Korean Journal of Sport Biomechanics最新文献

{"title":"Three-dimensional Kinematic Analysis of the Yurchenko Layout with 360-degree Twist in Female Vaults: Deterministic Model and Judges' Scores","authors":"Cheol-hee Park, Young-Kwan Kim","doi":"10.5103/KJSB.2017.27.1.9","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.9","url":null,"abstract":"The Yurchenko vault was first introduced by Natalia Yurchenko, a Soviet gymnast, in the 1982 World Cup (Carlton, 1988; Langsley, 1983). It comprises a round-off entry onto the springboard, followed by a back handspring with turns onto the vault table for the post-flight (Yoon, 2003). Since its introduction, numerous female gymnasts have attempted to master this technique, with 89 out of 149 vault techniques being the Yurchenko vault in the 1988 Seoul Olympics (Kwon, Fortney, & Shin, 1990). However, some athletes avoided this technique at that time due to a high risk of injury, as the horizontal configuration of the old vaulting horse created little space for hand contact and the back handspring entry onto the horse gave the gymnast no visual approach to the contact area. The change to the new vaulting horse increased the horse contact area, rapidly popularizing the Yurchenko vault. Currently, it accounts for more than 70% of the vaults performed by female athletes in international competitions, and it has become a comparably essential technique among female athletes in national competitions in Korea as well (Kim & Kim, 2011; Yeo, Kim, & Kim, 2011). One reason behind its popularity among female athletes is speculated to be that it is easier to create angular momentum in the sagittal plane with the Yurchenko vault than with other techniques, thereby being more useful for female athletes, who tend to have weaker blocking on the horse (Park & Kim, 2016). In the early stages, simple Yurchenko layout vaults were the most popular, but Yurchenko layout vaults with a twist began to gain popularity. Athletes performed layouts with 360° twist to even 720° or greater twist; in 2016 Rio Olympic Games, Simone Biles, a US gymnast, earned the gold medal with a Yurchenko layout with a 900° twist (Park & Kim, 2016; Seo, 2016; Yeo, 2006). Unfortunately, however, Korean female gymnasts mostly perform a 360° twisting layout, which corresponds to 5.0 points in the International Federation of Gymnastics (FIG) code of point, widening the technical competency gap from world-class competitors (FIG, 2013). Particularly, there has been no Korean female Korean Journal of Sport Biomechanics 2017; 27(1): 9-18 http://dx.doi.org/10.5103/KJSB.2017.27.1.9 http://e-kjsb.org eISSN 2093-9752 ORIGINAL","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126933407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ORIGINAL Lower Extremities' Joint Stability during the Elderly Woman's Walking","authors":"Jiseon Ryu","doi":"10.5103/KJSB.2017.27.1.45","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.45","url":null,"abstract":"Objective: The aim of this study was to investigate the periodicity of the lower extremity joint flexion/ extension angle to compare the local stability between young and elderly women during walking on a treadmill. Method: Eighteen young women (mean age=21.2 ± 1.6 y; mean mass=57.1 ± 6.1 kg; mean height=1.61 ± 0.04 m) and 18 elderly women (mean age=66.4 ± 1.2 y; mean mass=55.4 ± 8.3 kg; mean height=1.56 ± 0.04 m) participated in this study. Approximate entropy (ApEn) was used to determine the periodicity in the lower limb joint angles. Results: The ApEn values of the two groups were statistically greater in the surrogate data test than in the original time series data ( p <.05). The periodicity of the hip and ankle flexion/extension angles decreased in the elderly women group compared with the young women group ( p <.05). The periodicity of the lower extremity joint flexion/extension angle showed that the ankle joint increased dominatingly in both groups ( p <.05); the hip joint decreased compared with the knee joint in the young women group; and the knee joint decreased compared with the hip joint in the elderly women group ( p <.05). Conclusion: These results suggest that the lower extremity joint flexion/extension angles of the young and elderly women during walking contained random noises as well as biological signals. In addition, the differences in the periodicity in the lower extremity joint between the young and elderly women may provide some insight in predicting potential falls and be used as a characteristic indicator for determining local stability in elderly women during walking.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122425885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Upright Body Exercise on Postural Balance and Foot Plantar Pressure in Elderly Women","authors":"Chan-hee Kim, J. Lee, Jeongok Yang, Bom-jin Lee, Eui-Suk Kim, Kyung-Hee Woo, Jin-Suk Park","doi":"10.5103/KJSB.2017.27.1.59","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.59","url":null,"abstract":"South Korea has become an aging society, with the elderly population (65 years and above) accounting for 12.6% of the total population in 2015. In 2018, it is predicted that South Korea will be an aged society, with the elderly accounting for 14.3% of the population. Furthermore, the elderly population is estimated to account for 24.3% in 2030, making South Korea a super-aged society (Korea Statistics, 2015). The average healthy life expectancy in South Korea is currently 73 years, which is 9.3 years shorter than the average life expectancy of 82.3 years (as of 2016) (WHO, 2016). The life expectancies indicate that about 10 years are spent fighting diseases during the elderly years. Medical costs during this period are rapidly becoming a social problem and reduced