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( Seungbum Park ),( Kyungdeuk Lee ),( Daewoong Kim ),( Junghyeon Yoo ),( Jaemin Jung ),( Kyunghwan Park ),( Sungwon Park ),( Jinhoon Kim ) 한국운동역학회 2016 한국운동역학회지 Vol.26 No.3
Objective: The aim of this study was to analyze effects of the toe-spring angle of bobsleigh shoes on start speed lap time to develop Korean-specific bobsled shoes suitable for winter environments and for domestic players on the basis of sports science and optimized biomechanical performance. Method: Seven Korean bobsleigh athletes participated in this study, with three pairs of sprint spikes from three companies (Type A, Type B, Type C). To analyze sprint lap time and forefoot bending angle for each shoe, participants were instructed to drag a sled 15 meters from the start line at a maximum sprint. forefoot bending angle was collected by a high speed camera, and lap time speed was measured. Results: Lap time for type B shoes was 3.52±0.17 sec, type A was 3.55±0.19 sec, and type C was 3.56±0.18 sec. Forefoot bending angles were: angle 1, 6.88±5.55°; angle 2, 9.23±6.38°; angle 3, 15.56±5.39°; angle 4, 9.54±3.85°; angle 5, 9.22±5.08°; angle 6, 7.66±6.44°; and angle 7, 4.30±6.24° (p<.001). Forefoot bending in angle 3 was as follows: type A, 16.47±6.01°; type B, 14.30±4.96°; and type C, 15.90±5.17°. Conclusion: Hard outsoles and midsoles are better than soft type for reduced start lap time when developing a prototype Korean bobsled shoe.
( Seungbum Wi ),( Sun Hye Shin ),( Byung Woo Jhun ),( Hongseok Yoo ),( Byeong-ho Jeong ),( Kyung Jong Lee ),( Hojoong Kim ),( O Jung Kwon ),( Sang-won Um ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Background Endobronchial ultrasound guided transbronchial needle aspiration (EBUS-TBNA) can evaluate not only mediastinal lymph nodes (LNs) but also hilar/interlobar/lobar (station 10/11/12) LNs, which is the unique advantage of EBUS-TBNA over mediastinoscopy. The purpose of this study was to determine the clinical utility of EBUS-TBNA in the diagnosis and staging of station 10/11/12 in patients with primary lung cancer. Methods From 2015 to 2019, consecutive subjects with confirmed or suspected primary lung cancer who underwent EBUS-TBNA for station 10/11/12 were retrospectively analyzed. The subjects with LNs which had benign Results from EBUS-TBNA but did not undergo surgical sampling/clinical follow-up or received radiotherapy/chemotherapy were excluded. Results During a study period, a total of 888 lymph nodes in 796 patients were finally included in the analysis (Figure 1). The overall diagnostic sensitivity, specificity, accuracy, negative predictive value (NPV), and positive predictive value (PPV) of EBUS-TBNA for station 10/11/12 were 95.9%, 100%, 97.4%, 93.5%, and 100%, respectively. Diagnostic sensitivity was significantly lower in LN size <10mm group (90.7%) than in LN size ≥10mm group (97.8%) (p <0.001). NPV of station 10 (82.4%) was significantly lower compared to station 11/12 (94.0%) (p <0.001). Among 133 lymph nodes located at N3 position in 125 patients, 32 malignant LNs were identified in 32 patients by EBUS-TBNA. Conclusions EBUS-TBNA can accurately evaluate station 10, 11, and 12 in patients with primary lung cancer. In our cohort, 4.0 % of study patients were confirmed as N3 disease by EBUS-TBNA for station 10/11/12.
( Seungbum Park ),( Kyungdeuk Lee ),( Daewoong Kim ),( Junghyeon Yoo ),( Jaemin Jung ),( Kyunghwan Park ) 한국운동역학회 2017 한국운동역학회지 Vol.27 No.3
Objective: The aim of this study was to analyze the effects of bobsleigh shoes on the lower extremity range of motion and start speed lap time and to develop bobsleigh shoes suitable for winter environments and Korean players based on sports science and optimized biomechanical performance. Background: The bobsleigh shoes used in the start section of the sport are one of the most important equipment for improving athletes` performances. Despite the importance of the start section, there are no shoes that are specifically designed for Korean bobsleigh athletes. Thus, Korean athletes have to wear sprint spike shoes instead of bobsleigh shoes to practice the start. Method: The subjects included four bobsleigh athletes from the Gangwon Province Bobsleigh Skeleton Federation. The study selected the bobsleigh shoe type A (company A) and type B (company B). We analyzed the lower extremity range of motion and sprint time (start line to 10 m) using a Motion Analysis System (USA). Results: In the measurement of the time required for the bobsleigh start section (10 m), the type A shoes demonstrated the fastest section record by 2.765±0.086 sec and yielded more efficient movements, hip and knee flexion, hip extension, ankle dorsiflexion, plantar flexion, and inversion than the type B shoes. Conclusion: Type A shoes can yield a better performance via effective lower extremity movements in the bobsleigh start section. Application: In the future, functional analysis should be conducted by comparing the upper material properties, comfort, and muscle fatigue of bobsleigh shoes based on the Type A shoes to develop such shoes suitable for Koreans.
( Seungbum Park ),( Kyungdeuklee ),( Daewoongkim ),( Junghyeonyoo ),( Jaeminjung ),( Kyunghwanpark ) 한국운동역학회 2017 한국운동역학회지 Vol.27 No.4
Objective: The bobsleigh shoes used in the start section are one of the most important equipment for improving the competition. Despite the importance of the start section, there are no shoes that are specific for bobsleigh athletes in Korea and Korean athletes have to wear sprint spike shoes and practice the start instead of wearing bobsleigh shoes. The objective of the present study was to provide data for improving the performance of Korean bobsleigh athletes by investigating the differences in their split time, plantar pressure, and forefoot bending angle based on skill levels at the start of a run under the same conditions as training conditions. Method: Six Korean bobsleigh athletes were divided into two groups, superior (n=3) and non-superior (n=3). A digital speedometer measured the split time at the start; the Pedar-X system (Novel, Germany) measured plantar pressure. Plantar pressures and split times were measured as the athletes pushed a bobsleigh and sprinted at full speed from the start line to the 10-m mark on the bobsleigh track. An ultra-high-speed camera was used to measure the forefoot bending angle during the start phase. Results: Significant between-group differences were found in split times (p<.000; superior = 2.38 s, non-superior = 2.52 s). The superior group had a larger rearfoot (p<.05) contact area, maximum rearfoot force (p<.01), and a larger change in angles 3 and 4 (p<.05). Conclusion: At the start of a bobsleigh run, proper use of the rearfoot for achieving effective driving force and increasing frictional resistance through a wider frictional force can shorten start time.