International Journal of Kinesiology and Sports Science最新文献_第9页

A Comparison of Inertial Motion Capture Systems: DorsaVi and Xsens 惯性运动捕捉系统的比较:DorsaVi和Xsens

International Journal of Kinesiology and Sports Science Pub Date : 2020-07-31 DOI: 10.7575/aiac.ijkss.v.8n.3p.24

Alisa Drapeaux, K. Carlson

{"title":"A Comparison of Inertial Motion Capture Systems: DorsaVi and Xsens","authors":"Alisa Drapeaux, K. Carlson","doi":"10.7575/aiac.ijkss.v.8n.3p.24","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.24","url":null,"abstract":"Background: dorsaVi Professional Suite, founded in 2018, is a 3D wearable sensor technology system that monitors the kinematic data of the lower extremity and lumbar spine. The dorsaVi system is used in the clinical setting to assist with clinical rehabilitation and preventive measures. Objective: The purpose of this study was to compare the inertial motion capture systems: the dorsaVi Professional Suite and Xsens to determine validity and reliability. Methods: This study utilized nine participants (7 female, 2 male) with data collected on two separate sessions. Each subject performed 15 repetitions each of double leg squats, left single leg squat, and right single leg squat during session one and then repeated the same testing procedure 7-10 days later. Kinematic variables measured were tibial inclination, knee varus, and knee valgus. Pearson product moment correlation coefficients were used to demonstrate the relationship within and between the motion capture systems across the knee positions and squat trials. Results: Within system reliability measurements demonstrated strong correlations (r>0.90) of the lower extremity kinematic data between testing sessions. Between system validity measurements also demonstrated strong correlations (r>0.90) across all lower extremity movements. Conclusions: The dorsaVi Professional Suite knee module kinematic data showed strong correlations to the validated motion capture system (Xsens). Thus, a clinician should be confident in using the dorsaVi in the evaluation, diagnosis, and treatment of patients.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"24-27"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46788245","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}

引用次数: 7

Head, Neck, Trunk, and Pelvis Tissue Mass Predictions for Older Adults using Anthropometric Measures and Dual-Energy X-Ray Absorptiometry 使用人体测量和双能X射线吸收法预测老年人的头、颈、躯干和骨盆组织质量

International Journal of Kinesiology and Sports Science Pub Date : 2020-07-31 DOI: 10.7575/aiac.ijkss.v.8n.3p.14

Charles Kahelin, Nicole C. George, Danielle L. Gyemi, D. Andrews

{"title":"Head, Neck, Trunk, and Pelvis Tissue Mass Predictions for Older Adults using Anthropometric Measures and Dual-Energy X-Ray Absorptiometry","authors":"Charles Kahelin, Nicole C. George, Danielle L. Gyemi, D. Andrews","doi":"10.7575/aiac.ijkss.v.8n.3p.14","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.14","url":null,"abstract":"Background: Regression equations using anthropometric measurements to predict soft (fat mass [FM], lean mass [LM], wobbling mass [WM]) and rigid (bone mineral content [BMC]) tissue masses of the extremities and core body segments have been developed for younger adults (16-35 years), but not older adults (36-65 years). Tissue mass estimates such as these would facilitate biomechanical modeling and analyses of older adults following fall or collision-related impacts that might occur during sport and recreational activities. Purpose: The purpose of this study was to expand on the previously established tissue mass prediction equations of the head, neck, trunk, and pelvis for healthy, younger adults by generating a comparable set of equations for an older adult population. Methods: A generation sample (38 males, 38 females) was used to create head, neck, trunk, and pelvis tissue mass prediction equations via multiple linear stepwise regression. A validation sample (13 males, 12 females) was used to assess equation accuracy; actual tissue masses were acquired from manually segmented full body Dual-Energy X-ray Absorptiometry scans. Results: Adjusted R2 values for the prediction equations ranged from 0.326 to 0.949, where BMC equations showed the lowest explained variances overall. Mean relative errors between actual and predicted masses ranged from –2.6% to 6.1% for trunk LM and FM, respectively. All actual tissue masses except head BMC (R2 = 0.092) were significantly correlated to those predicted from the equations (R2 = 0.403 to 0.963). Conclusion: This research provides a simple and effective method for predicting head, neck, trunk, and pelvis tissue masses in older adults that can be incorporated into biomechanical models for analyzing sport and recreational activities. Future work with this population should aim to improve core segment BMC predictions and develop equations for the extremities.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"14-23"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47773600","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}

