ASSOCIATION BETWEEN CORE MUSCLES ACTIVATION AND THE 400-METER OVERGROUND SPRINTING VELOCITY IN WHEELCHAIR RACERS

Wipoo Kumnerddee; Tanormsak Senakham; Aungkana Theplertboon; Weerawat Limroongreungrat

doi:10.55374/jseamed.v2i2.12

Wipoo Kumnerddee Department of Rehabilitation Medicine, Phramongkutklao Hospital and College of Medicine
Tanormsak Senakham Department of Sports Science, Srinakharinwirot University
Aungkana Theplertboon Department of Rehabilitation Medicine, Charoenkrung Pracharuk Hospital
Weerawat Limroongreungrat College of Sports Science and Technology, Mahidol University

DOI: https://doi.org/10.55374/jseamed.v2i2.12

Keywords: Athlete athletics, Disabilities, Paraplegia, Sports, Propulsion

Abstract

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.

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