The Effects of Neurocognitive Ability on Biomechanical Risk Factors of Non-Contact Anterior Cruciate Ligament Injury in Female Athletes

( Sunghe Ha ) 대한운동사협회 2018 대한운동사협회 운동사대회자료집 Vol.2018 No.-

가쪽 발목 염좌 경험이 있는 유소년 운동선수의 착지 점프 시 하지 움직임 패턴 및 가변성

( Sunghe Ha ),( Inje Lee ),( Joo-nyeon Kim ) 한국운동역학회 2023 한국운동역학회지 Vol.33 No.3

Objective: This study examined differences in joint kinematics and movement variability of lower extremity between adolescent athletes with and without lateral ankle sprain (LAS) history during drop vertical jump. Method: Fourteen adolescent athletes with LAS history and 14 controls participated in this study. The independent variable was group while dependent variables were 3D joint kinematics and movement variability of hip, knee, and ankle joint. Ensemble curve analyses were conducted to identify differences in movement strategies between two groups. Results: The LAS group showed that greater eversion during jump phase compared with the control group. Additionally, less movement variability was found in the LAS group during the pre-landing and jump phases in ankle and hip joints compared with the control group. Conclusion: The LAS group may adapt the environmental constraints by reducing the movement variability in ankle and hip joints. However, training programs focusing on recovery of ankle function should be emphasized after LAS because excessive pronation for prevention of LAS during the jump phase may result in reduced performance.

The Relationship between Cognitive Function and Musculoskeletal Injury in Contact Sports

( Sunghe Ha ),( Sae Yong Lee ),( Sang-kyoon Park ) 대한운동사협회 2019 대한운동사협회 운동사대회자료집 Vol.2019 No.-

Relationship Between Neurocognition Level and Neuromuscular Strategy During Landing in Female Recreational Athletes

( Sunghe Ha ),( Sae Yong Lee ) 한국체육학회 2020 International journal of human movement science Vol.14 No.1

If judgment errors regarding ground conditions or fall height occur in the feedforward control process, players can be exposed to the risk of musculoskeletal injury to the lower extremity. This study aimed to investigate the effects of neurocognition level on neuromuscular strategy during landing in female recreational soccer players. Ten female recreational soccer players (age: 21.2 ± 3.4 years, height: 163.8 ± 3.8 cm, body mass: 57.0 ± 8.3 kg) participated in this study. Neurocognition levels were analyzed using the Central Nervous System Vital Signs test, and the muscle activation patterns, angles of the agonist lower extremity, and vertical ground reaction force were analyzed. A Pearson correlation analysis was used to identify the relationship between neurocognition and neuromuscular landing strategy. The results indicate that the neurocognition level correlates with muscle activation and kinematics of the lower extremity. We found a clear correlation between neurocognition scores and integral muscle activation as well as the kinematics of the lower extremity. Moreover, we found that higher neurocognition scores corresponded to an improved neuromuscular landing strategy in regard to deceleration, increased knee stability, and improved shock absorption during landing.

Do the Mechanical Properties of Midsole Affect Body Shock and Stabilization for Lower Extremity During Running?

Sunghe Ha,Sihyun Ryu,Ho Jong Gil 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.2

Objective: The purpose of this study is to examine the relation between the mechanical properties of midsole and stabilization strategies for lower extremity during running. Background: Since stabilization strategies for a human body are to be adjusted according to the mechanical properties of the shoes, such properties of shoes that a runner wears need to be taken into consideration. Method: Mechanical characteristics regarding the midsole cushioning properties (thickness [mm], dwell time [ms], peak acceleration [g], and energy return [%]) of each shoe were investigated by means of an impact tester. Twelve-male participated in the biomechanical experiment. They wore 12 different shoes and ran on the treadmill. To examine the relation between the mechanical properties of midsole and biomechanical variables during running, Pearson"s correlation coefficient was referenced. Results: It turned out that the shoe thickness, dwell time, and peak acceleration were in correlation with one another. During running, the initial maximum vertical ground reaction force (GRF), the Initial peak time of vertical GRF, the loading rate, the cross timing of the braking and propulsion were in correlation with mechanical properties of midsole. The inversion-eversion angle of the ankle joint at the moment of toe off was in correlation with the thickness. The internal rotation-external rotation angle of the knee joint at heel contact was in correlation with the dwell time. Conclusion: While the thickness and dwell time of midsole play positive roles in reducing shock on a human body, there is a significant possibility that they affect the stabilization of the joint of the lower extremity negatively. Application: Midsole thickness and dwell time may reduce the impact on the lower extremity.

