Journal of athletic enhancement最新文献_第9页

Muscular and Metabolic Responses to Resistance-Training with Eccentric Overload 肌肉和代谢反应的阻力训练与偏心负荷

Journal of athletic enhancement Pub Date : 2017-02-21 DOI: 10.4172/2324-9080.1000248

B. Ide, Thiago Fern, O. Lourenço, R. Brenzikofer, D. Macedo

{"title":"Muscular and Metabolic Responses to Resistance-Training with Eccentric Overload","authors":"B. Ide, Thiago Fern, O. Lourenço, R. Brenzikofer, D. Macedo","doi":"10.4172/2324-9080.1000248","DOIUrl":"https://doi.org/10.4172/2324-9080.1000248","url":null,"abstract":"Objective: The main aim of the study was to observe the responses to a resistance-training program with an eccentric overload (EO) on muscular and metabolic parameters determinants for endurance training performance. \u0000Methods: Eight physically active subjects (3 women - age: 23.8 ±2.6 years; body mass: 70.9 ± 12.7 kg; height: 1.6 ± 0.08 m; % body fat: 29.6 ± 4.3; and 5 men - age: 23.8 ± 2.6 years; body mass: 75.1 ± 11.2 kg; height: 1.8 ± 0.1 m; % body fat: 20.0 ± 4.9) performed thirteen EO sessions twice a week and 48 hours apart. Maximal strength (MS), strength endurance (SE), and maximal oxygen consumption (VO2) tests were performed prior the beginning of the program, 96 hours Post the last training session (P13), seven and fourteen days afterwards as well (7D, and 14D). \u0000Results: The main findings of this study were MS presented significant (P<0.05) increases at all Post-moments with no significant decrements until 14D. VO2 at respiratory compensation point presented a significant (P<0.05) decrease. Significant (P<0.05) increases in body mass and thigh circumferences were observed from P7 to 14P, with no significant (P<0.05) changes for % of body fat and arms circumferences. \u0000Conclusion: We conclude that the EO program induce a MS increase and maintained until 14 days after training cessation, but the decrease in the VO2 at respiratory compensation point do not support its application to enhance endurance-training performance.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"54 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77310126","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

Associations between Change of Direction, Balance, Speed, and Muscle Power in Prepubescent Soccer Players 青春期前足球运动员方向改变、平衡、速度和肌肉力量之间的关系

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000279

R. Hammami, U. Granacher, F. Pizzolato, Mehdi Chaouachi, M. Chtara, David G. Behm, A. Chaouachi

{"title":"Associations between Change of Direction, Balance, Speed, and Muscle Power in Prepubescent Soccer Players","authors":"R. Hammami, U. Granacher, F. Pizzolato, Mehdi Chaouachi, M. Chtara, David G. Behm, A. Chaouachi","doi":"10.4172/2324-9080.1000279","DOIUrl":"https://doi.org/10.4172/2324-9080.1000279","url":null,"abstract":"Relationships between change of direction (CoD), balance, speed, and power are less extensively studied in youth but provide important information for training. The aim of this study was to determine associations between CoD, balance, speed, and leg power in prepubescent soccer players. Thirty young male soccer players (9.26 ± 0.76 years; Peak-Height-Velocity: -3.42 ± 0.47 years) were assessed for CoD (shuttle run), Y-balance, speed (10-30-m sprint), and muscle power (unilateral, bilateral countermovement jumps [CMJ], unilateral, bilateral standing long jumps [SLJ], and triple hop test). Positive correlations were observed between the shuttle run, and 10-m (r=0.46) and 30-m sprint time (r= 0.47). Negative correlations were found between the shuttle run and SLJ (r=-0.44), bilateral CMJ (r= -0.42), and composite Y-balance (r=−0.49). Linear stepwise regression analysis revealed that 25% of the adjusted variance in the shuttle run test was explained by the Y-balance test (F=9.28; p<0.005). When the 10-m sprint test was added, explained variance amounted to 47% (F=11.87; p<0.001). Medium-sized associations were illustrated between speed, dynamic balance, and CoD in prepubescent soccer players. A greater emphasis on balance and sprint training might be an advantage for youth with less developed neuromuscular capabilities to improve CoD abilities.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"35 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78077867","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: 11

Accuracy and Gaze Behavior of a Closed, Self-Paced Task Performed Under Varied Conditions 在不同条件下执行封闭、自定节奏任务的准确性和凝视行为