引用次数: 1

High-Intensity Interval Training in Middle-Distance NCAA Division I 800/1500m Collegiate Athletes 中距离NCAA I组800/1500米大学生运动员的高强度间歇训练

International Journal of Kinesiology and Sports Science Pub Date : 2020-07-31 DOI: 10.7575/aiac.ijkss.v.8n.3p.28

Ffion G. Price, JohnEric W Smith, Alana Turner, Ben M Krings, Hunter S. Waldman, H. Chander, A. Knight, M. McAllister

{"title":"High-Intensity Interval Training in Middle-Distance NCAA Division I 800/1500m Collegiate Athletes","authors":"Ffion G. Price, JohnEric W Smith, Alana Turner, Ben M Krings, Hunter S. Waldman, H. Chander, A. Knight, M. McAllister","doi":"10.7575/aiac.ijkss.v.8n.3p.28","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.28","url":null,"abstract":"Background: High-intensity interval training (HIIT) has grown in popularity, with studies demonstrating improvements in aerobic and anaerobic performances within Sedentary and Recreationally active adults. Little research has been comprised on collegiate, middle-distance runners (800m/1500m). Objective: This research study aimed to investigate the impact of four-weeks HIIT cycling training on collegiate 800/1500m runners performance, and determine whether HIIT can be used as an alternative training method for student athletes. Methods: Twelve middle-distance runners were recruited, with six athletes completing the intervention. Athletes completed pre-testing, which included a 1500m time trial, a GXT, stride length and frequency measurements, and MVIC, using Biopac electromyography (EMG). After pre-testing, athletes completed four weeks of HIIT twice per week. The HIIT consisted of four 20-second bouts with 4 minutes recovery. Following the completion of the training intervention, post-testing was performed for all measures. A paired t-test was used to determine differences between pre- and post-performance tests. An ANOVA was used to determine changes in heart rate and RPE during the GXT. Results: Significant changes were demonstrated between the pre- and post-muscle activation tests of the quadriceps (p=0.05). Significant changes were seen with both HR (p<0.05) and RPE (p<0.05) throughout the GXT. No other significant differences were demonstrated between pre- and post-performance tests, concluding four-weeks HIIT does not alter 800/1500m performance. Conclusion: From the results of this study, HIIT could be used as an alternate method for training for 800/1500m runners. Further reasearch should be conducted toto further understand the impacts of HIIT on middle distance athletes.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"28-35"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71368191","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}

引用次数: 1

A Multi-factorial Analysis of Elementary Students’ Interest in Physical Education Considering Students’ Ethnicity and Gender 考虑种族和性别的小学生体育兴趣的多因素分析

International Journal of Kinesiology and Sports Science Pub Date : 2020-05-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.7

John Hatten, J. Hannon

{"title":"A Multi-factorial Analysis of Elementary Students’ Interest in Physical Education Considering Students’ Ethnicity and Gender","authors":"John Hatten, J. Hannon","doi":"10.7575//aiac.ijkss.v.8n.2p.7","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.7","url":null,"abstract":"Background: Student’s harboring positive interest in physical education is of great concerning in academia. More importantly, the rational as to why one would maintain a positive interest in physical education is of concern. These topics have been widely researched. However, the comparison of gender and ethnicity as it relates to students’ interest in physical education is a novel investigation. Objective: The purpose of this study was to ascertain the relationship between elementary student’s interest in physical education considering gender, ethnicity, curricular and teacher influences, and student’s perceived competency. Method: Participants included 99 fifth-grade elementary school students (62 males, 37 females). Participant selection was conducted by utilizing 6 intact physical education classes from a single culturally diverse elementary school. The Physical Education Interest Questionnaire was the instrument used for this study as well as open-ended questions for the purpose of qualitative analysis (Van Wersch, Trew, & Turner, 1992). Results: Findings, indicated that students, regardless of ethnicity and gender, maintained positive interest in physical education. However, male students maintained greater interest in physical education than female students, irrespective of ethnicity. Caucasian students maintained significantly higher interest than other ethnicities. Perceived competence had the most effect on students’ overall interest. Answers to open-ended questions supported these results. Conclusion: Although this study identified that a positive interest in physical education regardless of the subjects’ gender and ethnicity existed, it is imperative that future instructors consider teaching non-mainstream individual fitness activities to students. This would lead to increased individual perceived competency and continued positive interest in physical education.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"7-16"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42119474","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}

