• 한국운동역학회지
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• 제17권4호
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• pp.141-148
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• 2007

Falls associated with tripping over an obstacle can be dangerous, yet little is known about the strategies used for stepping over obstacles in older Parkinson disease. The purpose of this study was to investigate the lower extremity muscle activity on the obstacle gait according to obstacle height in older Parkinson diseases. The obstacle gait of 7 older Parkinson disease was examined during a 5.0 m approach to, and while stepping over, obstacles of 0, 25, 52, and 152mm. Seven pairs of surface electrodes(Noraxon MyoResearch, USA) were attached to the right-hand side of the body to monitor the adductor longus(AL), gluteus medius(GME), gluteus maximus(GMA), biceps femoris(BF), rectus femoris(RF), gastrocnemius(GA), tibialis anterior(TA). Electromyography data were filtered using a 10Hz to 350 Hz Butterworth band-pass digital filter and normalized to the maximum value in the analyzed phases. A one-way ANOVA for repeated measures was employed for selected electromyography variables to analyze the differences of the height of four obstacles. The results showed significant differences between 0.0mm and 25, 52, and 152mm obstacle height in TA and GA activities during the second phase(swing phase). But the more increase obstacle height, the more not increase the muscle activities. This means that the Parkinson disease stepping over obstacle inefficiency. To prevent and reduce the frequency of falls, elderly Parkinson disease maintained and improved their balance, muscular strength, neuromuscular control and mobility.

• 한국운동역학회지
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• 제22권4호
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• pp.421-428
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• 2012

The purpose of this study was to verify the effects of developed assisting wear which maximize trunk(back) muscle's stretch-shortening effect during backswing and downswing for increasing golf ball carrying distance. Design and fabrication of assistive wear were performed based on the results of analyzed data of trunk EMG activity from the golf drive swings of elite professional male golfers during back swing and downswing phases. After the prototype of wear was produced, surface EMG and Flight scope tests were conducted to verify the effectiveness of the wear for increasing distance to the professional golfers. Results indicated that wearing trial showed significant longer carry distance than the non-wearing trial(p<.001). The carry distance of wearing trial showed an average 229 m compared to the non-wearing trial, the average 225 m. The swing with wearing also produced significantly faster ball speed than the trial without wearing(p<.05). Average 245 Km/h and 244 Km/h were produced for the swing with and without wearing trails, respectively. EMG results also indicated that the muscle activity of left psoas was significantly increased for wearing trial during downswing and near the impact. Thus, this may affect positively to increase club head speed. The activity of the left latissimus dorsi was dramatically increased during the final stage of swing. This generates elongation effect for longer follow-through and increased impulse between club and ball so eventually valid assistance to increase carry distance. Therefore, the developed assisting wear was proved to be effective tool for increasing golf ball carry distance with maximizing trunk(back) muscle's stretch-shortening effect during backswing and downswing.

• 한국운동역학회지
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• 제29권3호
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• pp.185-196
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• 2019

Objective: The aim of this study was to suggest correct and effective way of squat through biomechanical analysis variables on the change of the toe-out angle. Method: 7 high school male weightlifter (age: $17.57{\pm}0.53yrs$, height: $174.0{\pm}3.93cm$, weight: $81.0{\pm}9.17kg$, 1RM: $164.29{\pm}20.7kg$) participated in this study. Results: Angle of the hip joint at E2 was smaller than toe-out angle was in $20^{\circ}$ than in $0^{\circ}$ (p<.05). Angular velocity of the foot joint at E1 and E3 was quicker that in $10^{\circ}$ than in $30^{\circ}$ (p<.05). Anterior-posterior stability index was greater that toe-out angle was in $30^{\circ}$ than in $0^{\circ}$ (p<.05). In average iEMG of flexion phase, VM of right, left leg showed high activity at toe-out angle $30^{\circ}$. In average iEMG of flexion phase, extension phase and in peak iEMG, RF of right leg, VM and VL of left leg showed high activity at all of the toe-out angles. In average iEMG of flexion phase, extension phase and in peak iEMG, all of the muscles activity of right leg showed high in $10^{\circ}$ and low in $0^{\circ}$, $30^{\circ}$. Conclusion: It is judged that setting the toe-out angle $10^{\circ}$ in squat help to efficiently use muscles and ensure stability.