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000273

G. Ziv, R. Lidor

引用次数: 1

Who is the GOAT: Jordan, Bryant, or King James? An Inference Based on Data Crunching of the Surface Web 谁是老大:乔丹，科比，还是詹姆斯国王?基于曲面Web数据处理的推理

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000270

A. Al-Imam

{"title":"Who is the GOAT: Jordan, Bryant, or King James? An Inference Based on Data Crunching of the Surface Web","authors":"A. Al-Imam","doi":"10.4172/2324-9080.1000270","DOIUrl":"https://doi.org/10.4172/2324-9080.1000270","url":null,"abstract":"Objectives: Michael Jordan, Kobe Bryant or LeBron James; each one of those top athletes is undoubtedly considered to be the best of his own basketball era. However, many professional athletes and sports critics still do consider Michael Jeffery Jordan to be the greatest basketball player of all time. The purpose of this study derive a statistical inference based on data derived from the surface web in relation to the most popular basketball player, the GOAT. Materials and methods: This study is based on data crunching of; Google Trends database (1) and the surface web (2), literature databases (3), grey literature (4), sports websites (5), in addition to media networks (5). An internet snapshot was taken for the trends database with a subsequent retrospective analysis of data retrieved from the past five years (2012-2017). Results: There was sharp (acute and intermittent) rise in the attentiveness of web users towards each of the three players. However, those were more noticeable for LeBron James. These were correlated with milestone events for each athlete career including; Kobe Bryant final NBA game, and LeBron opting out from his contract with Miami Heat. There was a significant difference in between LeBron’s popularity over both Jordan and Bryant (p-value<0.001). Furthermore, geo-mapping of data revealed that the top countries of highest attentiveness were; the Philippines, Dominican Republic, US, Canada and Hong Kong. Conclusion: For the past half-decade, it seems that the attentiveness of surface web users was more focused towards LeBron James than to either of Kobe Bryant or Michaela Jordan. Accordingly, LeBron is the GOAT since 2012. However, the data analysis did not go back in time prior to 2012, in which it is expected that the relative popularity of the three competitive players might be different.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"190 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83558782","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

Comparison between the Effects of Core Stability Exercise and Manual Therapy in Athletes with Non Specific Mechanical Low Back Pain 核心稳定性训练与手工疗法治疗非特异性机械性腰痛的疗效比较

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000274

B. Dass, K. Zutshi, M. Pp, J. Munjal, SolankyA

{"title":"Comparison between the Effects of Core Stability Exercise and Manual Therapy in Athletes with Non Specific Mechanical Low Back Pain","authors":"B. Dass, K. Zutshi, M. Pp, J. Munjal, SolankyA","doi":"10.4172/2324-9080.1000274","DOIUrl":"https://doi.org/10.4172/2324-9080.1000274","url":null,"abstract":"Objective: To compare between the effects of core stability exercise and manual therapy in athletes with non-specific mechanical low back pain.Short-term pre-test posttest randomized experimental study.Setting: JLN Stadium, SAI, New Delhi.Participants: 30 subjects with non-specific low back pain divided in three groups (n=10) (mean age ± standard deviation, 19.9 ± 2.64, 21.0 ± 3.23, 19.1 ± 2.37 years for control, manual and core group respectively).Intervention: Each of the 30 subjects was randomly assigned into one of three treatment programs for 3 days per week for 5 weeks. Group A was the control group, received hot pack, along with normal warm-up and cool down that the athletes undergo during training session. Group B and C were the experimental group for manual therapy and core stability exercise group respectively. In the experimental group also, the subjects were given hot pack and warm up and cool down common as per their training programmer. Schober’s test, plank test, 30ft shuttle run test, lbp questionnaire and self-confidence questionnaire were the dependent variables and were assessed before and after the intervention.Results: There was statistically improvement in the baseline measures- plank test, 30ft shuttle run test, lbp questionnaire and self-confidence questionnaire- in the manual group.Conclusion: The data signifies that active rehabilitation approach has definitely a positive effect in decreasing the symptoms of nonspecific lbp in athletes. The experimental hypothesis regarding manual therapy being significant was valid due to the significance of values in parameters- 30ft shuttle run, plank test, LBP questionnaire and self-confidence questionnaire. No doubt, the result was more significant in manual group but the difference is not that wide. Yet that’s suggestive of core also has some significant effect but less than manual.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"71 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76724345","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

