ASSOCIATION BETWEEN CORE MUSCLES ACTIVATION AND THE 400-METER OVERGROUND SPRINTING VELOCITY IN WHEELCHAIR RACERS
Objective: To measure the activity of the core muscles and the middle trapezius in T54 class wheelchair racers during full-effort over ground sprinting and to determine its association with propulsion velocity. Material and Method: Eightmale international wheelchair racershaving normal upper limband partial to normaltrunk function(T54 class athletes) propelled their racing wheelchairs on 400-m competition trackwith maximal effort. Electromyography(EMG)of the rectus abdominis (RA), iliocostalis lumborum (IL), longissimus thoracis (LT) and middle trapezius (MT) were recorded at each 100-m reach using a wireless surface EMG recorder. Percentage of maximal voluntary contraction (%MVC)was measuredand correlated with propulsion velocity. Results:Median %MVC of RA, IL, LT and MT were 54.2, 43.9, 30.6 and 35.6% respectively. Positive associationto propulsion velocity was found in RA (p = 0.04, r = 0.73). Negative association to propulsion velocity was also found in MT (p = 0.03, r = -0.77). Conclusion: Abdominal function wasactivated most andassociated with propulsion velocity in male T54 class wheelchair racers. In addition, optimizing scapularretraction may benefit propulsionvelocity.
Moss AD, Fowler NE, Goosey-Tolfrey VL. The intra-push velocity profile of the over-ground racing wheelchair sprint start. J Biomech2005;38:15-22.
Vanlandewijck Y, Theisen D, Daly D. Wheelchair propulsion biomechanics: implications for wheelchair sports. Sports med 2001;31:339-67.
Kumerddee W, Tongsiri N. Corelation between anaerobic fitness and starting velocity in Thai national team wheelchair racers. J Thai Rehabil Med 2010:20:68-72.
Chow JW, Levy CE. Wheelchair propulsion biomechanics and wheelers' quality of life: an exploratory review. Disabil Rehabil Assist Technol 2011;6:365-77.
van der Woude LH, Bakker WH, Elkhuizen JW, Veeger HEJ, Gwinn T. Propulsion technique and anaerobic work capacity in elite wheelchair athletes: cross-sectional analysis. Am J Phys Med Rehabil1998;77: 222-34.
Wang YT, Deutsch H, Morse M, Hedrick B, Millikan T. Three-dimensional kinematics of wheelchair propulsion across racing speeds. Adapt Phys Act Q 1995;12:78-89.
Limrungreungrat W. and Wang YT. Three-dimensional pushrim force during different racing wheelchair propulsion speeds. In: Routledge handbook of ergonomics in sport and exercise. 1 edn. New York: Roudledge, 2014. pp. 549-56.
Chow JW, Millikan TA, Carlton LG, Morse MI, Chae WS. Biomechanical comparison of two racing wheelchair propulsion techniques. Med Sci Sports Exerc 2001;33:476-84.
Guo LY, Su FC, An KN. Effect of handrim diameter on manual wheelchair propulsion: mechanical energy and power flow analysis. Clin biomech 2006;21:107-15.
Willardson JM. Core stability training: applications to sports conditioning programs. J Strength Cond Res 2007;21:979-85.
Mautner KR, Huggins MJ. The young adult spine in sports. Clin Sports Med 2012;31:453-72.
Shinkle J, Nesser TW, Demchak TJ, McMannus DM. Effect of core strength on the measure of power in the extremities. J Strength Cond Res 2012;26:373-80.
Hill J, Leiszler M. Review and role of plyometrics and core rehabilitation in competitive sport. Curr sports med rep 2011;10:345-51.
Bliss LS, Teeple P. Core stability: the centerpiece of any training program. Curr sports med rep 2005;4:179-83.
Kibler WB, Press J, Sciascia A. The role of core stability in athletic function. Sports med 2006;36:189-98.
Hibbs AE, Thompson KG, French D, Wrigley A, Spears I. Optimizing performance by improving core stability and core strength. Sports med 2008;38:995-1008.
Sato K, Mokha M. Does core strength training influence running kinetics, lower-extremity stability, and 5000-M performance in runners? J Strength Cond Res 2009;23:133-40.
Saeterbakken AH, van den Tillaar R, Seiler S. Effect of core stability training on throwing velocity in female handball players. J Strength Cond Res 2011;25:712-18.
Borghuis AJ, Lemmink KA, Hof AL. Core muscle response times and postural reactions in soccer players and nonplayers. Med Sci Sports Exerc 2011;43:108-14.
Guo LY, Su FC, Wu HW, An KN. Mechanical energy and power flow of the upper extremity in manual wheelchair propulsion. Clin biomech 2003;18:106-14.
Kibler B. Biomechanical analysis of the shoulder during tennis activities. In: Clinics in sports medicine, racquet sports. Richard C. Lehman, eds. Philadelphia: W.B. Saunders company, 1995. pp. 79-85.
Kaczmarek P, Lubiatowski P, Cisowski P, Grygorowicz M, ?epski M, D?ugosz J, Ogrodowicz P, Dudzi?ski W, Nowak M, Romanowski L. Shoulder problems in overhead sports. Part I - biomechanics of throwing. Pol Orthop Traumatol. 2014;15:50-58.
Paine R, Voight ML. The role of the scapula. Int J Sports Phys Ther. 2013;8:617-29.
Mulroy SJ, Gronley JK, Newsam CJ, Perry J. Electromyographic activity of shoulder muscles during wheelchair propulsion by paraplegic persons. Arch Phys Med Rehabil 1996;77:187-93.
International Paralympic Committee. IPC Athletics Classification. Handbook of IPC athletics classification workshop, 2006. pp. 10-11.
Konrad P. Signal processing-amplitude normalization, The ABC of EMG-A practical introduction to kinesiological electromyography. Scottsdale: Noraxon U.S.A., 2006. pp. 15.
Criswell E. Electrode placements. In: Cram's introduction to surface electromyography. 2 edn. Sudbury, Massachusetts: Jones and Barlett Publishers, 2011. pp. 257-384.
Rankin JW, Richter WM, Neptune RR. Individual muscle contributions to push and recovery subtasks during wheelchair propulsion. J Biomech 2011;44:1246-52.
Tweedy S. Research report, IPC athletics classification project for physical impairments: final report – stage 1. University of Queensland, 2009. pp. 37.
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