引用次数: 0

Jumping Performance of Elite NCAA Division 1 Student-athletes: The Effect of Basketball Shoe Design – Part I NCAA第一赛区优秀学生运动员的跳跃表现：篮球鞋设计的影响——上

International Journal of Kinesiology and Sports Science Pub Date : 2020-05-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.17

Tony Luczak, Reuben F. Burch, Brian K. Smith, J. Lamberth, Daniel W. Carruth

{"title":"Jumping Performance of Elite NCAA Division 1 Student-athletes: The Effect of Basketball Shoe Design – Part I","authors":"Tony Luczak, Reuben F. Burch, Brian K. Smith, J. Lamberth, Daniel W. Carruth","doi":"10.7575//aiac.ijkss.v.8n.2p.17","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.17","url":null,"abstract":"Background: Assessment of basketball shoes as personal protection equipment (PPE) at the collegiate level is unique. Objective: The purpose of Part I in this pilot study was to examine the effect of shoe design on jump height in elite male and female National Collegiate Athletic Association (NCAA) Division 1 basketball student-athletes. Method: Each team selected two pairs of AdidasTM branded shoes. The male student-athletes selected the AdidasTM Harden Vol. 3 and the AdidasTM SM Pro basketball shoes. The female student-athletes selected the AdidasTM Harden Vol. 3 and the AdidasTM Captain Marvel basketball shoes. A total of sixteen basketball student-athletes (six males, ten females) performed an acute series of four styled basketball jumps on two ForceDecksTM Force Platforms while trying to maximize jump height by tapping VertecTM Jump Vanes. Two trials were performed in each shoe and for each type of jump which included a countermovement jump, drop jump from 30cm, step and jump, and a series of plyometric jumps. Results: The results of this pilot study indicated a non-significant effect of basketball shoe design on jump height while performing an acute series of basketball style jumps for either the male or female basketball student-athletes. However, there were significant differences in jump height and peak power between the male and female basketball student-athletes (p = 0.001). Conclusion: In addition to the results, the use of quantitative performance testing on the effectiveness of basketball shoe designs as PPE may assist in the mitigation of non-contact ankle and lower limb injuries.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"17-25"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46476658","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}

引用次数: 3

Difference in Internal and External Workloads between Non-Injured and Injured Groups in Collegiate Female Soccer Players 大学女子足球运动员非伤病组内外负荷的差异

International Journal of Kinesiology and Sports Science Pub Date : 2020-05-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.26

Ai Ishida, Joshua S. Beaumont

{"title":"Difference in Internal and External Workloads between Non-Injured and Injured Groups in Collegiate Female Soccer Players","authors":"Ai Ishida, Joshua S. Beaumont","doi":"10.7575//aiac.ijkss.v.8n.2p.26","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.26","url":null,"abstract":"Background: Effects of internal and external workloads (IL, EL) on lower limb soft-tissue injuries (LLSTI) risk in male soccer players has been described, the relationships remain unclear in collegiate female (soccer players. Objective: The purpose was to examine the mean difference in IL and EL in LLSTI between non-injured and injured groups (N-IG and IG). Method: 20 collegiate female soccer players (age: 19.2±1.2years; height: 168.2±7.3cm; body mass: 41.0±17.9kg) were included for 14 week competitive season. IL included average heart rate (Avg-HR) and high heart rate zone. EL included total distance, average speed (Avg-Spd), and high-speed running distance. Injuries were counted if (a) they were LLSTI and muscular/ligamentous strains or tears and tendon problems, and (b) the players missed more than one match or training session. Acute (7-day simple average) and chronic (21-day simple average) IL and EL were calculated in the IG while the mean of acute (7-day) and chronic (21-day) IL and EL were computed in the NIG. Acute Chronic Workload Ratio (ACWR) was calculated as the ratio of acute and chronic IL and EL. Results: Seven LLSTI occurred over 14 weeks. The acute Avg-HR and ACWR of Avg-Spd were significantly higher in the IG than the N-IG (p=0.001 and 0.024). IL and EL in the IG were placed below or above the mean of the N-IG. Conclusion: LLSTI might occur at high and low workloads in collegiate female soccer players. This may support the use of micro-technology to monitor workload based on individual player’s threshold to reduce LLSTI.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"26-32"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49365987","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}