physical abilities in the elderly decrease their qualities of life (Kim, Lee, & Lee, 2010). The most prominent problem arising from the decreased independent physical abilities of the elderly is the increase in falls (Regterschot et al., 2014). Falls are the most common problem seen among the elderly, causing small injuries such as bruises and sprains to large injuries such as fractures or dislocations (Rubenstein, 2006). Elderly who experience severe injuries such as pelvic fractures cannot recover their physical abilities (Tinetti, Speechley, & Hinter, 1988). These severe fractures also lead to death in 37% of the elderly (Korea Statistics, 2015). Therefore, falling is a serious issue that influences the satisfaction level of the elderly (WHO, 2008). Elderly women are especially prone to early decreases in lower limb muscle strength compared to men (Cushnaghan, Janet, & Dieppe, 1991), which increases their relative numbers of musculoskeletal diseases such as arthritis, balance problems, and problems in the main joints such as the pelvic and knee joints (Nevitt et al., 1994). Foot health, which is important for balance, is necessary for weight bearing, gait, and other independent activities. Therefore, maintenance of foot health is important for the wellness of the main joints (Kim, Kim, & Bang, 2011). Foot problems may cause foot pain and ankle weakness, which decreases physical abilities, such as stair climbing, in the elderly. Furthermore, foot problems negatively affect the maintenance of body balance (Menz, Hylton, & Lord, 2001) and make gait difficult (Dunn et al., 2004). Foot problems, which are closely related to the overall body balance, cause the body balance to systematically collapse (Eric, 2003). The feet bear the weight of the body. Therefore, problems with the structure of the feet cause body imbalances such as rotation of the trunk or the pelvis. These imbalances cause pain in various parts of the body and affect the chain structure of the knee followed by the waist, pelvis, back, and neck (Cho, 2010). Among the factors that negatively affect balance in the elderly, loss of muscle strength and joint mobility increase the risk of falling. Therefore, maintenance of postur","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132797745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Changes in Stride Length, Time, and Electromyography Finding Depending on Athletic Crouch Start Method","authors":"Kyung-Ill Lee, Wan-ki Hong, Eunggyu Kim","doi":"10.5103/KJSB.2017.27.1.75","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.75","url":null,"abstract":"Objective: The purpose of this study was to compare and analyze the kinematic variables and electromyography (EMG) findings that change with varying characteristics of crouch start and feedback provision, and to provide the fundamental data for record improvement in 400 mH. Method: Four short-distance runners participated in the experiment. The analyzed variables were elapsed time per interval, stride length, and muscle activities in three lower limb muscles. These variables were analyzed by using Kwon3d XP and Noraxon Myoresearch. The participants were subjected to three conditions, including two conditions that relate to the thrusting foot on the rear block and another condition pertinent to feedback provision. Results: In terms of a one-step interval, the elapsed time in condition A was longer than that in condition B, and the one after the feedback was the longest. The stride length of a one-step interval was the longest in condition A. The stride length of a two-step interval was the shortest in condition A. The muscle activity during a one-step interval showed differences in vastus medialis and medial gastrocnemius, with condition A being the highest. Conclusion: When the non-dominant left foot was located at the back, negative results were observed in terms of elapsed time and stride length. Moreover, an imbalance in muscle activity was observed between the left and right feet when the left foot was placed at the back. As a result, significant differences in elapsed time, stride length, and muscle activity were observed depending on the foot placed on the rear block. In conclusion, we identified the characteristics of crouch start in 400 mH, and a specialized program must be suggested.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"386 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123508620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Statistical Model for Marker Position in Biomechanics","authors":"Jin-uk Kim","doi":"10.5103/KJSB.2017.27.1.67","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.67","url":null,"abstract":"testing uncertainty parameters and validity of model. The present study examined the statistical model of segment marker positions observed from images of human body joint motion. The objective of the present study was to examine linear models related to CoR estimation and to identify the strengths and weaknesses of the models for applying an appropriate general linear model that shows Objective: The purpose of this study was to apply a general linear model in statistics to marker position vectors used to study human joint rotational motion in biomechanics. Method: For this purpose, a linear model that represents the effect of the center of hip joint rotation and the rotation of the marker position on the response was formulated. Five male subjects performed hip joint functional motions, and the positions of nine markers attached on the thigh with respect to the pelvic coordinate system were acquired at the same time. With the nine marker positions, the center of hip joint rotation and marker positions on the thigh were estimated as parameters in the general linear model. Results: After examining the fitted model, this model did not fit the data appropriately. Conclusion: A refined model is required to take into account specific characteristics of longitudinal data and other covariates such as soft tissue artefacts.