Sports medicine international open最新文献_第7页

Changes in Flexibility and Force are not Different after Static Versus Dynamic Stretching 静态拉伸和动态拉伸后柔韧性和力的变化没有什么不同

Sports medicine international open Pub Date : 2019-10-23 DOI: 10.1055/a-1001-1993

Shingo Matsuo, M. Iwata, M. Miyazaki, Taizan Fukaya, Eiji Yamanaka, K. Nagata, Wakako Tsuchida, Y. Asai, Shigeyuki Suzuki

{"title":"Changes in Flexibility and Force are not Different after Static Versus Dynamic Stretching","authors":"Shingo Matsuo, M. Iwata, M. Miyazaki, Taizan Fukaya, Eiji Yamanaka, K. Nagata, Wakako Tsuchida, Y. Asai, Shigeyuki Suzuki","doi":"10.1055/a-1001-1993","DOIUrl":"https://doi.org/10.1055/a-1001-1993","url":null,"abstract":"Abstract In this study, we examined the effects of static and dynamic stretching on range of motion (ROM), passive torque (PT) at pain onset, passive stiffness, and isometric muscle force. We conducted a randomized crossover trial in which 16 healthy young men performed a total of 300 s of active static or dynamic stretching of the right knee flexors on two separate days in random order. To assess the effects of stretching, we measured the ROM, PT at pain onset, passive stiffness during passive knee extension, and maximum voluntary isometric knee flexion force using an isokinetic dynamometer immediately before and after stretching. Both static and dynamic stretching significantly increased the ROM and PT at pain onset (p<0.01) and significantly decreased the passive stiffness and isometric knee flexion force immediately after stretching (p<0.01). However, the magnitude of change did not differ between the two stretching methods for any measurements. Our results suggest that 300 s of either static or dynamic stretching can increase flexibility and decrease isometric muscle force; however, the effects of stretching do not appear to differ between the two stretching methods.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E89 - E95"},"PeriodicalIF":0.0,"publicationDate":"2019-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-1001-1993","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49032517","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

Match Running Performance on Three Different Competitive Standards in Norwegian Soccer 挪威足球三种竞技标准下的比赛跑动表现

Sports medicine international open Pub Date : 2019-10-16 DOI: 10.1055/a-0943-3682

A. Sæterbakken, Vebjorn Haug, D. Fransson, Halvard Grendstad, Hilde Gundersen, V. F. Moe, Einar Ylvisåker, M. Shaw, A. Riiser, V. Andersen

{"title":"Match Running Performance on Three Different Competitive Standards in Norwegian Soccer","authors":"A. Sæterbakken, Vebjorn Haug, D. Fransson, Halvard Grendstad, Hilde Gundersen, V. F. Moe, Einar Ylvisåker, M. Shaw, A. Riiser, V. Andersen","doi":"10.1055/a-0943-3682","DOIUrl":"https://doi.org/10.1055/a-0943-3682","url":null,"abstract":"Abstract The aim of the study was to compare running performance of three competitive standards and to examine the effects of being promoted to a higher league in Norwegian football. One clubʼs first and second team were included. The first team consisted of professional soccer players playing at Level 2 (2015 season) and Level 1 (2016 season). The second team consisted of amateurs playing at Level 4. A fully automatic tracking system was used to examine running performance, divided into different running-speed categories and playing position. Forty-one matches were included containing 278 observations. Level 1 performed 61 and 51% sprinting compared to Level 2 and Level 4 but similar high-speed running. Similar high-speed running distances were observed only for the different playing positions at Level 1 compared to Level 2 and 4. The sprinting distance was greater for the central defender and attacker, and the number of accelerations was greater for central midfielders and wide midfielders’ playing at Level 1 compared to lower competitive standards. In conclusion, better competitive standards resulted in greater high-intensity actions than lower leagues in Norwegian soccer. Furthermore, only central defenders and attackers increased their high-intensity locomotions when the team was promoted.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E82 - E88"},"PeriodicalIF":0.0,"publicationDate":"2019-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-0943-3682","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49230545","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: 20

