• 대한정형도수물리치료학회지
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• 제22권1호
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• pp.71-76
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• 2016

Background: The objective of this research is to provide base line data on Korea Baseball rehabilitation treatment by presenting the distribution of upper extremity surgeries according the surgical sites of Korean professional baseball players. Methods: The targets of this research are 561 players from nine Korean baseball clubs. The number of players that have undergone surgery was investigated. In other words, the frequency of shoulder joint surgeries, elbow joint surgeries, and wrist and hand surgeries per each baseball club was investigated. Results: The number of the players who have had surgeries was 151, but among the players, there were some who have had repeated surgeries for which the total number of surgery experience was 162. The result showed that elbow joint surgeries were the most frequently enacted, followed by shoulder joint surgeries, and wrist and hand surgeries. From the nine clubs, Samsung was the club with the highest frequency of surgeries. Conclusions: This research shows that Korean professional baseball players need special training centers with systematic rehabilitation programs. Another conclusion suggests that urgent need for rehabilitation program of upper arm which particularly focused on elbow joint is existing. On the basis of this research, we expect more studies on the specific rehabilitation programs which is categorized by injury areas.

• 국제물리치료학회지
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• 제3권2호
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• pp.464-468
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• 2012

The objective of this study is to provide basic information on coupled motions in thoracic spine during lateral bending from a neutral position for football and baseball players as well as for general university students. In the experiment, a total of 30 subjects participated(football players: 10, baseball players: 10, general students: 10). All subjects were in their 20's. The subjects sat on a chair with lumbar support in a neutral position and bent to the right. As a result, for baseball players, coupled motions were observed in the opposite direction of the lateral bending in all parts of thoracic spine. For both football players and general students, coupled motions were observed in the same direction. These results confirmed that unilateral movements like baseball could affect coupled motions.

• 대한정형외과스포츠의학회지
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• 제6권1호
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• pp.50-56
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• 2007

목적: 소년부터 성인까지의 야구 선수들의 주관절 손상의 빈도와 발생 양상 및 추이를 알아보고자 하였다. 대상 및 방법: 2004년 1월부터 12월까지 초등학교, 중학교, 고등학교 그리고 프로 야구 선수 각각 80명, 총 320명을 대상으로 설문 조사 및 양측 주관절의 전 후면과 측면 단순 방사선 촬영을 시행하였다. 결과: 모든 선수 군에서 주관절의 통증 부위와 골 변화가 내측에서 가장 많았으며 특히 내측 상과 골단 비후(Hypertrophy of medial epicondyle)가 많았다. 선수의 연령이 증가할수록 주관절의 방사선학적 변화가 증가하였으며 초등학교 선수 65%, 중학교 선수 82%, 고등학교 선수 85%, 프로 선수 88%에서 주관절의 골 변화가 나타났다. 결론: 야구 선수들의 주관절 골 변화는 연령이 증가할수록 많았으며 과거에 비해 증가하였다.

• 한국운동역학회지
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• 제26권2호
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• pp.205-211
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• 2016

Purpose: The aim of this study was to analyze biomechanical factors and PMT (premotor time) of body muscles between elite college and amateur baseball players during the baseball batting motion. Method: Kinematic and electromyographic data were obtained for 10 elite college baseball players and 10 amateur baseball players who participated in this study. All motion capture data were collected at 200 Hz using 8 VICON cameras and the PMT of muscles was recorded using a Delsys Trigno wireless system. The peak mean bat speed and the peak mean angular velocities of trunk, pelvis, and bat with PMT of 16 body muscles were computed. These kinematic and PMT data of both groups were compared by independent t-tests (p < .05). Results: The pelvis, trunk, and bat showed a sequence of angular velocity value during baseball batting. The PMTs of right tibialis anterior, left gastrocnemius, external oblique, and erector spinae were significantly different between the two groups. Conclusion: The PMT of body muscles was related to the shifting of body and rotation of the pelvis and the trunk segment, and this action can be considered the coordinated muscle activity of the lower and upper body.