• 한국조경학회지
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• 제44권6호
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• pp.26-39
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• 2016

본 연구는 우리나라 도시공원에서 스포츠 활동 중 하나인 스케이트보드 활동이 어떻게 공간적으로 발달하게 되었는지 살펴보고자 한다. 이 과정을 통해 도시공원이 동적 활동을 수용하는데 나타나는 특징과 시사점을 도출해보고자 한다. 연구방법은 신문기사에 나타난 스케이트보드 문화 유입에서부터 공간 설치에 관한 내용을 담론분석을 통해 도출하고, 시기별로 어떠한 요인에 의해 공간 생성 혹은 소멸로 이어졌는지 알아보았다. 연구의 결과는 다음과 같다. 스케이트보드 행태가 공원에서 일부 공간으로 자리 잡은 데는 세 가지 원인으로 설명할 수 있다. 첫째, 도시 공원이 스케이트보드 이용에 적절한 장소로 이용자와 운영자 모두 받아드렸고, 이 이용에 대한 긍정적 시대 담론과 결합해 공원정비가 이루어졌다. 둘째, 시대적으로 다른 신생, 혹은 대중적 스포츠와 흐름을 같이 하면서 복합적인 용도 공간 창출이 가능할 때 스케이트 파크가 집중적으로 발달하였다. 셋째, 신도시간의 문화 비교 양상과 공원 유치를 스포츠 마케팅의 수단이 되어 지역경제를 부흥하려는 양상을 볼 수 있고, 이때 스케이트보드 공원의 보급이 이루어졌다. 반대로 공간 소멸로 이어지는 원인은 첫째, 일부 공간을 점유하는 방식이나 장소의 행태가 부딪치는 공간은 소멸로 이어졌다. 둘째, 이용자 행태를 담지 못한 설비의 부적절함과 일시적이고 이벤트성의 대회, 행태만을 위한 설비가 공간 자체를 오래 이용할 수 없는 설비로 이어졌다. 셋째, 메가 이벤트의 개최와는 상관없이 국내에서는 이런 기물을 지속적으로 활용할 만큼 문화현상이 지속되지 않았고, 공간용도와 다른 행태를 유도하는 스케이트보드 문화가 이어져 전용 공간에 대한 관심이 멀어지게 되었다. 분석 내용을 바탕으로 한 도시공원과 스포츠 활동의 수용에 대한 논의는 다음과 같은 과제를 논할 수 있다. 첫째, 일시적인 이슈와 경향 등 공간의 설정에 대한 담론을 뛰어넘는 스포츠 활동을 제공할 수 있는 계획 설정이 부족하다. 둘째, 공간적의 설정에서부터 생성 이후에 따라오는 공원에서 스포츠 활동 운영에 있어서 공간과 활동의 상호작용이 부족하다. 셋째, 다양하게 나타나는 스포츠 활동과 기존 공간의 문제점을 적극적으로 다양한 시도로 해결하는 움직임이 필요하다. 본 연구는 공원에서 스포츠 활동의 수용과 발달에 대한 고찰을 통해 현 도시공원의 체재에서 동적 행태를 수용하는 동안 나타나는 상황들을 파악해 봄으로써 스포츠를 공원에 계획하는 것에 대한 문제를 제고해볼 수 있는 연구가 될 수 있도록 하였다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권12호
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• pp.5295-5302
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• 2016

