American Journal of Sports Science and Medicine最新文献_第10页

A Canonical Correlation Analysis of Physical Activity Parameters and Body Composition Measures in College Students 大学生身体活动参数与身体成分测量的典型相关分析

American Journal of Sports Science and Medicine Pub Date : 2017-11-27 DOI: 10.12691/AJSSM-5-4-1

P. Hart

{"title":"A Canonical Correlation Analysis of Physical Activity Parameters and Body Composition Measures in College Students","authors":"P. Hart","doi":"10.12691/AJSSM-5-4-1","DOIUrl":"https://doi.org/10.12691/AJSSM-5-4-1","url":null,"abstract":"The aim of this study was to examine the multivariate associate between physical activity (PA) parameters and body composition (BC) measures in college students. A total of N=60 college students who completed a PA questionnaire and had their BC assessed were included in this study. Three variables were used to measure the PA construct: VO2max (ml/kg/min), minutes of moderate PA (MMPA) (min/week), and muscle strengthening activity (MSA) (days/week). Three variables were used to measure the BC construct: percent body fat (PBF) (%), body mass index (BMI) (kg/m2), and waist circumference (WC) (cm). Three different statistical software packages were used to ensure consistent canonical correlation analysis (CCA) findings: SAS, SPSS, and R. Two variates presented useful in the CCA. The first variate showed 77.8% explained variance and a large canonical correlation (rc = .512). The second variate showed 21.8% explained variance and a modest canonical correlation (rc = .301). All communalities (h2s) were large for PA variables. However, h2s were only large for PBF and BMI in the BC construct. Results from this study indicate that PA and BC constructs are correlated with each other in college students. Of particular note, is the contribution of MSA, MMPA, PBF, and BMI to the first variate. As well, the contribution of VO2max, MSA, and BMI to the second variate. These findings may suggest two different relationships between PA and BC: 1) a general PA behavior and BC relationship and 2) an exercise and BC relationship.","PeriodicalId":261831,"journal":{"name":"American Journal of Sports Science and Medicine","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122520510","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

Gender and Age Differences in Toe Muscle Strength in Childhood and the Relationship between Toe Muscle Strength and Basic Motor Skills 儿童足趾肌力的性别、年龄差异及足趾肌力与基本运动技能的关系

American Journal of Sports Science and Medicine Pub Date : 2017-11-24 DOI: 10.12691/AJSSM-5-3-2

Sakiko Ukita, K. Tsuyama

{"title":"Gender and Age Differences in Toe Muscle Strength in Childhood and the Relationship between Toe Muscle Strength and Basic Motor Skills","authors":"Sakiko Ukita, K. Tsuyama","doi":"10.12691/AJSSM-5-3-2","DOIUrl":"https://doi.org/10.12691/AJSSM-5-3-2","url":null,"abstract":"In this study, we examined gender differences and age-related changes in toe muscle strength in childhood as well as the relationship between toe muscle strength and basic motor skills. The subjects included 288 children aged between 6 and 10 years who were enrolled in elementary school. Measurements were conducted for toe muscle strength, long-distance throw, 50 m running time, and standing long jump distance. Toe muscle strength develops with age throughout childhood; no differences were observed in toe muscle strength between girls and boys; however, a significant correlation was observed between toe muscle strength and each of long-distance throw, 50 m running time, and standing long jump distance. There was also a significant partial correlation (eliminating the influence of age) between toe muscle strength and long-throw distance, 50 m running time, and standing long-jump distance for both boys and girls. The results indicate that toe muscle strength tends to develop with age, but there are no gender differences. Results also suggested that toe muscle strength is significantly related to basic motor skills.","PeriodicalId":261831,"journal":{"name":"American Journal of Sports Science and Medicine","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124593069","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

Defining and Monitoring Power Measurement in Elite Swimmers 定义和监测优秀游泳运动员的力量测量

American Journal of Sports Science and Medicine Pub Date : 2017-11-21 DOI: 10.12691/AJSSM-5-3-4

Emma Swanwick

引用次数: 0

Ingestion of Caffeine and Carbohydrate Increases Average Power Output during a 10 mile Time Trial in Both Male and Female Cyclists 摄入咖啡因和碳水化合物增加了男女自行车运动员在10英里计时赛中的平均功率输出

American Journal of Sports Science and Medicine Pub Date : 2017-11-02 DOI: 10.12691/AJSSM-5-3-3

