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Ko, Jupil Korean Society of Sport Biomechanics 2017 한국운동역학회지 Vol.27 No.3
Objective: The Star Excursion Balance Test (SEBT) and Y-Balance Test (YBT) have been commonly applied to measure dynamic postural stability ability. These two tests are utilized interchangeably in various settings. However, they could in fact require different movements to assess dynamic postural stability, as one uses a platform and different measuring techniques than the other. The purpose of this study was to determine if there was a significant difference in the kinematic patterns in physically active population while performing the SEBT and the YBT. Method: Seventy participants performed in the Anterior (AN), Posteromedial (PM), and Posterolateral (PL) directions of the SEBT and the YBT. The kinematics of hip, knee, and ankle in sagittal plane was calculated and analyzed. Paired-sample t-tests were performed to compare joint angular displacement in the ankle, knee, and hip between the SEBT and the YBT. Results: Significant differences in angular displacement at the hip, knee, and ankle joints in the sagittal plane between performance on the SEBT and on the YBT were observed. Conclusion: Clinicians and researchers should not apply these dynamic postural control tasks interchangeably from one task to another. There appear to be kinematic pattern differences between tests in healthy physical active population.
( Jupil Ko ) 한국운동역학회 2017 한국운동역학회지 Vol.27 No.3
Objective: The Star Excursion Balance Test (SEBT) and Y-Balance Test (YBT) have been commonly applied to measure dynamic postural stability ability. These two tests are utilized interchangeably in various settings. However, they could in fact require different movements to assess dynamic postural stability, as one uses a platform and different measuring techniques than the other. The purpose of this study was to determine if there was a significant difference in the kinematic patterns in physically active population while performing the SEBT and the YBT. Method: Seventy participants performed in the Anterior (AN), Posteromedial (PM), and Posterolateral (PL) directions of the SEBT and the YBT. The kinematics of hip, knee, and ankle in sagittal plane was calculated and analyzed. Paired-sample t-tests were performed to compare joint angular displacement in the ankle, knee, and hip between the SEBT and the YBT. Results: Significant differences in angular displacement at the hip, knee, and ankle joints in the sagittal plane between performance on the SEBT and on the YBT were observed. Conclusion: Clinicians and researchers should not apply these dynamic postural control tasks interchangeably from one task to another. There appear to be kinematic pattern differences between tests in healthy physical active population.
Lumbar Disc Injury: Mechanisms and Intervention Options
( Jim Schilling ),( Jupil Ko ),( Seung-taek Lim ) 한국스포츠정책과학원 2021 International Journal of Applied Sports Sciences Vol.33 No.2
Low back pain is prevalent in sport and the lumbar disc is a pain generator. Conservative care of these physically demanding patients is not consistent as outcome data has not established optimal strategies. Investigating disc injury mechanisms using experimental models will contribute to the creation of treatment strategies that will take into effect movements to avoid and minimize to reduce unwanted strain on the injured tissues throughout the recovery process. Additionally, how disc tissue acquires nutrition would help provide insight into activities that may facilitate the ability of disc tissue to sustain health and promote optimal healing. Rotational forces and compression in trunk-flexed positions may inflict injury to the annulus and endplate structures. Activity to facilitate nutrients through the endplate into the nucleus of the disc and restriction of exasperating movements may be effective in returning athletes to their desired levels of performance efficiently. The purpose of this review is to inquire possible disc injury mechanisms and how they occur in sport. It will also address recommendations for treatment interventions based on disc healing and metabolism evidence.
오버헤드 선수를 위한 어깨 안정화 훈련: 운동 차례 (Review)
( Jim Schilling ),( Jupil Ko ) 인천대학교 스포츠과학연구소 2021 스포츠科學硏究誌 Vol.34 No.0
Context: Glenohumeral joint instability, primarily anteriorly, is a common problem that can predispose the shoulder to conditions such as secondary and internal impingement. These conditions are experienced frequently with overhead athletes and can both negatively impact their performance and cost significant time away from sport. Objectives: The purpose of this review is to introduce specific types of strengthening and sensorimotor control exercises in a predetermined sequence that are effective in improving dynamic stability to the scapulothoracic articulation and glenohumeral joint. Data Sources: PubMed and Google Scholar databases were searched without limitations from inception until December 2021 for interventions relating to glenohumeral joint stability exercises. Findings: Eccentric strengthening, closed kinetic chain, balance, plyometric and perturbation training all contribute to improvement in joint dynamic stability. Conclusions: The specific types of strengthening and sensorimotor control exercises introduced in this review are effective in providing dynamic stability to the glenohumeral joint. These exercises can be used in the prevention and treatment of conditions encountered by athletes in all sports involving overhead movements.
The Effect of a Short Foot Eccentric Endurance Exercise on Foot Center of Pressure: A Pilot study
( Jim Schilling ),( Bobby Gragston ),( Bryan Dunlavey ),( Jupil Ko ) 한국운동생리학회 2021 운동과학 Vol.30 No.3
PURPOSE: This study aimed to investigate the effect of a 5-week short foot eccentric endurance training program on the foot center of pressure measures in healthy university graduate students. METHODS: Eleven healthy students between the ages of 18 and 35 years (n=11, 3 males, 8 females; mean age 26.5±2.5 years; BMI 23.9±2.6 kg/㎡) were included in the study. The participants volunteered in a 5-week progressive eccentric contraction short foot exercise program performed three times per week. The main outcome pressure measurements pre- and post-intervention in static double leg stance were measured using a MatScan<sup>®</sup> Pressure Mapping System. RESULTS: Statistically significant differences were found in the base of support (p=.002, ES=2.59), time to boundary (p=.024, ES=1.63), and overall minima measures (p=.05, ES=1.36) pre- and post-intervention. CONCLUSIONS: A 5-week progressive eccentric contraction short foot exercise program significantly decreased the center of pressure excursion measures, demonstrating improved postural control.