• The Journal of Korean Physical Therapy
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• 제33권5호
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• pp.217-223
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• 2021

Purpose: This study sought to identify the effects of coordinative locomotor training (CLT) using elastic bands on the flexibility and body alignment of right-handed baseball players in elementary school. Methods: The subjects were 20 instructed right-handed baseball players in elementary school. They were classified into the experimental group with 10 players (n=10) to be given coordinative locomotor training using elastic bands and the control group with 10 players (n=10). Flexibility was measured by the sit and reach exercise. Body alignment was measured using formetric 4D method to measure the trunk imbalance angle (TI), trunk torsion angle (TT), pelvic tilt angle (PTi), pelvic torsion angle (PTo), pelvic rotation angle (PR), kyphotic angle (Ky), and lordotic angle (Lo). Results: There was a significant increase in the flexibility within the experimental group (p<0.05). after the intervention. There was also a significant increase in the difference between the experimental group and the control group (p<0.05). There was a significant decrease in PR during body alignment in the experimental group after intervention (p<0.05). An analysis of the differences between groups showed a significant decrease in the PR of the experimental group compared to the control group (p<0.05). Conclusion: These findings show that coordinative locomotor training using elastic bands would be effective for enhancing the flexibility and pelvic rotation of elementary school right-handed baseball players.

• 한국의류산업학회지
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• 제17권5호
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• pp.800-814
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• 2015

This study develops baseball uniforms for amateur baseball players with excellent appearance and functional movement. This study selected a conventional baseball uniform and developed a new one for amateur baseball players with improved function and appearance based on previous research results. In case of developed baseball uniform materials, this study used polyurethane mixed fabric for the top to improve flexibility. A mesh material was used at the armpit, back, and bottom of the top, side line of pants and pockets to improve breathability. In addition, quilted material was added to the knee to improve durability and protection. For the patterns and design, this study used a gusset under the arm to assist in comfortable movement as well as reduced the length of the top and circumference of the hem to decrease unnecessary parts. For the pants, this study used a waistband gripper to avoid the top riding up, added darts behind the knees to bend comfortably, and added additional fabric inside the hem to prevent dirt. In addition, we reduced the width and length of the pants. Wearing evaluation was divided into appearance evaluation by experts and on-site-wearing test by baseball players. The wearing evaluation results for the developed baseball uniform indicated higher evaluations than a conventional baseball uniform in all sections as well as showed significant differences in all sections. The result of movement adaptability evaluation showed the highest satisfaction for 'the top does not ride up' and 'dirt do not get in'.

• 산업공학
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• 제17권4호
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• pp.440-449
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• 2004

The OERA(Offensive Earned-Run Average) is a methodology for the performance evaluation of baseball players, which is based on a well- known Markov chain model. The DEA(Data Envelopment Analysis) is an LP-based evaluation technique for performance analysis of DMUs (Decision Making Units), whose production activities are characterized by multiple inputs and outputs. In this paper, the performances of Korean professional baseball players are analytically evaluated using both OERA and DEA methods. We discuss methodological strengths and drawbacks of two kinds of baseball evaluation techniques, by comparing both results. Finally to overcome the shortcomings of both methods, we develop a new analytical approach for baseball evaluation by combining OERA with DEA.

• 대한정형외과스포츠의학회지
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• 제11권2호
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• pp.75-81
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• 2012