Collegiate athletes' perceptions of social support and athletic trainer-coach conflict 大学生运动员社会支持感知与教练员冲突

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000277

Nathan D. Newman, W. Weiss

{"title":"Collegiate athletes' perceptions of social support and athletic trainer-coach conflict","authors":"Nathan D. Newman, W. Weiss","doi":"10.4172/2324-9080.1000277","DOIUrl":"https://doi.org/10.4172/2324-9080.1000277","url":null,"abstract":"Abstract Objective: Athletes engage in a cognitive evaluation following an injury to determine if resources are present to manage any potential stress attributed to being injured. This evaluation determines both behavioral and emotional responses to the injury and can be influenced by a number of factors, including social support. Interpersonal conflict could be another factor that influences an injured athlete’s cognitive evaluation. Interpersonal conflict may be present in athletics in the form of athletic trainer-coach conflict. The purpose of this study was to describe the levels of social support and conflict collegiate athletes perceive following an injury, and determine relationships between those perceptions and other variables. Methods: NCAA Division I, II, and III athletes (N=246) from five institutions reported perceptions of social support from their athletic trainer, and the presence of conflict between their athletic trainer and head coach following an injury through a web-based survey. Demographics, such as type of sport, level of competition, and status on the team, were also collected. Results: Athletes perceived athletic trainers as quality sources of social support. Revenue sport athletes perceived higher levels of modeling social support from their athletic trainer when compared to non-revenue athletes (p<0.001). Injured athletes perceived low levels of athletic trainer-coach conflict with no differences based on demographic variables. Additionally, no group differences were found between perceptions of social support or conflict based upon the athlete’s status on the team or level of competition. Conclusions: These results indicate that athlete’s perceptions of social support from athletic trainers, may vary depending on the type of sport in which they participate. Understanding variables that influence how an athlete perceives support from their athletic trainer could improve rehabilitation outcomes by way of influencing the cognitive appraisal injured athletes make leading to both positive behavioral and cognitive actions.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"16 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72546320","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

Effects of Color on the Athletic Performance of Short-Distance Runners 颜色对短跑运动员运动成绩的影响

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000276

Takako Fujii, H. Nakano, Masaki Wakita, E. Maeshima

引用次数: 1

Opponens Pollicis Long Latency Reflex during the Ipsilateral Sustained Knee Torque Maintenance 对手政策长潜伏期反射在同侧持续膝关节扭矩维持中的作用

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000271

S. Daikuya, Yumi Okayama, K. Yabe

{"title":"Opponens Pollicis Long Latency Reflex during the Ipsilateral Sustained Knee Torque Maintenance","authors":"S. Daikuya, Yumi Okayama, K. Yabe","doi":"10.4172/2324-9080.1000271","DOIUrl":"https://doi.org/10.4172/2324-9080.1000271","url":null,"abstract":"Objective: As a preliminary study to clarify the excitability of central nervous system function during motor control, the aspect of long latency reflex in the upper limbs, which is an indicator of excitability of upper central nervous system function, while maintaining knee extension torque with constant strength. Methods: Long latency reflex was recorded from opponens pollicis muscle during the ipsilateral sustained torque demonstration of the knee extension by different feedback methods in healthy subjects with maintaining the 25% of individual peak torque by the visual feedback and the verbal instruction. From the acquired waveform, the appearance characteristic of long latency reflex between each task was visually examined. Results: In 8 out of 10 subjects, the aspect of the long latency reflex was changed according to the difference in task. Discussion and conclusion: It was suggested that excitability of higher level of cortex might be enhanced if the degree of difficulty becomes higher even if motion control of lower limbs. In the requirement of fine adjustment of motor control, even if the task of lower extremity, it was suggested that the excitability of the cerebral cortex function associated with the upper limb might increase. Because it is not possible to refer to the individual difficulty level of tasks and the skill of lower limbs for each subject in this experiment, follow-up study is needed under the clear conditions of the task, especially individual difficulty and skill.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"53 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80169067","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 Pilot Comparison of the Hang Clean and Hang Snatch to the Clean Pull and Snatch Pull 悬空挺举和悬空抓举与挺举和抓举的初步比较

