C.J. Worringham, P.S. Davies, A.J. Murphy, J.J. Bouckaert, I.M. De Bourdeaudhuij, Balance and postural skills in normal-weight and overweight prepubertal boys, International Journal of Pediatric Obesity, 4 (2009) 175-82.
  22. B. McGraw, B.A. McClenaghan, H.G. Williams, J. Dickerson, D.S. Ward, Gait and postural stability in obese and nonobese prepubertal boys, Archives of Physical Medicine and Rehabilitation, 81 (2000) 484-489.
  23. N. Pathare, E.M. Haskvitz, M. Selleck, Comparison of measures of physical performance among young children who are healthy weight, overweight, or obese, Pediatric Physical Therapy, 25 (2013) 291-296.
  24. D.L. Riddiford-Harland, J.R. Steele, L.A. Baur, Upper and lower limb functionality: are these compromised in obese children?, International Journal of Pediatric Obesity, 1 (2006) 42-49.
  25. Centers for Disease Control and Prevention. BMI percentile calculator for child and teen, English conversion.http://www.cdc.gov. Accessed November 18, 2013.
  26. J.S. Leard, M.A. Cirillo, E. Katsnelson, D.A. Kimiatek, T.W. Miller, K. Trebincevic, J.C. Garbalosa, Validity of two alternative systems for measuring vertical jump height, Journal of Strength and Conditioning Research, 21 (2007) 1296-1299.
  27. J.L. Nuzzo, J.H. Anning, J.M. Scharfenberg, The reliability of three devices used for measuring vertical jump height, Journal of Strength and Conditioning Research, 25 (2011) 2580-2590.
  28. Jennie Gilbert Hartman & Marilyn Looney, Norm-referenced and criterion-referenced reliability and validity of the back-saver sit-andreach, Measurement in Physical Education and Exercise Science, 7 (2003) 71-87.
  29. P. Patterson, D.L. Wiksten, L. Ray, C. Flanders, D. Sanphy, The validity and reliability of the back saver sit-and-reach test in middle school girls and boys, Research Quarterly for Exercise and Sport, 67 (1996) 448-451.
  30. M.W. Beets, M.M. Patton, S. Edwards, The accuracy of pedometer steps and time during walking in children, Medicine and Science in Sports and Exercise, 37 (2005) 513-520.
  31. Shirley Siu Ming Fong, William Wai Nam Tsang and Gabriel Yin Fat Ng, Lower limb joint sense, muscle strength and postural stability in adolescent Taekwondo practitioners, International Sportmed Journal, 14 (2013) 44- 52.
  32. Eva D’Hondt, Benedicte Deforche, Ilse De Bourdeaudhuij and Matthieu Lenoir, Relationship between motor skill and body mass index in 5- to 10-year-old children, Adapted Physical Activity Quarterly, 26 (2009) 21-37.
  33. H.T. Leong, S.N. Fu, G.Y. Ng, W.W. Tsang, Low-level Taekwondo practitioners have better somatosensory organisation in standing balance than sedentary people, European Journal of Applied Physiology, 111 (2011) 1787-1793.
  34. G. Pons van Dijk, A.F. Lenssen, P. Leffers, H. Kingma, J. Lodder, Taekwondo training improves balance in volunteers over 40, Frontiers in Aging Neuroscience, 5 (2013) 10.
  35. J. Castro-Pinero, J.L. Gonzalez-Montesinos, J. Mora, X.D. Keating, M.J. Girela-Rejon, M. Sjostrom, J.R. Ruiz, Percentile values for muscular strength field tests in children aged 6 to 17 years: influence of weight status, Journal of Strength and Conditioning Research, 23 (2009) 2295-2310.
  36. R. Rauch, L.N. Veilleux, F. Rauch, D. Bock, E. Welisch, G. Filler, T. Robinson, E. Burrill, K. Norozi, Muscle force and power in obese and overweight children, Journal of Musculoskeletal & Neuronal Interactions, 12 (2012) 80-83.
  37. G. Markovic, M. Misigoj-Durakovic, S. Trninic, Fitness profile of elite Croatian female taekwondo athletes, Collegium Antropologicum, 29 (2005) 93-99.
  38. S. Chiodo, A. Tessitore, C. Cortis, C. Lupo, A. Ammendolia, T. Iona, L. Capranica, Effects of official Taekwondo competitions on all-out performances of elite athletes, Journal of Strength and Conditioning Research, 25 (2011) 334-339.
  39. M.R. Minck, L.M. Ruiter, W. Van Mechelen, H.C. Kemper, J.W. Twisk, Physical fitness, body fatness, and physical activity: The Amsterdam Growth and Health Study, American Journal of Human Biology, 12 (2000) 593-599.
  40. R.R. Pate, C.A. Slentz, D.P. Katz, Relationships between skinfold thickness and performance of health related fitness test items, Research Quarterly for Exercise and Sport, 60 (1989) 183- 189.
  41. J. Heller, T. Peric, R. Dlouha, E. Kohlikova, J. Melichna, H. Novakova, Physiological profiles of male and female taekwon-do (ITF) black belts, Journal of Sports Sciences, 16 (1998) 243-249.
  42. H.R. Noorul1, Willy Pieter and Z.Z. Erie, Physical fitness of recreational adolescent taekwondo athletes, Brazilian Journal of Biomotricity 2 (2008) 230-240.
  43. N.N. Toskovic, D. Blessing, H.N. Williford, Physiologic profile of recreational male and female novice and experienced Tae Kwon Do practitioners, The Journal of Sports Medicine and Physical Fitness, 44 (2004) 164-172.