Statistical Parametric Mapping을 이용한 시상면에서의 양발 착지와 외발 착지의 전략 차이

Ha, Sunghe,Park, Sang-Kyoon,Lee, Sae Yong 한국운동역학회 2019 한국운동역학회지 Vol.29 No.4

Objective: The purpose of this study was to investigate differences of shock attenuation strategies between double-leg and single-leg landing on sagittal plane using statistical parametric mapping. Method: Nine healthy female professional soccer players (age: 24.0±2.5 yrs, height: 164.9±3.3 cm, weight: 55.7±6.6 kg, career: 11.2±1.4 yrs) were participated in this study. The subjects performed 10 times of double-leg and single-leg landing from the box of 30 cm height onto force plates respectively. The ground reaction force, angle, moment, angular velocity, and power of the ankle, knee, and hip joint on sagittal plane was calculated from initial contact to maximum knee flexion during landing phase. Statistical parametric mapping was used to compare the biomechanical variables of double-leg and single-leg landing of the dominant leg throughout the landing phase. Each mean difference of variables was analyzed using a paired t-test and alpha level was set to 0.05. Results: For the biomechanical variables, significantly increased vertical ground reaction force, plantarflexion moment of the ankle joint, negative ankle joint power and extension moment of the hip joint were found in single-leg landing compared to double-leg landing (p<.05). In addition, the flexion angle and angular velocity of the knee and hip joint in double-leg landing were observed significantly greater than single-leg landing, respectively (p<.05). Conclusion: These findings suggested that negative joint power and plantarflexion moment of the ankle joint can contribute to shock absorption during single-leg landing and may be the factors for preventing the musculoskeletal injuries of the lower extremity by an external force.

접촉스포츠 참여가 은퇴 선수의 신경인지 점수와 이중과제 보행에 미치는 영향

( Sunghe Ha ) 한국운동역학회 2020 한국운동역학회지 Vol.30 No.3

Objective: The aim of this study was to investigate the effect of participation in contact sports on neurocognitive scores, dual-task walking velocity, and cognitive costs in retired athletes. Method: Forty-four retired athletes (mean age = 26.4±5.5 yrs) and thirty-eight controls (mean age = 26.1±4.9 yrs) participated in this study. Neurocognitive score was collected using computerized neurocognitive testing using RehaCom. Gait velocity was collected one single task, four dualtasks, and two multi-tasks using Optogait. Mann-Whitney U test was performed to compared differences in cognitive scores among groups. A mixed-design two-way ANOVA and Bonferroni posthoc test were used to assess the effect of group and walking tasks for each condition. Results: The auditory divided attention of neurocognitive score of retired athletes was higher than the control group (p < 0.05). No statistical differences were observed in the other neurocognitive scores between groups. The changes in walking velocity and cognitive costs according to the dualtask walking tests differed between the two groups (p < 0.05). Conclusion: Although participation in contact sports did not affect the neurocognitive results of retired athletes, it could be confirmed that the reduction in walking velocity and an increase in cognitive costs during dual-task walking. Rather than observing only neurocognitive scores as a single evaluation item for cognitive evaluation of retired athletes in relation to daily life, the application of the dual-task gait test may provide useful information.

Statistical Parametric Mapping을 이용한 시상면에서의 양발 착지와 외발 착지의 전략 차이

( Sunghe Ha ),( Sang-kyoon Park ),( Sae Yong Lee ) 한국운동역학회 2019 한국운동역학회지 Vol.29 No.4

Objective: The purpose of this study was to investigate differences of shock attenuation strategies between double-leg and single-leg landing on sagittal plane using statistical parametric mapping. Method: Nine healthy female professional soccer players (age: 24.0±2.5 yrs, height: 164.9±3.3 cm, weight: 55.7±6.6 kg, career: 11.2±1.4 yrs) were participated in this study. The subjects performed 10 times of double-leg and single-leg landing from the box of 30 cm height onto force plates respectively. The ground reaction force, angle, moment, angular velocity, and power of the ankle, knee, and hip joint on sagittal plane was calculated from initial contact to maximum knee flexion during landing phase. Statistical parametric mapping was used to compare the biomechanical variables of double-leg and single-leg landing of the dominant leg throughout the landing phase. Each mean difference of variables was analyzed using a paired t-test and alpha level was set to 0.05. Results: For the biomechanical variables, significantly increased vertical ground reaction force, plantarflexion moment of the ankle joint, negative ankle joint power and extension moment of the hip joint were found in single-leg landing compared to double-leg landing (p<.05). In addition, the flexion angle and angular velocity of the knee and hip joint in double-leg landing were observed significantly greater than single-leg landing, respectively (p<.05). Conclusion: These findings suggested that negative joint power and plantarflexion moment of the ankle joint can contribute to shock absorption during single-leg landing and may be the factors for preventing the musculoskeletal injuries of the lower extremity by an external force.

