• Title/Summary/Keyword: University Athletes

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Design and Implementation of the Pitching Machine with Mobility using the Android Smartphone (안드로이드 스마트폰 기반 이동형 피칭 머신의 설계 및 구현)

  • Park, Sung-Yong;Oh, Kyung-Hyun;Choi, Ho-Lim
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.7
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    • pp.987-993
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    • 2014
  • Pitching machines have been around for many years for casual amusement purpose or professional athletes' training usage, and so forth. The current pitching machines are usually built on the firm ground and do not have any mobility function. In this paper, we develop a pitching machine that has both ball-shooting and mobility functions. Our developed pitching machine consists of two parts. The upper body part has a function of shooting a ball using two DC motors and the lower body part has a function of mobility like mobile robots by using two wheels governed by DC motors. All these functions are operated wirelessly by Android smartphones via bluetooth. The control of each DC motor is done by ${\epsilon}$-PID control method in which the gain tuning is simplied by using a single parameter ${\epsilon}$. Simulation and actual experiment show that our developed pitching machine has both nontrivial shooting and mobility features.

Stress Fracture of Olecranon in Growing Athletes: A Report of Two Cases (성장기 운동선수에서 발생한 척골주두의 스트레스 골절: 증례 보고 2례)

  • Baek, Seung-Hoon;Choi, Chang-Hyuk;Kim, Se-Sik;Choi, Yong-Suk
    • Journal of Korean Orthopaedic Sports Medicine
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    • v.9 no.1
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    • pp.65-68
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    • 2010
  • Operative treatment including a bone graft and an internal fixation was done in a fifteen-year old wrestler with transverse olecranon stress fracture. At 6 weeks after the operation, he could start active muscle strengthening exercise and returned to the previous level of exercise at 6 monthes after surgery. Conservative treatment including resting and muscle strengthening exercise was performed in an eighteen-year old baseball player with oblique olecranon stress fracture. At the follow-up of three months, he could start staged throwing exercise without pain or tenderness. He returned the previous level of throwing following strengthening exercise for 6 months.

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Study on the Wearing Conditions of Weight Training Compression Wear for Men in their 20s (웨이트 트레이닝 활동을 위한 20대 남성 컴프레션웨어 착의 실태)

  • Kim, Mira;Kim, Dong-Eun;Choi, Hei Sun
    • Journal of the Korean Society of Clothing and Textiles
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    • v.40 no.5
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    • pp.775-787
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    • 2016
  • This study examined the wearing conditions of compression wear for weight training. Compression wear has recently received significant attention from the public and athletes as high-level functional sportswear. The survey was conducted on 373 men in their 20s for general information on purchase behavior, preferred brand, function, and preferred design. The majority of participants (n=181) were aware of the function of compression wear. The most selected reason for wearing compression wear was for its convenience during sports activities. Respondents had the greatest preference for designs with a round neckline, regular leggings type, upper arm-length sleeve, and thigh-length bottom. Respondents also wanted a stronger compression in the core muscle part (abdomen, back, and waist).

Effect of Multi-functional Fabric on EEG and Growth Hormone Level during Sleep (특수기능성섬유가 성장기 운동선수의 수면 중 성장호르몬 분비에 미치는 영향)

  • Lee, Myeong-Soo;Lee, Jin-Hee;Koh, Kyung-Chan;Moon, Sun-Rock
    • Fashion & Textile Research Journal
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    • v.5 no.1
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    • pp.77-81
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    • 2003
  • The purpose of this study was to investigate the effect of multi-functional fabric on EEG and growth hormone (GH) during sleep and quality of sleep with the 9 young female athletes. The subjects participated in separated experimental procedure; sleeping in multi-functional fabric wear (experimental group) and cotton wear (control group) for 450min. During the night (22:00-05:30), we recorded the changes of nocturnal polysomnographic sleep recording and GH were measured every 60min. The results show that there are significant differences in percentage of stage 1, 2 and slow wave sleep (SWS) between two groups(S1, p<.05; S2, SWS, p<.01). The SWS percentage of experimental group is 1.89 times higher than control group. The changes of GH secretion varied depending on two experimental procedures. The peak of GH secretion in experimental group is more than controls by 2.4time (p<.001). The quality of sleep in experimetal group is significantly higher than control (p<.01). These results suggest muti-functional fabric wear is effective in inducing the deep sleep and increasing GH and quality of sleep.