R. Mitchell, Amada Podczerwinski

{"title":"Ingestion of Caffeine and Carbohydrate Increases Average Power Output during a 10 mile Time Trial in Both Male and Female Cyclists","authors":"R. Mitchell, Amada Podczerwinski","doi":"10.12691/AJSSM-5-3-3","DOIUrl":"https://doi.org/10.12691/AJSSM-5-3-3","url":null,"abstract":"Previous researchers observed that elite male cyclists’ performance improves with combined ingestion of caffeine and carbohydrate. We carried out this study to determine if similar outcomes would be observed in a group of cyclists varying widely in age and racing experience as well as gender. We administered carbohydrate with or without the addition of 6 mg/kg body weight caffeine in a counterbalanced blind manner to ten trained male and female cyclists in the fed state one hour prior to 20 minutes of steady-state (SS) cycling at 60% VO2max power followed by a simulated 10-mile time trial (TT). Ventilation (VE), rate of oxygen consumption (VO2), respiratory exchange ratio (RER), and rate of perceived exertion (RPE) were measured during the SS, whereas completion time, average power output, heart rate (HR) and RPE were measured during the TT. The addition of caffeine resulted in a significant reduction in completion time (1.9%) and increased the average power output (5.0%), as well as significantly higher heart rates during the TT (2.9%). We observed no significant differences in VE, VO2, RER, RPE, and HR during the SS between treatments. Our data shows that the ingestion of 6 mg/kg of caffeine in combination with a 7.5% carbohydrate solution in male and female cyclists in the fed state improves short duration time trial performance as measured by completion time and average power output. These findings can be of great value to cyclists across a wide range of age and experience.","PeriodicalId":261831,"journal":{"name":"American Journal of Sports Science and Medicine","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130602346","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

Age-Specific Features of Soccer Players' Heart Dimensions 足球运动员心脏维度的年龄特征

American Journal of Sports Science and Medicine Pub Date : 2017-10-12 DOI: 10.11648/j.ajss.20170505.11

Tiiu Olm, Karin Baskin, K. Herde

引用次数: 0

The Migratory Process and the Volleyball Ranking: First Approaches 迁徙过程与排球排名:初步探讨

American Journal of Sports Science and Medicine Pub Date : 2017-09-22 DOI: 10.11648/J.AJSS.20170504.11

Rafael Marques Garcia, D.F.R Nascimento, Erik Giuseppe Pereira

引用次数: 1

Re-Verification with Regard to Scammon’s Growth Curve Proposal of Fujimmon’s Growth Curve as a Tantative Idea 关于斯卡蒙增长曲线的再验证藤门增长曲线的设想

American Journal of Sports Science and Medicine Pub Date : 2017-08-28 DOI: 10.11648/J.AJSS.20170503.11

K. Fujii

{"title":"Re-Verification with Regard to Scammon’s Growth Curve Proposal of Fujimmon’s Growth Curve as a Tantative Idea","authors":"K. Fujii","doi":"10.11648/J.AJSS.20170503.11","DOIUrl":"https://doi.org/10.11648/J.AJSS.20170503.11","url":null,"abstract":"The Scammon’s growth curve, even during the 80 years since, has been applied to a number of fields. However, one has to wonder if all human characteristics are included in this 4 pattern growth curve classification. Till now, the Scammon’s growth curve has yet to be subjected to scientific verification. In this study, this assessment was verified by applying a cross-correlation function in analyzing changes from collapsing one of the curves to examine their similarity. Because of that, cross correlation function can then be applied to the quantified curve by Wavelet Interpolation Method. The data utilized for analysis, cross-sectional growth data from age one to 20 was used for the four attributes classified by the Scammon growth curve. This data was comprised of brain weight (neural type), thymus (lymphoid type), testicle (genital type), and liver (general type). A cross correlation function is used to show the similarity between two waveforms, and the cross correlation function may be evaluated by convolving one function. In this study, a cross correlation function was assumed from the velocity curve values found from differentiation using the wavelet interpolation model (WIM) for Scammon’s growth types. There are unanticipated possibilities of similarity between brain weight and thymus, and testicle and liver. What can be newly proposed, therefore, is that growth curve types can be classified as neural, lymphoid, and general body types, with the genital type included in the general body type. The genital type, visceral type, and morphological type are included within the general body type.","PeriodicalId":261831,"journal":{"name":"American Journal of Sports Science and Medicine","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117023010","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

