مقایسه تغییرات مرکز فشار حین راه رفتن به جلو و عقب در مردان کاراته کای نخبه با زانوی پرانتزی و نرمال

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران

2 استاد تمام گروه بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران

3 استادیار گروه بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران

چکیده

مقدمه و اهداف
با توجه به اینکه اختلال در وضعیت بدن، ثبات دینامیک را در حین انجام حرکات و مهارتهای ورزشی تحت تاثیر قرار میدهد، هدف از انجام این تحقیق مقایسه تغییرات مرکز فشار نسبت به مرکز جرم حین راه رفتن به جلو و عقب در مردان کاراتهکای نخبه با زانوی پرانتزی و نرمال بود.
مواد و روش ها
در این مطالعه نیمه­تجربی20 مرد کاراته­کای نخبه در دو گروه زانوی پرانتزی و نرمال به عنوان آزمودنی شرکت کردند. با استفاده از اطلاعات حاصل از صفحه نیرو، تغییرات مرکز فشار نسبت به مرکز جرم بدن حین راه رفتن به جلو و عقب محاسبه شد.
یافته ها
نتایج نشان داد، تغییرات مرکز فشار نسبت به مرکز جرم بدن بین راه رفتن به جلو و عقب در جهت داخلی- خارجی در اندام غیرغالب معنادار بوده (005/0P=). درحالی که در جهت قدامی- خلفی در هیچکدام از اندامهای غالب و غیرغالب معنادار نبود. ضمن اینکه بین دو گروه زانوی پرانتزی و نرمال در تغییرات مرکز فشار نسبت به جرم بدن در جهت قدامی- خلفی حین راه رفتن به جلو در هر دو اندام تفاوت معنادار (01/0P=). اما در جهت داخلی- خارجی اختلاف معناداری مشاهده نشد. بین اندامهای غالب و غیرغالب در تغییرات مرکز فشار نسبت به مرکز جرم در هیچکدام از جهات تفاوت معناداری مشاهده نشد.
نتیجه گیری
با توجه به نتایج تحقیق حاضر، الگوی تغییرات مرکز فشار نسبت به مرکز جرم در راه رفتن به سمت جلو نسبت به راه رفتن به سمت عقب تفاوت دارد، در شرایطی که پایداری راه رفتن در هر دو جهت در افراد زانوی پرانتزی کمتر از افراد کاراتهکای نرمال است.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison between changes in the center of pressure among the elite male karatekas with or without genu varum during forward and backward walking tasks

نویسندگان [English]

  • Siavash Shirvani Pour 1
  • Heidar Sadeghi 2
  • Raghd Mimar 3
1 MSc Student in Sport Biomechanics, Kharazmi University, Teheran, Iran
2 Full professor, Faculty of Physical Education and Sport Sciences, Kharazmi University, Teheran, Iran
3 Assistant Professor, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran
چکیده [English]

Background and Aim: Since impairment in body alignment affects dynamic stability during sport movements and skills, the purpose of the present study was to compare center of pressure changes to center of mass during forward and backward walking among elite male karatekas with Genu varum and normal angle.
Materials and Method: Twenty elite male karatekas (two groups of Genu varum and normal) participated in the current semi-experimental study. Center of pressure changes to center of mass was calculated using force plate data during forward and backward walking.
Results: The results showed that center of pressure changes to center of mass was significantly different in medial-lateral direction in non-dominant limb between forward and backward walking (p=0.005), while it was not foud to be significantly different in anterior-posterior direction. Also, the difference between Genu varum group and normal group was significant in the center of pressure changes to center of mass in anterior-posterior direction in both limbs during forward walking (p=0.010), but no significant difference was observed in medial-lateral direction. Moreover, no significant difference could be observed between dominant and non-dominant limbs in the center of pressure changes to center of mass in none of the directions.
Conclusion: According to the results of the present study, the pattern of the center of pressure changes to center of mass during forward walking was different from that of backward walking. However, in both directions, gait stability in Genu varum participants was observed to be less than that of the normal karatekas.