The Effect of Supplementary Selenium on Leukocytes and HSP70 Expression after Half-Body Immersion (반신욕 중 셀레늄 섭취가 백혈구와 HSP70 발현에 미치는 영향)

  • Shin, Young-Oh;Han, Min-Kyu;Lee, Jeong-Beom;Um, Byung-Hun
    • Journal of Nutrition and Health
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    • v.44 no.5
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    • pp.378-383
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    • 2011
  • This study examined the effect of supplementary selenium on leukocytes and heat shock protein (HSP) 70 expression in serum during half-body immersion. The subjects were male college tennis athletes. All subjects participated in two repeated experiments with a 1 week interval. During the 30 min intermittent half-body immersion, subjects were given 500 mL of water with or without selenium (100 ${\mu}g$). Blood samples were taken from the antecubital vein, and differential counts were made. Serum HSP70 protein was analyzed using a commercial ELISA kit. After half-body immersion, leukocytes and lymphocytes increased significantly but neutrophils decreased significantly in both trials (with or without selenium). Selenium supplementation, compared with placebo, decreased levels of leukocytes, neutrophils, and monocytes, but not lymphocytes, to the resting level or below 60 min after immersion. Only lymphocytes continued to increase in both trials during the recovery period. Serum HSP70 protein level did not change after immersion, but it decreased 60 min after immersion with the administration of selenium. In conclusion, supplementary selenium reduced the systemic immune response and serum HSP70 protein accumulation after half-body immersion.

Comparative Study on Muscle Activity and Torque Value of Quadriceps of Healthy Adults

  • Kim, Min-Kyu;Ji, Hong-Ju;Kong, Yong-Soo;Hwang, Yoon-Tae;Park, Ji-Won
    • The Journal of Korean Physical Therapy
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    • v.28 no.3
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    • pp.212-216
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    • 2016
  • Purpose: The current study seeks to identify the relationship between torque values of the quadriceps and muscle activity during isometric and isokinetic exercises. Methods: The subjects of the study included 29 healthy individuals 17 men and 12 women) who took part in isometric and isokinetic exercises that utilized the quadriceps. The isometric exercises were performed three times each at 4 different angles (0, 30, 60, and 90 degrees). For the isokinetic exercises, concentric contraction and eccentric contraction were undertaken three times each at two angular velocities (30 and 60 degrees). Results: The muscle activity of the quadriceps during the isometric exercises showed significant differences at the 30, 60, and 90 degree angles. During the concentric contractions and eccentric contractions, muscle activity at the peak torque of the quadriceps indicated significant differences in vastus medialis, vastus lateralis, and rectus femoris at angular velocities of 30 and 60 degrees. Conclusion: When applied clinically based on the biomechanical analysis of the current study, it is possible to anticipate and selectively strengthen muscles with isometric and isokinetic exercises for not only healthy adults and professional athletes, but also for those who experience limited knee movement for long periods following knee surgeries.

Influence of Slashpipe Exercise on Symmetrical Contraction of Trunk Muscle in Normal Adults

  • Choi, Young In;Kim, Jung Sun;Kim, Shin Young
    • The Journal of Korean Physical Therapy
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    • v.31 no.5
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    • pp.298-303
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    • 2019
  • Purpose: This study examined the effects of slashpipe exercise on reducing the thickness of the left and right external oblique, internal oblique, transverse abdominis, erector spinae, and multifidus muscles. Methods: A total of 29 healthy adult men and women were included in the study. They performed trunk flexion in the supine position and trunk extension in the prone position with a slashpipe and weight bar. The external oblique, internal oblique, and transverse abdominis muscles were measured in the supine position, while the erector spinae and multifidus muscles were measured in the prone position. The data were analyzed using the SPSS ver 21.0 statistical program. The difference in thickness between the right and left sides of the trunk muscle was analyzed by repeated measures analysis. The statistical significance level was set to p<0.05. Results: The results showed that the slashpipe exercise reduced significantly the difference in thickness of the oblique internus and erector spinae muscles compared to the weight bar exercise. Conclusion: The chaotic fluidity of the fluid filled inside the slashpipe could be used as sensory feedback information on body mal-alignment, which would have positively affected the symmetrical contraction of the trunk muscles as a trigger for self-correction. Therefore, it will have a useful effect not only on the health of the general public, but also on low back patients and athletes with muscle asymmetry.