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121314391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between Ground Reaction Force and Attack Time According to the Position of Hand Segments during Counter Attack in Kendo","authors":"Seung-Hyun Hyun, H. Jin, Che-Cheong Ryew","doi":"10.5103/KJSB.2017.27.1.1","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.1","url":null,"abstract":"The variability of sports performance is important not only in team matches (Gregson, Drust, Atkinson, & Salvo, 2010; James, Mellalieu, & Jones, 2005) but also in individual matches (Montelpare, McPherson, & Puumala, 2013; O'Donoghue, 2005). Sports performance factors are not as stable as physical measurements or physical examination results (Ogle & O'Donoghue, 2015). Although diverse factors can affect the variability, the biggest factor is the outstanding opponent (McGarry & Franks, 1994). Several sports such as Taekwondo, Judo, Hapkido, and Wushu require stable defenses and swift attacks under different conditions set by the opponent. Among these sports, it is difficult to predict the outcomes of a Kendo match because the outcomes are instantly decided by a valid hit with bamboo swords. Kendo literally means \"the way of the sword\" (Ogle & O'Donoghue, 2015). Kendo requires the alignment of the synchronization of the spirit, sword, and body. In a Kendo match, the fighter scores by striking or thrusting first (Min, Bae, & Lee, 2001). To win, the fighter needs to use diverse attack techniques and high precision (Min et al., 2001). Broadly, two types of attacks, namely attacking movements and counter-attacks, lead to scoring. Standard attacks refer to simultaneous charging towards the opponent and striking with the sword. The technical characteristics have been defined by Park (2005), who stated that the angle of the left elbow is maintained during the backswing motion in a head attack. Furthermore, the balance between the pushing strength of the right arm and the pulling strength of the left arm leads to a successful strike. Lim (2000) stated that the optimal distance between the striker and the opponent for men and kote attacks were 247 cm and 193 cm, respectively, while the strike times were 1.10 sec and 0.64 sec, respectively. To attack effectively, the tip of the sword should not waver and not deviate from the midline of the opponent's body (Min et al., 2001). During the attack motion, the strength is considered to originate from the left leg, although the right leg moves forward towards the opponent (Broderick, Chart, & Ko, 2004). The stride length of the attacker, distance between the attacker and the opponent, and attack time are known to be important factors that determine the results of the attack (Min et al., 2001). Another method of scoring, counter-attack, takes advantage of the instance when the opponent attacks to land a hit (Ogle & O'Donoghue, Korean Journal of Sport Biomechanics 2017; 27(1): 1-7 http://dx.doi.org/10.5103/KJSB.2017.27.1.1 http://e-kjsb.org eISSN 2093-9752 ORIGINAL","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131247124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Validity of a Portable APDM Inertial Sensor System for Stride Time and Stride Length during Treadmill Walking","authors":"G. Tack, Jin-Seung Choi","doi":"10.5103/KJSB.2017.27.1.53","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.53","url":null,"abstract":"Objective: The purpose of this study was to compare the accuracy of stride time and stride length provided by a commercial APDM inertial sensor system (APDM) with the results of three dimensional motion capture system (3D motion) during treadmill walking. Method: Five healthy men participated in this experiment. All subjects walked on the treadmill for 3 minutes at their preferred walking speed. The 3D motion and the APDM were simultaneously used for extracting gait variables such as stride time and stride length. Mean difference and root mean squared (RMS) difference were used to compare the measured gait variables from the two measurement devices. The regression equation derived from the range of motion of the lower limb was also applied to correct the error of stride length. Results: The stride time extracted from the APDM was almost the same as that from the 3D motion (the mean difference and RMS difference were less than 0.0001 sec and 0.0085 sec, respectively). For stride length, mean difference and RMS difference were less than 0.1141 m and 0.1254 m, respectively. However, after correction of the stride length error using the derived regression equation, the mean difference and the RMS difference decreased to 0.0134 m and 0.0556 m or less, respectively. Conclusion: In this study, we confirmed the possibility of using the temporal variables provided from the APDM during treadmill walking. By applying the regression equation derived only from the range of motion provided by the APDM, the error of the spatial variable could be reduced. Although further studies are needed with additional subjects and various walking speeds, these results may provide the basic data necessary for using APDM in treadmill walking.