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000269

C. Ers, T. Sevene, Adams Kj, M. DeBeliso

{"title":"A Pilot Comparison of the Hang Clean and Hang Snatch to the Clean Pull and Snatch Pull","authors":"C. Ers, T. Sevene, Adams Kj, M. DeBeliso","doi":"10.4172/2324-9080.1000269","DOIUrl":"https://doi.org/10.4172/2324-9080.1000269","url":null,"abstract":"Development of lower body strength and power is a primary goal of athletic-based strength and conditioning programs. Weightlifting and weightlifting derivatives are key components of these programs. 1.1 Objectives: This pilot study compared two variations of weightlifting derivatives on lower body strength and power in female athletes. 1.2 Methods: Athletes (n=21, 19-21 years) were randomly assigned to either the Hang Group-HG (n=11) or the Pull Group-PG (n=10). Weightlifting training took place for 6 weeks focusing on the hang clean and hang snatch with catch, and the clean pull and snatch pull without catch; supplemental resistance exercises were identical between the groups. HG performed hang cleans for weeks 1-3, before transitioning over to hang snatches for weeks 4-6. PG performed clean pulls for weeks 1-3, before transitioning over to snatch pulls for weeks 4-6. The same set, repetition, and loading scheme were used for both groups. Testing was conducted for 1RM box squat (BS), vertical jump (VJ), and standing broad jump (BJ). 1.3 Results: 14 participants completed the study (HG, n=9; PG n=5). Both groups significantly improved 1RM BS scores (HG: 15.8%, PG: 15.5%) and VJ (HG: 12.1%, PG: 16.1%) (p 0.05). There was no significant difference in gain scores between groups for VJ or 1RM box squat. 1.4 Conclusion: Within the parameters of this study, the hang clean and hang snatch with catch, and the clean pull and snatch pull without catch, have similar effects on lower body strength and power. Practitioners may consider these weightlifting derivatives interchangeable choices to increase both lower body strength and power. However, the lack of a catch may be advantageous in terms of reduced joint stress to the athlete and improved time efficiency during teaching and training.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"2017 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89119037","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

Dynamic Warm-up Duration Does Not Influence Vertical Jump Performance 动态热身持续时间不会影响垂直跳跃的表现

Journal of athletic enhancement Pub Date : 2017-01-01 DOI: 10.4172/2324-9080.1000278

G. Stuart, Marino Js, T. Hubbard-Turner, Thomas Ac

{"title":"Dynamic Warm-up Duration Does Not Influence Vertical Jump Performance","authors":"G. Stuart, Marino Js, T. Hubbard-Turner, Thomas Ac","doi":"10.4172/2324-9080.1000278","DOIUrl":"https://doi.org/10.4172/2324-9080.1000278","url":null,"abstract":"Warm-up prepares the body for activity and minimizes injury risk while not hindering performance. However, the optimal parameters for a warm-up have yet to be defined. This study sought to determine how dynamic warm-up duration (5 vs. 10 minutes) influences vertical jump height and muscle strength. Twelve healthy adults (n=6 female, age: 21.5 ± 3.4 years; height:1.6 ± 0.1 m, mass: 58.2 ± 10.4 kg; n=6 male, age: 23.0 ± 0.9 years, height: 1.8 ± 0.1 m, mass: 91.0 ± 13.4 kg) completed 3 sessions: baseline and the dynamic warmups, each separated by 1 week. Warm-up order was randomized. Baseline and post-warm-up testing included vertical jump and quadriceps and hamstrings strength (normalized to body mass) assessment. The short warm-up consisted of dynamic stretches and a plyometric circuit performed for 5-minutes. The long warmup was identical to the short, except it was performed for 10-minutes. Heart rate and rating of perceived exertion were recorded before and after each warm-up. Repeated measures ANCOVAs with sex as a covariate determined differences in vertical jump and normalized muscle strength over time. Heart rate was analyzed using repeated measures ANOVAs and Wilcoxon signed ranks tests examined changes in rating of perceived exertion over time. Males jumped higher than females (P<0.001); however, vertical jump height did not differ between protocols (P=0.082). Males had stronger quadriceps than females at baseline (P=0.017) but not following the short (P=0.091) or long (P=0.729) protocols. Quadriceps strength was greater at baseline (P<0.001) while hamstrings was lower (P=0.004). Heart rate (P<0.001) and rating of perceived exertion (P=0.002) were greater following both warm-ups compared to baseline. Warm-up did not improve vertical jump performance. Quadriceps strength did begin to decline; therefore, care should be taken when designing a dynamic warm-up in order not to impair subsequent activity performance.","PeriodicalId":90574,"journal":{"name":"Journal of athletic enhancement","volume":"20 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78608544","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