What Happens without Treating Chronic Lateral Ankle Instability (외측 발목 불안정성을 치료하지 않으면 어떻게 되는가)

  • Woo, Seung Hun;Chung, Hyung-Jin
    • Journal of Korean Foot and Ankle Society
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    • v.25 no.1
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    • pp.6-9
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    • 2021
  • The term chronic lateral ankle instability (CLAI) embraces a spectrum of conditions that involve functional and mechanical instability, both in athletes and lower-demand patients. The hallmarks of CLAI are recurrent sprains, persistent pain, and repeated episodes of the ankle giving way. CLAI is the main complication of acute ankle sprains, which can cause discomfort in daily and sports activity. Approximately 10% to 30% of patients with acute ligament ruptures will develop chronic instability over the course of a year from the index injury. An accurate diagnostic approach and successful treatment plan should be established based on a comprehensive understanding of the concept of functional and mechanical instability. Unfortunately, the optimal modality for the management of CLAI is unclear. Even after conservative treatment or surgical intervention, it could result in degenerative changes to the ankle joint in the long term. Thus far, the incidence of ligamentous posttraumatic ankle osteoarthritis was reported to be 13% to 78%. The mean latency time between injury and osteoarthritis was at least 10 to 34.3 years. CLAI is an important pathological condition that can cause discomfort or dysfunction in daily activity in the short term, resulting in joint destruction in the long term. Therefore, it is important to understand the various complications that can occur when CLAI is not treated properly.

Evaluation of Muscle Activity, Muscle Fatigue and Balance in Male High School Taekwondo Athlete with Deformity of Medial Longitudinal Arch (안쪽세로활 변형을 가진 고교 남자 태권도 선수의 근활성도, 근피로도 및 균형의 평가)

  • Won, Seong-Hwan;Yoo, Kyung-Tae;Lee, Ho-Seong
    • Journal of the Korean Society of Physical Medicine
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    • v.16 no.4
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    • pp.85-93
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    • 2021
  • PURPOSE: This study aimed to examine the evaluation of muscle activity, muscle fatigue and balance in male high school Taekwondo athlete with a deformity of the medial longitudinal arch. METHODS: The 20 male high school Taekwondo athletes participated in the study they have been measured radiographic a medial longitudinal arch and divided into a medial longitudinal arch group (higher than 18.8°; MLA group, n = 12) and control group (lower than 18.8°; CON group, n = 8). All subjects were measured muscle activity (TA, PT, PL and PB), muscle fatigue (TA, PT, PL and PB) and balance (A-, AL-, L-, PL-, P-, PM-, M-, AM-direction and composite score; CS). RESULTS: The muscle activity of TP was significantly higher in MLA group compared to CON group (p = 031) and the muscle fatigue of TA was significantly lower in MLA group compared to CON group (p = .043). However, balance did not show significant differences between the groups. CONCLUSION: These results confirmed that male high school Taekwondo athlete with a deformity of medial longitudinal arch increase TP and decrease TA, but there was no difference on balance.

Comparative Analysis on Blood Fatigue Variables after Isokinetic and Isotonic Exercise Training in Elite Athletes

  • Seo, Seong-Wook;Kim, Kyoung;Im, Sang-Cheol
    • Journal of the Korean Society of Physical Medicine
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    • v.17 no.1
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    • pp.31-39
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    • 2022
  • PURPOSE: This study examined the changes in the blood fatigue variables caused by isokinetic and isotonic exercise training. METHODS: Ten healthy adult males with at least one year of athletic experience participated. The participants performed the isokinetic circuit exercise program first, followed by an isotonic circuit exercise program. A two-hour break was allowed between the isokinetic circuit exercise program and the isotonic circuit exercise program. The circuit exercise program consisted of four items (Squat, Deadlift, Shoulder press, and Bench press). The blood samples were analyzed for the LDH, CPK, and Cortisol levels. RESULTS: The LDH level in the isokinetic group was significantly different from the isotonic group. In particular, the change in LDH level in the isokinetic group was 33.30% lower than that of the isotonic group. The serum CPK level of the isokinetic group showed a 10.03% lower decrease than the isotonic group, but the difference was not significant. The Cortisol level was relatively unchanged in the isotonic group, but it decreased in the isokinetic group. On the other hand, the Cortisol level did not show a significant difference between the two groups. CONCLUSION: The isokinetic group showed alleviation of the three indices, unlike the isotonic group. Further studies associated with the changes in blood fatigue variables through various exercise programs and exercise intensity will be needed.