국가대표급 스케이트 선수의 점프 동작 시 하지의 비대칭성 분석

하성희 ( Ha Sunghe ),전명규 ( Jun Myung-kyu ),박상균 ( Park Sang-kyoon ) 한국체육대학교 체육과학연구소 2016 스포츠사이언스 Vol.34 No.1

본 연구는 스케이터의 양측 하지의 기능적 비대칭을 점프동작과 하지근력을 통해서 분석하는 것이 목적이다. 국가대표급 쇼트트랙 스피드 스케이팅 선수 13명, 스피드 스케이팅 선수 11명의 점프동작 수행 시 좌.우 하지의 지면반력과 엉덩관절, 무릎관절의 등속성 근기능을 60deg/sec로 측정하였다. 점프동작시 빙상 종목과 성별이 하지의 운동역학적요인에 미치는 영향과 그 차이를 검증하기 위해 이원변량분석 (two-way ANOVA)을 실시하였다. 체공시간은 종목내 남성이 여성에 비해 길게 나타났다 (F(1,20)=552.250, p=.027). 최대지면반력의 비대칭지수는 쇼트트랙 스피드 스케이트 종목이 스피드 스케이트 종목에 비해 우측으로 크게 나타났다 (F(1,20)=852.252, p=.022). 신장성 구간의 충격량 비대칭 지수는 쇼트트랙 스피드 스케이트가 스피드 스케이트에 비대 비대칭이 통계적으로 유의하게 우측으로 크게 나타났다 (F(1,20)=288.589, p=.037). 하지근력의 비대칭은 쇼트트랙 스피드 스케이트의 여자선수들은 우측으로 비대칭이 나타났고 스피드 스케이트의 여자선수들은 반대로 좌측의 비대칭이 크게 나타났다 (p=.002). 그 외 변인에서는 종목과 성별에 따른 차이가 나타나지 않았다. 본 연구결과 하지기능의 비대칭 요인을 통해 경기력 평가와 부상예방을 위한 정량적 자료로 활용될 수 있을 것으로 생각된다. The aim of this study was to analyze asymmetry of lower extremity biomechanics during countermovement jump of elite short track speed skaters and speed skaters. Peak vertical force and peak power were assessed from each extremity using bilateral force plates (Bertec, USA; 1000Hz) during a countermovement jump in 24 Ice skaters (short track speed skaters: age=20(3)years, hight=168(7)cm, mass=63(7)kg, career=13(3)years, 6M/7F; speed skaters: age=20(3)years, hight=174(6)cm, mass=70(11)kg, career=11(3)years, 6M/5F). Muscle strengths of hip and knee joint were measured using Humac Norm (Humac Norm, CSMI, USA; 60deg/sec) in 23 Ice skaters (short track speed skaters: 5M/7F; speed skaters: 6M/5F). Two-way ANOVA was performed to determine the influence of events and gender on asymmetry of lower limb biomechanics during the countermovement jump. Fight time of male showed longer than female (F(1,20)=552.250, p=.027). Asymmetric index of peak vertical ground reaction force in short track speed skaters was demonstrated greater than speed skaters (F(1,20)=852.252, p=.022). Short track speed skate was significantly greater asymmetric index in eccentric phase, compared with speed skaters (F(1,20)=288.589, p=.037). Significant difference between short track speed stakers and speed skaters in asymmetric index of knee extensor indicates stronger right leg in short track speed skaters and stronger left leg in speed skater for female athletes (p=.002). The conclusion of this study was suggested to use an index of predicting performance and preventing injury through asymmetry analysis using countermovement jump.

Measurement of EUV Emission and its Plasma Parameters Generated from the Coaxial PlasmaFocus of Mather and Hypocycloidal Pinched Electrodes

Sunghee Lee,Kyung Ae Lee,Young June Hong,Hansup Uhm,Eun Ha Choi 한국진공학회 2011 한국진공학회 학술발표회초록집 Vol.41 No.-