목적: 무증상 고교 야구 선수의 양측 견관절 초음파 소견을 알아보고 이를 건강한 대조군과 비교하고자 한다. 대상 및 방법: 총 42명(연령: 1$7.6{\pm}1.2$세)이 본 연구에 참여하였다. 최근 6개월간 견관절 통증이 없었던 남자 고교 야구 선수 중 투수 14명과 야수 18명을 두 그룹으로 분류하고 같은 연령대의 스포츠 활동을 하지 않는 고교 학생 10명을 대조군으로 설정하였다. 초음파를 이용하여 우세수와 비우세수의 상완 이두건 장두와 극상건의 두께를 측정하고 0도 외전 상태에서의 견봉 상완 간격을 측정하였다. 결과: 초음파 검사 상 야구 선수 32명 중 우세수에서 7명, 비우세수에서 2명에서 견봉하 점액낭의 삼출액이 관찰 되었으며 이는 무증상 대조군에서는 관찰되지 않았다. 양 견관절의 상완 이두건 장두와 극상건의 두께, 견봉 상완 간격은 대조군 보다 야구 선수에서 의미 있게 증가되어 있었다(p<0.05). 또한 야구 선수에서 상완 이두건과 극상건의 두께, 견봉 상완 간격은 비우세수에 비해 우세수에서 증가를 보였으나(p<0.05), 투수와 야수와의 차이는 없었으며 대조군 사이에서도 차이는 없었다. 결론: 무증상 고교 야구 선수에서도 초음파 상 견봉하 점액낭의 삼출액이 관찰될 수 있고 정상인보다 야구 선수에서 상완 이두건, 극상건의 두께가 더 두껍고 견봉 상완 간격이 증가되어 있으므로 이는 고교 야구 선수의 견관절 질환의 초음파 진단 시 유용한 참고 자료가 될 것으로 사료된다.

• 한국산학기술학회논문지
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• 제15권1호
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• pp.165-172
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• 2014

본 논문의 주된 관심은 좋은 기록을 보유하고 있는 선수들로 국가대표단을 구성하면 세계대회에서 좋은 성적을 올릴 수 있는가이다. 2010년 광조우 아시안게임에서 우승한 야구 국가대표단 선수들의 경기력을 한국프로야구선수들과 함께 평가해보고, 그 중에서 기량이 뛰어난 선수들로 대표단을 구성하였는지 분석해 보고자 한다. 본 연구를 위해 사용된 DEA모형은 DMU의 재량권이 제한된 BCC 모형(BCC model with non-discretionary)이다. 분석을 위한 투입변수는 타석수와 도루시행횟수이며, 산출변수는 공격공헌도, 도루성공률 및 득점이다. 분석대상이 된 97명의 선수 중에서 22명의 선수가 효율적인 것으로, 75명의 선수가 비효율적인 것으로 측정되었다. 그리고 12명의 대표선수 중에서 8명의 선수가 효율적인 것으로 분류되었다. 이는 2010년 광조우 아시안게임에서의 야구대표팀이 이전 세계대회에서의 경험을 교훈으로 삼아 최강의 전력을 발휘할 수 있는 선수들로 구성되었음을 보여주고 있다.

• 대한물리의학회지
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• 제16권3호
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• pp.115-121
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• 2021

PURPOSE: This study analyzed the correlation between the plantar pressure and body alignment according to the dominant hand of elementary school baseball players. METHODS: The subjects consisted of 32 elementary school baseball players. The 32 players were classified in the right-hand dominant group (Rt. Group, n = 22) and left-hand dominant group (Lt. group, n = 10). The plantar pressure was measured using a pedoscan to determine the maximum pressure and pressure distribution. The body alignment was measured using a fometric 4D to measure the trunk imbalance angle (TI), pelvic tilt angle (PTi), pelvic torsion angle (PTo), pelvis rotation angle (PR), kyphotic angle (Ky), lordotic angle (Lo), and trunk torsion angle (TT). RESULTS: Participants showed correlations in the Rt. group, according to the left maximum pressure, Lo (r = .592, p < .05), and TT (r = .514, p < .05); according to the right maximum pressure, PR (r = .539, p < .05), and Lo (r = .503, p < .05). In the left pressure distribution, the PR (r = -.521, p < .05) showed a negative correlation. In the Lt. group, the PT (r = -.591, p < .05) showed a negative correlation in the left pressure distribution. CONCLUSION: These results can be used as basic data for a body analysis study of elementary school baseball players in the future.