Validation of the 15 Minute Balke Field Test for Competitive, Adult 5K Runners: From Treadmill VO 2max Testing to Enhancing Performance 成人5K跑者15分钟Balke场地测试的验证:从跑步机vo2max测试到提高表现

American Journal of Sports Science and Medicine Pub Date : 2017-08-22 DOI: 10.12691/ajssm-5-3-1

R. Mitchell, C. Crandall

{"title":"Validation of the 15 Minute Balke Field Test for Competitive, Adult 5K Runners: From Treadmill VO 2max Testing to Enhancing Performance","authors":"R. Mitchell, C. Crandall","doi":"10.12691/ajssm-5-3-1","DOIUrl":"https://doi.org/10.12691/ajssm-5-3-1","url":null,"abstract":"The purpose of this study was to determine the validity of a 15 minute field test of VO2max in competitive adult male and female 5k runners and analyze the factors that contribute to the VO2max of runners in the field versus on a treadmill. Nineteen trained, endurance runners completed a graded treadmill test and a 15 minute field test on a 400 m track (the Balke field test) to independently determine VO2max. We compared the data using a paired sample t-test, Pearson’s correlation, and multiple linear regression. Treadmill VO2max of runners was significantly higher than the VO2max determined by the 15 minute field test (56.9 +/- 5.3 ml/min/kg vs. 52.7 +/- 4.3 ml/min/kg, t(18) = 6.609, p = 000). We found a strong correlation when both treadmill pace at VO2max and treadmill VO2max were used as predictive factors for field VO2max (r2 = 848, p = .000) with treadmill pace at VO2max having the strongest associative power in the correlation (β = .636, p = 001). The 15 minute field test is an adequate test of 5K race readiness, with the addition of treadmill test giving athletes and coaches an assessment of race fitness relative to aerobic capacity. In addition to treadmill VO2max, coaches and athletes must consider additional performance factors such as treadmill pace at VO2max, lactate threshold, running economy, motivation, etc. for the prediction of field or performance VO2max.","PeriodicalId":261831,"journal":{"name":"American Journal of Sports Science and Medicine","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129745464","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

The Role of Exercise in Hippocratic Medicine 运动在希波克拉底医学中的作用

American Journal of Sports Science and Medicine Pub Date : 2017-08-22 DOI: 10.12691/AJSSM-4-4-6

N. Nomikos, C. Trompoukis, C. Lamprou, G. Nomikos

引用次数: 5

The Effect of External Stimulus Produced by Vibration Stimulus Instrument on Body Sway 振动刺激仪产生的外界刺激对人体摇摆的影响

American Journal of Sports Science and Medicine Pub Date : 2017-08-04 DOI: 10.12691/AJSSM-5-2-4

H. Hirai, S. Demura, T. Kitabayashi, Yoshimasa Matsuura

{"title":"The Effect of External Stimulus Produced by Vibration Stimulus Instrument on Body Sway","authors":"H. Hirai, S. Demura, T. Kitabayashi, Yoshimasa Matsuura","doi":"10.12691/AJSSM-5-2-4","DOIUrl":"https://doi.org/10.12691/AJSSM-5-2-4","url":null,"abstract":"This study aimed to examine the effect of right-left or front-back vibration stimulus during standing on body sway. Subjects were 10 healthy young male adults. They had no evidence or known history of a gait, posture or skeletal disorder. After a weak vibratory stimulus (20 Hz) for 1 min, subjects stood under the strong stimulus (70 Hz) of front-back or right-left vibratory for 1 min. The subjects were measured body sway for 1 min before and after the above vibratory stimulus. Four body-sway factors (unit time sway, front-back sway, left-right sway, and the high frequency band power) were used as evaluation parameters. A significant decrease was found only in a unit time sway factor after vibratory stimulus. A significant difference between front-back and right-left vibratory stimuli was found only in a left-right sway factor and the latter stimulus produced a large change. In conclusion, even in the vibratory stimulus with the same intensity, body sway decreases after front-back stimulus, but increases after right-left stimulus. In short, the effect of vibratory stimulus on posture control system may differ by the vibratory direction.","PeriodicalId":261831,"journal":{"name":"American Journal of Sports Science and Medicine","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128930874","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