引用次数: 2

Changes in Heart Rate Variability and Post Exercise Blood Pressure from Manipulating Load Intensities of Resistance-Training 通过控制阻力训练负荷强度对心率变异性和运动后血压的影响

International Journal of Kinesiology and Sports Science Pub Date : 2020-05-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.40

B. Alemi, Lianyee Kok, H. Ler, C. Chee

{"title":"Changes in Heart Rate Variability and Post Exercise Blood Pressure from Manipulating Load Intensities of Resistance-Training","authors":"B. Alemi, Lianyee Kok, H. Ler, C. Chee","doi":"10.7575//aiac.ijkss.v.8n.2p.40","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.40","url":null,"abstract":"Background: The isolated effect of resistance training (RT) on heart rate variability (HRV) and blood pressure (BP) is crucial when prescribing suitable training programmes for healthy individuals. Objective: The purpose of this study was to compare BP and HRV responses in physically active men after an acute RT session with loads of 5-, 10- or 15-repetition maximums (5RM, 10RM and 15RM). Method: Eighty-one men (age: 21.6±1.1yr; body mass: 74.1±5.8 kg; height: 175.3 ±7.1cm) who performed moderate to vigorous physical activities for at least 30 min a day on most days of the week participated in this study. After the of 5RM loads for the bent-over row (BR), bench press (BEP), Dead-lift (DL) and squats (SQ), participants were divided into three training load groups (15RM = GrpL, 10RM = GrpM or 5RM = GrpH). During the experimental session, each group (n=27) performed 3 sets for each of the four exercise, with 2-min rest intervals between sets and exercises with their assigned training load. BP and HRV were measured prior to, immediately after, and at 15-min intervals until two hours post-experiment. Results: All three groups attained improved BP (p = .001) reductions and longer HRV (p = .0001) changes after an acute exercise session but the GrpM (10RM) and and GrpL (15RM) performed better than GrpH (5RM). Conclusion: Strength and conditioning professionals may prescribe exercises with 10-15RM loads if the aim is to obtain an acute reduction in BP after an RT session.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"40-46"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48425318","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}

引用次数: 3

Using K-means Clustering to Create Training Groups for Elite American Football Student-athletes Based on Game Demands 基于比赛需求的k -均值聚类方法构建优秀美式橄榄球学生运动员训练组

International Journal of Kinesiology and Sports Science Pub Date : 2020-05-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.47

Zachary Shelly, Reuben F. Burch, Wenmeng Tian, Lesley J. Strawderman, A. Piroli, Corey Bichey

{"title":"Using K-means Clustering to Create Training Groups for Elite American Football Student-athletes Based on Game Demands","authors":"Zachary Shelly, Reuben F. Burch, Wenmeng Tian, Lesley J. Strawderman, A. Piroli, Corey Bichey","doi":"10.7575//aiac.ijkss.v.8n.2p.47","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.47","url":null,"abstract":"Background: American football and the athletes that participate have continually evolved since the sport’s inception. The fluidity of the sport, as well as the growth of the body of knowledge pertaining to American football, requires evolving training techniques. While performance data is being garnered at very high rates by elite level sports organizations, the limiting factor to the value of data can be the limited known uses for the data. Objective: This study introduces a technique that can be used in tandem with data collected from wearable technology to better inform training decisions. Method: The K-means clustering technique was used to group athletes from two seasons worth of data from an NCAA Division 1 American football team that is in the “Power 5.” The data was obtained using Catapult Sports OPTIMEYE S5 TM in games played against only other “Power 5” programs. This data was then used to create average game demands of each student-athlete, which was then used to create training groups based upon individual game demands as previously mentioned. Results: The resultant groupings from the single-season analyses of seasons one and two showed results that were similar to traditional groupings used for training in American football, which worked as validation of the results, while also offering insights on individuals that may need to consider training in a non-traditional group based upon their game demands. Conclusion: This technique can be brought to `athletic training and be useful in any organization that is dealing with training multitudes of athletes.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"47-63"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44257502","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}

引用次数: 14

Assessment of Post-Rehabilitation ACL Reconstructed Knees 康复后ACL重建膝关节的评估

International Journal of Kinesiology and Sports Science Pub Date : 2020-05-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.33