Comparison of Kinematics and Muscle Activation between Push-up and Bench Press 俯卧撑和卧推运动和肌肉激活的比较

Sports medicine international open Pub Date : 2019-09-05 DOI: 10.1055/a-1001-2526

R. Tillaar

{"title":"Comparison of Kinematics and Muscle Activation between Push-up and Bench Press","authors":"R. Tillaar","doi":"10.1055/a-1001-2526","DOIUrl":"https://doi.org/10.1055/a-1001-2526","url":null,"abstract":"Abstract The purpose of this study was to compare the similarity in kinematics and upper-body muscle activation between push-up and bench press exercises over a range of loads. Twenty resistance-trained subjects (age 22.5±5.24 yrs, body mass 83.7±10.7 kg, height 1.80±0.06 m) executed bench presses and push-ups with 4 different loads. Bench press was executed at 50–80% of their assumed 1 repetition max in steps of 10 kg, while push-ups were executed without a weight vest and with a 10–20–30 kg weight vest. A linear encoder measured kinematics (displacement, time, average and peak velocity) during the exercises at each load, together with mean and maximal muscle activation of 8 upper body muscles and their timing for each exercise and each load. The main findings of this study demonstrate no differences in kinematics and muscle activation between the two exercises and that the different loads had the same effect upon both push-up and bench press in experienced resistance-trained men. For coaches and athletes, push-ups and bench presses for strength training can be used interchangeably. By using a weight vest, push-ups can mimic different loads that are similar to different intensities in the bench press that can be used to train strength demands.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E74 - E81"},"PeriodicalIF":0.0,"publicationDate":"2019-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-1001-2526","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46176685","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: 10

Letter to the Editor: Is Golf the New Football or Have We Made It So? 致编辑的信:高尔夫是新的足球还是我们创造的?

Sports medicine international open Pub Date : 2019-08-21 DOI: 10.1055/a-0985-0449

Harsh Deora, Nishant S. Yagnick, M. Tripathi, S. Mohindra

引用次数: 2

Determination of the Maximal Lactate Steady State by HRV in Overweight and Obese Subjects HRV测定超重和肥胖受试者的最大乳酸稳态

Sports medicine international open Pub Date : 2019-07-15 DOI: 10.1055/a-0883-5473

T. Schmidt, Sarah Wulff, K. Braumann, R. Reer

{"title":"Determination of the Maximal Lactate Steady State by HRV in Overweight and Obese Subjects","authors":"T. Schmidt, Sarah Wulff, K. Braumann, R. Reer","doi":"10.1055/a-0883-5473","DOIUrl":"https://doi.org/10.1055/a-0883-5473","url":null,"abstract":"Abstract The study assessed if the maximal lactate steady state (MLSS) may be determined by HRV in overweight and obese individuals. Fourteen obese (OB) and 14 overweight (OW) participants performed an incremental exercise test and several constant-load tests on a bicycle ergometer to determine the MLSS. HRV was analysed by using time domain and non-linear parameters of the Poincaré plot. Various HRV thresholds (HRVt) were detected and compared with the MLSS. Overall, Bland-Altman plots demonstrated moderate to strong agreements between the power at the MLSS and the power at HRVt, with all HRVt overestimating the MLSS (range: − 14.6 to−19.8 W). All HRVt were detected at higher intensities (69.2–78.8%Pmax) compared to the MLSS (62.6–66.8%Pmax). The primarily vagally modulated parameter HRVtSD1 revealed higher correlations (r=0.66–0.76) and lower differences (16.8–19.9%) compared to the parameter HRVtSD2 (r=0.56–r=0.66; 22.4–22.9%). The data suggest a delayed vagal withdrawal during incremental exercise in obese and overweight individuals. For this population, the use of HRV to determine the MLSS seems questionable.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E58 - E64"},"PeriodicalIF":0.0,"publicationDate":"2019-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-0883-5473","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47626329","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