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122408882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Gaze Angle on Muscle Activity and Kinematic Variables during Treadmill Walking","authors":"Bo-Suk Kim, Jae-Hu Jung, W. Chae","doi":"10.5103/KJSB.2017.27.1.35","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.35","url":null,"abstract":"Objective: The purpose of this study was to determine how gaze angle affects muscle activity and kinematic variables during treadmill walking and to offer scientific information for effective and safe treadmill training environment. Method: Ten male subjects who have no musculoskeletal disorder were recruited. Eight pairs of surface electrodes were attached to the right side of the body to monitor the upper trapezius (UT), rectus abdominis (RA), erector spinae (ES), rectus femoris (RF), bicep femoris (BF), tibialis anterior (TA), medialis gastrocnemius (MG), and lateral gastrocnemius (LG). Two digital camcorders were used to obtain 3-D kinematics of the lower extremity. Each subject walked on a treadmill with a TV monitor at three different heights (eye level; EL, 20% above eye level; AE, 20% below eye level; BE) at speed of 5.0 km/h. For each trial being analyzed, five critical instants and four phases were identified from the video recording. For each dependent variable, one-way ANOVA with repeated measures was used to determine whether there were significant differences among three different conditions ( p <.05). When a significant difference was found, post hoc analyses were performed using the contrast procedure. Results: This study found that average and peak IEMG values for EL were generally smaller than the corresponding values for AE and BE but the differences were not statically significant. There were also no significant changes in kinematic variables among three different gaze angles. Conclusion: Based on the results of this study, gaze angle does not affect muscle activity and kinematic variables during treadmill walking. However, it is interesting to note that walking with BE may increase the muscle activity of the trapezius and the lower extremity. Moreover, it may hinder proper dorsiflexion during landing phase. Thus, it seems to reasonable to suggest that inappropriate gaze angle should be avoided in treadmill walking. It is obvious that increased walking speed may cause a significant changes in biomechanical parameters used in this study. It is recommended that future studies be conducted which are similar to the present investigation but using different walking speed.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115912096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between the Ball Velocity and Upper Extremity Kinematic Variables during an Overarm Throwing Task of Inexperienced Individuals","authors":"G. Ozkaya, H. Jung, In Sub Jeong, Min-ra Choi, Min Young Shin, X. Lin, W. Heo, M. S. Kim, Ki-Kwang Lee","doi":"10.5103/KJSB.2017.27.1.19","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.19","url":null,"abstract":"Objective: The aim of this study was to investigate the relationship between the ball velocity and the upper extremity kinematics for both dominant and non-dominant side in inexperienced participants about an overarm throwing task. Method: Seven women who are inexperienced in overarm throwing participated in this study (Age: 25.1 ± 2.4 years, Height: 160.8 ± 3.5; Weight 56.5 ± 7.8). Participants visit the laboratory for three days with one day rest between test sessions. Whole body 3-dimensional (3D) motion capture was recorded during the overarm throwing trials with ten cameras Vicon motion analysis system (T-10, T40, Oxford Metrics Ltd, UK). Total 45 overarm throwing were recorded for each side for each test session. Ball speed also was measured 3 meters away behind the subjects and recorded for every trial. Results: Mean ball velocity was higher for dominant hand compared to non-dominant hand ( p <.05). Trunk segment variables (maximum angles and angular velocities) showed the most consistent relationship with the ball velocity. Conclusion: The importance of the trunk segment during the throwing activities can be seen in some individuals. But inconsistent results between subjects emphasize the importance of the individuals' movement patterns especially for bilateral sports. The future studies should be conduct about the sequence of segments, kinetic variables and effect of training.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"184 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120892914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effects of the Foot Types and Structures of the Inner Arch Support Bands on Ground Reaction Force Variables and Sensations during 2nd Vertical Ballet Jump","authors":"Juhyun Kim, Kyungock Yi","doi":"10.5103/KJSB.2017.27.1.25","DOIUrl":"https://doi.org/10.5103/KJSB.2017.27.1.25","url":null,"abstract":"Objective: The purpose of this research was to establish the differences of ground reaction force variables and sensations according to the foot types and the structures of the inner arch support band during 2 nd vertical ballet jump. Method: 12 Female ballet majors in their twenties who have danced for more than 10 years and had no injuries were selected for this research. Independent variables consist of the foot type (pes rectus, pes planus) and the structure of the inner arch support band (no band, x-shaped, linear shaped). Dependent variables consist of ground reaction force variables and relative wearing sensation. Results: The impact decreased the most when x-shaped bands were used on pes rectus and rigid pes planus. When linear-shaped bands were used on flexible pes planus, the impact decreased. Conclusion: The bands also helped reduce the impact on pes rectus. Furthermore, it is clear that according to the foot type, the impact reducing band structures perform differently. The inner arch support bands were necessary for jump training for any foot type.","PeriodicalId":306685,"journal":{"name":"Korean Journal of Sport Biomechanics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126664428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}