K. Carlson

{"title":"Assessment of Post-Rehabilitation ACL Reconstructed Knees","authors":"K. Carlson","doi":"10.7575//aiac.ijkss.v.8n.2p.33","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.33","url":null,"abstract":"Background: Understanding objective measures of ACL-reconstructed knee function is important in determining the efficacy of rehabilitation protocols and a patient’s return to activities of daily living and sport activities. Objective: To assess the range of motion (ROM), isokinetic strength (torque) and functional performance measures (hop test) of ACL-reconstructed and ACL-intact knees. Methods: Twelve volunteers (5 females, 7 males) with unilateral ACL injury and reconstruction were given a battery of tests (hop test for distance, knee range of motion, knee extensor isokinetic testing to assess both affected and unaffected lower limb function, flexibility and strength. Main effects and interactions were analyzed by mixed-model repeated measures ANCOVA. Dependent variables included hop test for distance, knee flexion and extension range of motion, and knee extensor isokinetic torque. The independent variables were the intact/reconstructed ACL knee and time from surgery. Sex was the covariate. Results: No statistically significant differences (p>0.05) were found across all dependent variables hop test for distance (P = 0.939), knee flexion (P = 0.576) and extension (P = 0.431) ROM, and knee extensor torque (eccentric P = 0.923 and concentric P = 0.723) for the main effects and interactions of knee (ACL-reconstructed and ACL-intact) and time (0-12 months, 13-24 months, 25-36 months and 37+ months). The covariate, sex, did produce significant differences for the hop test (P < 0.0001) and isokinetic testing (eccentric peak torque P = 0.003 and concentric peak torque P=0.012). Conclusions: Clinicians may consider present rehabilitation protocols to be adequate in developing ROM and isokinetic strength following ACL reconstruction. However, greater improvements in ROM and strength may be achieved over an extended period following ACL reconstruction surgery.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":"8 1","pages":"33-39"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49084176","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}

引用次数: 2

Examining Changes in Bat Swing Kinematics in Different Areas of the Strike Zone in Collegiate Baseball Players 高校棒球运动员击球区不同区域挥棒运动学变化的研究

International Journal of Kinesiology and Sports Science Pub Date : 2020-04-01 DOI: 10.7575//aiac.ijkss.v.8n.2p.1

Charles C. Williams, Paul T. Donahue, Samuel J Wilson, J. Mouser, C. Hill, Lauren A. Luginsland, J. Gdovin, Chip Wade, John C. Garner

{"title":"Examining Changes in Bat Swing Kinematics in Different Areas of the Strike Zone in Collegiate Baseball Players","authors":"Charles C. Williams, Paul T. Donahue, Samuel J Wilson, J. Mouser, C. Hill, Lauren A. Luginsland, J. Gdovin, Chip Wade, John C. Garner","doi":"10.7575//aiac.ijkss.v.8n.2p.1","DOIUrl":"https://doi.org/10.7575//aiac.ijkss.v.8n.2p.1","url":null,"abstract":"Background: According to the National Collegiate Athletic Association (NCAA) there are over 34,000 athletes who compete in baseball at the collegiate level. These individuals spend countless hours training to improve their ability at bat performance by use of a batting tee and their position preference. However, during a game situation an athlete may swing a bat through their strike zone depending on the pitch thrown by an opposing pitcher. Objective: The aim of this investigation was to examine changes in swing kinematics throughout an individual’s strike zone in collegiate baseball players. Variables of interest included resultant velocity at ball contact (RVBC) and the angle of the bat at ball contact (BABC). Methodology: A series of markers were placed on the tee and bat to record swing kinematic variables of interest. Participants completed a brief two-minute on-deck warm-up protocol before being counterbalanced into completing 15 swing trials in various regions of their respective strike zone. A ten-minute washout period was completed followed by another 15 swing trials throughout their strike zone until there was a total of 45 swing trials, having 5 swing trials completed in each of the nine regions of the strike zone. Results: Repeated measures analysis of variance were used to examine swing kinematic variables of interest. Significant differences were found in RVBC along with significant differences in BABC (p<.05). Conclusions: Knowledge of this information can allow both athlete and sport coach to identify areas of weakness when addressing their hitting performance in preparation for an at bat situation during a game.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48334195","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}

引用次数: 2