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Effects of Elbow Ulnar Collateral Ligament Injury on Differences in Maximal Isometric Strength of Upper body in Young Baseball Pitchers

주니어 투수들의 팔꿈치 안쪽 곁인대 손상이 상지 근육의 최대등척성수축력 차이에 미치는 영향

  • Jang, Sehong (Department of Physical Education, Chonnam National Univerisy) ;
  • Kim, Donghee (Department of Physical Education, Chonnam National Univerisy)
  • Received : 2016.08.04
  • Accepted : 2016.10.07
  • Published : 2016.10.31

Abstract

Many pitchers suffer from various types of injury (distortion, sprain and so on). The rate of injury is increased if there are differences in strength between the extensor and flexor muscles when a joint movement is performed with maximum speed. However, there has been insufficient research into the injury caused by strength differences between the extensor and flexor muscles. Thus, the purpose of the study was to examine the effects of elbow ulnar collateral ligament injury on the maximal isometric strength in young baseball pitchers. The data collection was conducted for 2 weeks. The subjects (n=36) who participated in this study were placed into either the injury group (n = 18, IG) or normal group (n = 18, NG). The maximal isometric strength for the pectoralis major (PM), infraspintus (I), biceps brachii (BB), triceps brachii (TB), flexor carpi radialis (ECR) and extensor carpi radialis (FCR) muscles were determined by an isometric strength machine (K-DFX) and then the differences in strength were calculated by muscle group. All of the data were analyzed by SPSS 18.0 with the independent t-test. In the results, the maximal isometric strengths in the IG for the I (p=0.035), BB (p=0.031) and TB (p=0.041) were significantly lower than those in the NG, while that for the ECR (p=0.047) was significantly greater. In addition, the differences of the maximal isometric strength between the PM and I (p = 0.008), BB and TB (p = 0.002), and FCR and ECR (p = 0.032) in the IG were significantly greater than those in the NG. In conclusion, the differences in muscle strengths of the subjects in the IG were greater than those in the NG, which suggests that they might have a higher injury rate in the future. However, they might be able to recover from their injury and achieve better performance if the differences in strength were reduced by training.

투수들의 경기력은 야구경기에서 아주 중요한 역할을 하는데 많은 투수들은 염좌 인대손상 등 많은 상해에 시달린다. 이러한 이유는 한 관절을 움직일 때 사용되는 주요한 두 가지 근육의 근력 차이가 클수록 부상의 위험성이 높아지기 때문이다. 하지만 이와 관련된 연구는 미비한 실정이다. 따라서 본 연구는 야구선수들을 대상으로 팔꿈치 안쪽 곁인대 통증이 있는 선수들과 통증이 없는 선수들의 투구 동작에 관련된 최대 등척성 수축력의 차이를 알아보고자 하였다. 실험기간은 2주간으로 모든 실험참가자들의 측정이 실시되었다. 실험참가자들(n=36)은 통증이 있는 통증군 (n=18)과 통증이 없는 정상군 (n=18)으로 나뉘어 최대 등척성 수축력을 어깨관절 안쪽과 바깥돌림근, 팔꿉굽힘근과 폄근, 손목굽힘근과 폄근에서 측정하였고 그후 근육그룹간 근력의 차이를 계산하였다. 모든 데이터는 SPSS 18.0을 이용하여서 독립 t-test를 이용하여서 분석되었다. 연구결과는 통증군의 바깥돌림근 (p = 0.035), 팔꿉굽힘근 (p=0.031), 팔꿉폄근 (p=0.041)은 정상군보다 유의하게 낮았고 손목폄근(p=0.047)은 정상군보다 유의하게 높았다. 그리고 통증군의 어깨관절 안쪽과 바깥돌림근(p = 0.008), 팔꿉관절 굽힘근과 폄근(p = 0.002), 손목관절의 굽힘근과 폄근의 (p = 0.032) 최대등척성수축력의 차이가 정상군보다 유의하게 높게 나타났다. 연구결과 통증군의 최대등척성수축력의 차이가 높게 나타나서 부상이 발생한다고 보고하였다. 그러므로 이러한 근력의 불균형 문제를 해결한다면 부상에서 회복하고 더불어 경기력 향상을 이룰 수 있게 된다고 사료된다.

Keywords

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