Objectives: A physically active lifestyle is important for cancer survivors. Therefore, this study was conducted to 1) provide population-based estimates of the prevalence of physical activity and sitting time, and 2) their correlates in Korean cancer survivors. Materials and Methods: This study analyzed a cancer survivor subsample (N=1,482) from 2008-2013 Korea National Health and Nutrition Examination Survey (KNHANES), data selected with a complex sampling design. Overall and subgroup-specific prevalences of physical activity and sitting time were estimated. Correlates of moderate- to vigorous-intensity physical activity ( MVPA) and sitting time were tested using age-group-specific hierarchical multiple regression models. Results: Overall adherence rate to physical activity guidelines was 34.9% (95% CI=31.5-38.4). Age-group-specific adherence rates were 41.1% (95% CI=36.3-45.9) in adults (30-64 years old), and 25.3% (95% CI=21.0-25.3) in older adults (65 years or older). Adults spent 213.33 minutes (95% CI=172.4-254.3) per week on MVPA and 55.3 minutes (95% CI=36.4-64.6) on sitting time per day. In adults, sitting time was significantly associated with employed status (B=28.0, p=0.046), smoking (B=-47.4, p=0.020), and number of comorbidity conditions (B=-13, p=.037). MVPA was significantly associated with marital status (B=134.9, p<0.001), employment status (B=98.12, p=.046), and years since cancer diagnosis (B=104.7, p=0.015). Older adults spent 162.2 minutes (95% CI=119.5-204.8) per week on MVPA and 63.0 minutes (95% CI=45.0-89.5) on sitting time per day. Their significant correlates were sex (B= -45.2, p=0.014), smoking (B=-70.14, p<0.001), and years since cancer diagnosis (B=37.0, p=0.024). Age (B=5.8, p=0.042) and marital status (B=83.8, p=0.033) were also significantly associated with MVPA in older adults. Conclusion: A majority of Korean cancer survivors do not sufficiently participate in physical activity. In general, older, unhealthier, non-working, and being unmarried were risk factors for physical inactivity. While this study informs public health policy makers and practitioners about physical activity intervention demand for cancer survivors, future investigations should address psychosocial mediators to better inform intervention programs.

• 식품보건융합연구
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• 제5권5호
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• pp.1-10
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• 2019

This study examined the physical activity and dietary patterns of university students in Nairobi County and compared to their weight status. The study was a cross-sectional analytical design with a sample of 260 undergraduate students randomly selected from two private and two public universities. A semi-structured questionnaire was used to gather information from students. Students weight and height measurements were also obtained. Data was analyzed using SPSS version 22. The study results showed that 53.5% of the students met the recommended levels of moderate physical activity and 18.8% of the students met the recommended levels of vigorous physical activity. Majority of the students consumed fast foods sweetened beverages and pastries most times in a week. The study also showed that 31.2% of the students were overweight and 6.2% were obese. The study reveals that most students did not achieve the recommended levels of vigorous physical activity and showed some poor dietary patterns. Findings show clear evidence of high prevalence of overweight among university students but focus should be on fitness rather than fatness. Efforts should be made to promote physical activity participation and good dietary practices within university environments.

• 한국콘텐츠학회논문지
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• 제9권6호
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• pp.379-389
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• 2009

본 연구는 대구, 경북지역의 실내 수영장에서 수영프로그램에 참여하고 있는 여성을 대상으로 여성의 스포츠여가활동을 통한 신체적 자기효능감이 일반적 자기효능감과 생활만족에 미치는 영향을 분석하고자 수행되었다. 연구결과에 의하면 첫째, 신체적 자기효능감은 모든 일반적 자기효능감 변수에 유의적인 영향을 미치는 것으로 나타났다. 즉 신체적 자기효능감은 자신감, 끈기/노력, 대인관계, 상황극복에 모두 유의적인 영향을 미치는 것으로 볼 수 있다. 둘째, 신체적 자기효능감은 생활만족에 유의적인 영향을 미치는 것으로 나타났다. 셋째, 일반적 자기효능감은 생활만족에 부분적인 영향을 미치는 것으로 나타났으며 자신감, 대인관계 변수는 생활만족에 유의적인 영향을 미치지 않았으며, 상황극복, 끈기/노력 변수는 유의적인 영향을 미치는 것으로 나타났다. 또한 40세 이하의 여성에서만 신체적 자기효능감이 생활만족에 유의적인 영향을 미치는 것으로 나타났으며 일반적 자기효능감 변수 중 40세 이상에서는 끈기/노력, 40세 이하의 여성에서는 상황극복과 끈기/노력 변수가 생활만족에 유의적인 영향을 미치는 것으로 나타났다.

• 한국운동역학회지
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• 제18권2호
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• pp.115-124
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• 2008

본 연구는 행군 시 발보장구 착용이 하지 근육 활동에 미치는 영향을 알아보는데 목적이 있다. 과회내족과 정상족을 선정하여 트레드밀에서 4.5km/h의 속도로 걷게 하였고 이때 근전도기를 이용하여 하지근육의 근육신호를 수집, 분석하였다. 수집한 데이터를 평균적분근전도와 스펙트럼 분석을 통해 근활성도와 피로도를 알아보았고 SPSS 12.0을 이용하여 통계분석하였다. 실험 결과는 과회내족이 정상족보다 행군 시 근 활성이 큰 것으로 나타났고, 보장구 착용 시 근 활성과 피로도가 줄어드는 경향을 나타냈다. 특히 전경골근과 장비골근의 근육활성 감소와 피로도 감소가 통계적으로 유의한 차이를 나타냈다. 결과적으로 과회내족은 장시간 행군 시 발보장구 착용이 피로도 감소에 효과적이며 이는 잠재적인 하지 근골격계 상해 예방에 도움이 될 것으로 사료된다.