کلیدواژه‌ها [English]

  • Walking
  • Genu varum
  • Karate
  • Center of pressure
  1. Heidari Nik H. The study of body abnormalities in student's boy in Komijan city [Online]. 2007 [cited 2007 Dec 10]; Available from: URL: http://komijanpazhohesh.blogfa.com/post-4.aspx/.##
  2. Daneshmandi H, Alizadeh MH, Gharakhanlou R. Corrective Action: Detect and Prescribing Practices. Tehran, Iran: The Institute of Physical Education and Sports Science 2005; 31-95. [In Persian].##
  3. Dadgar H, Sahebazamani M, Noraei T, Sharifian E. The relationship between Q angle size and non-contact injuries of lower extremity in the men karateka. Medician sport 2011; 3: 83-97. [In Persian].##
  4. Stief F, Bohma H, Schwirtz A, Dussa CU, Doderlein L. Dynamic loading of the knee and hip joint and compensatory strategies in children and adolescents with varus mal-alignment. Gait & Posture 2011; 33: 490–5.##
  5. Sharma L, Lou C, Cahue S, Dunlop DD. The mechanism of the effect of obesity in knee osteoarthritis: the mediating role of malalignment. Arthrit Rheum 2000; 43: 568–75.##
  6. Chang A, et al. Hip abduction moment and protection against medial tibiofemora osteoarthritis progression. Arthritis & Rheumatism 2005; 52 (11): 3515–19.##
  7. Beneke R, Beyer T, Jachner Ch, Erasmus J, Hutler M. Energetic in karate. Applied physiology 2004; 92(4-5): 518-23.##
  8. Magee DA. Orthopedic physical assessment. 4th Edition. Edmonton, Alberta, Canada 2006: 679-81.##
  9. Grasso R, Binachi L, Lacquaniti F. Motor patterns for human gait: backward versus forward locomotion. Journal of Neurophysiology 1998; 80: 1868-85.##
  10. Yoon SH, Kim TS, Lee JH, et al. Evaluation of the elderly gait stability using the center of mass and center of pressure inclination angles. Korean Journal of Sport Biomechanics 2007; 17: 99–106. ##
  11. Lee HJ, Chou LS. Detection of gait instability using the center of mass and center of pressure inclination angles. Archives of Physical Medicine and Rehabilitation 2006; 87: 569–75.##
  12. Regolin F, Carvalho G. Relationship between thoracic kyphosis, bone mineral density, and postural control in elderly women. Revista Brasileira de Fisioterapia 2010; 14: 464–9.##
  13. Cote KP, Brunet ME, Gansneder BM, Shutz SJ. Effect of pronated and supinated foot postures on static and dynamic postural stability. Journal of Athletic Training 2005; 40(1): 41-6.##
  14. Phillip G, Tucker S, White P. Time of day influences on static and dynamic postural Control. Journal of Athletic Training 2007; 42(1): 35-41.##
  15. Alizadeh MH, Gheytasi M. Fandamental Concept of Corrective Exercise. Tehran. Institute of Physical Education and Sports Science 2012. [In Persian]. ##
  16. Plastanga N. Anatomy & human movement structure & function. 5 ed. Butterworth-Heinemann 2006.##
  17. Kaviani-najafabadi R, Afzalpour ME, Ehsanbakhsh A. The comparison of bony condition and muscular strength among the elite men karateka with kata and kumite methods of south Khorasan state. Sport Physiology 2013; 5(18): 67-80. [In Persian].##
  18. Dionisio VC, Almeida GL, Duarte M, Hirata RP. Kinematic, kinetic and EMG patterns during downward squatting. Electromyography Kinesiology 2008; 18(1): 134-43.##
  19. Lafonda D, Duarteb M, Prince F. Comparison of three methods to estimate the center of mass during balance assessment. Journal of Biomechanics 2004; 37: 1421–6.##
  20. Dufek JS. Exercise variability: A prescription for overuse injury prevention. Health and Fitness Journal 2002; 6(4): 18-23.##
  21. Panah-abadi M, Aghayari A, Salari Esker F, Anbarian M. The effect of genu varum deformity on balance control following postural perturbation in adolescent girls. Scientific Journal of Kurdistan University of Medical Sciences 2013; 18(2): 67-76. [In Persian]. ##
  22. Nyland J, Smith S, et al. Frontal plane knee angle affects dynamic postural control strategy during unilateral stance. Medicine & Science in Sports & Exercise 2002; 34(7): 1150-7.##
  23. Nakhaee Z, Rahimi A, Abaee M, Rezasoltani A, Kalantari KK. The relationship between the height of the medial longitudinal arch (MLA) and the ankle and knee injuries in professional runners. Foot (Edinb) 2008; 18(2): 84-90. [In Persian].##
  24. Shahamiri FF, Alizadeh MH, Minonezhad H. The effect of genu varum deformity on dynamic stability in single jump-land.Studies of Sport Medicine 2012; 13: 39-52. [In Persian].##
  25. Samaei A, Bakhtiary A, Elham F, Rezasoltani A. Effects of genu varum deformity on postural stability. International Journal of Sports Medicine 2012; 33(6): 469-73. [In Persian].##

16.    Stefano V, et al. Postural Adaptations in Preadolescent Karate Athletes Due to a One Week Karate Training Camp. Journal of Human Kinetics 2013; 38: 45–52.##