• 한국운동역학회지
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• 제25권3호
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• pp.323-333
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• 2015

Objective : The purpose of this study was to investigate the changes of gait patterns and muscle activations with increased loads during stair walking. Also, it can be used as descriptive data about continuous stair walking in a real life setting. Method : Twelve sedentary young male adults(Age: $27.0{\pm}1.8yrs$, Weight: $65.8{\pm}9.9kg$) without any lower extremity injuries participated in this study. Participants performed stair walking up 7 floors and their ascending and descending motion on each floor was analyzed. A wireless electromyography(EMG) were attached on the Rectus Femoris(RF), Biceps Femoris(BF), Gastrocnemius(GN), Tibialis Anterior(TA) muscle to calculate integrated EMG(iEMG), median frequency(MDF) and co-contraction index(CI). Chest and left heel accelerometer signal were recorded by wireless accelerometer and those were used to calculate approximate entropy(ApEn) for analyzing gait pattern. All analyses were performed with SPSS 21.0 and for repeated measured ANOVA and Post-hoc was LSD. Results : During ascending stairs, there were a statistically significant difference in Walking time between 1-2nd and other floors(p=.000), GN iEMG between 2-3th and 6-7th(p=.043) floor, TA MDF between 1-2nd and 5-6th(p=.030), 6-7th(p=.015) floor and TA/GN CI between 2-3th and 6-7th(p=.038) floor and ApEn between 1-2nd and 6-7th(x: p=.003, y: p=.005, z: p=.006) floor. During descending stairs, there were a statistically significant difference in TA iEMG between the 6-5th and 3-2nd(p=.026) floor, and for the ApEn between the 1-2nd and 6-7th(x: p=.037, y: p=.000, z: p=.000) floor. Conclusion : Subjects showed more regular pattern and muscle activation response caused by regularity during ascending stairs. Regularity during the first part of stair-descending could be a sign of adaptation; however, complexity during the second part could be a strategy to decrease the impact.

• 한국운동역학회지
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• 제31권2호
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• pp.133-139
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• 2021

Objective: This study aims to verify the conventional deadlift motions using by two different grips, thereby elucidating the grounds for effective training methods that can minimize the risk of injury. Method: Total of 18 healthy young adults were recruited for this study (age: 25.11±2.19 yrs., height: 175.67±5.22 cm, body mass: 78.5±8.09 kg, 1-RM: 125.75±19.48 kg). All participants were asked to perform conventional deadlift with two types of grips which are overhand grip (OG) and underhand grip (UG). In each grip, participant perform the deadlift with 50% and 80% of the pre-measured 1-RM. A 3-dimensional motion analysis with 8 infrared cameras and 3 channels of EMG was performed in this study. A two-way ANOVA (group × load) with repeated measure was used for statistical verification. The significant level was set at α=.05. Results: There were significant differences in grip type and weight on the right shoulder joint, and only significant difference in grip on the left shoulder joint (p<.05). The hip joint ROM was significantly increased as the weight increased in both types of grips on phase 1, while the ROM of hip joint was significantly decreased as the weight increased only in the case of OG on phase 2 (p<.05). In case of the OG, as the weight, increased significantly increased L1 ROM and L3 ROM were revealed on phase 1 and phase 2, respectively (p<.05). Moreover, as the weight increased, UG revealed significantly decreased L5 ROM on phase 1, while both grips showed significantly increased ROM on phase 2 (p<.05). In addition, the erector spinae and the biceps femoris, which are synergist for the motion, showed a significant difference in both types of grip according to the weight (p<.05). The muscle activity ratio of gluteus maximus/biceps femoris showed a significant difference only in the UG according to the weight (p<.05). Conclusion: In conclusion, beginners might be suggested to use the UG for maintaining the neutral state of the lumbar spine and focus on the gluteus maximus muscle, which is the main activation muscle. For the experts, it may recommend alternative use of the OG and UG according to the training purpose to minimize the compensation effect.