Insulin Sensitivity, Depression/Anxiety, and Physical Fitness in At-Risk Adolescents. 高危青少年的胰岛素敏感性、抑郁/焦虑和体能。

Sports medicine international open Pub Date : 2019-06-17 eCollection Date: 2019-04-01 DOI: 10.1055/a-0889-8653

Stephanie M Bruggink, Lauren Berger Shomaker, Nichole R Kelly, Bart E Drinkard, Kong Y Chen, Robert J Brychta, Omni Cassidy, Andrew P Demidowich, Sheila M Brady, Marian Tanofsky-Kraff, Jack A Yanovski

{"title":"Insulin Sensitivity, Depression/Anxiety, and Physical Fitness in At-Risk Adolescents.","authors":"Stephanie M Bruggink, Lauren Berger Shomaker, Nichole R Kelly, Bart E Drinkard, Kong Y Chen, Robert J Brychta, Omni Cassidy, Andrew P Demidowich, Sheila M Brady, Marian Tanofsky-Kraff, Jack A Yanovski","doi":"10.1055/a-0889-8653","DOIUrl":"10.1055/a-0889-8653","url":null,"abstract":"Poor physical fitness contributes to the early progression of cardiometabolic disease, yet the physiological and psychological factors underpinning poor fitness in at-risk adolescents are not well understood. In this study, we sought to determine the relationship of physical fitness with two developmental phenomena of adolescence, insulin resistance and depression/anxiety symptoms among at-risk youth. We conducted secondary data analyses of 241 overweight or obese adolescents (12-17 years), drawn from two study cohorts. Insulin sensitivity index was derived from oral glucose tolerance tests. Adolescents self-reported depressive symptoms and anxiety symptoms on validated surveys. A walk/run test was administered to determine perceived exertion and physical fitness (distance traveled). Insulin sensitivity was positively associated with walk/run distance ( b =0.16, P< 0.01), even after accounting for all covariates. Anxiety symptoms were inversely related to perceived exertion ( b =-0.11, P< 0.05), adjusting for covariates. These findings suggest that insulin resistance and anxiety symptoms are associated with different dimensions of physical fitness in overweight or obese adolescents and could both potentially contribute to declining fitness and worsening metabolic outcomes in at-risk youth.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 2","pages":"E40-E47"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c3/e3/10-1055-a-0889-8653.PMC6579727.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37345032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time Course Changes in Confirmed 'True' VO ₂ max After Individualized and Standardized Training. 个性化和标准化训练后确定的“真实”VO 2 max的时间课程变化。

Sports medicine international open Pub Date : 2019-06-11 eCollection Date: 2019-04-01 DOI: 10.1055/a-0867-9415

Ryan Weatherwax, Nigel Harris, Andrew E Kilding, Lance Dalleck

{"title":"Time Course Changes in Confirmed 'True' VO 2 max After Individualized and Standardized Training.","authors":"Ryan Weatherwax, Nigel Harris, Andrew E Kilding, Lance Dalleck","doi":"10.1055/a-0867-9415","DOIUrl":"https://doi.org/10.1055/a-0867-9415","url":null,"abstract":"This study sought to examine time course changes in maximal oxygen consumption (VO 2 max) confirmed with verification testing following 12 weeks of standardized vs. individualized exercise training. Participants (N=39) were randomly allocated to differing exercise intensity prescription groups: ventilatory threshold (individualized) or % heart rate reserve (standardized). At baseline, 4, 8, and 12 weeks, participants completed maximal exercise testing with a verification protocol to confirm 'true VO 2 max.' VO 2 max in the standardized group changed from 24.3±4.6 ml·kg -1 ·min -1 at baseline to 24.7±4.6, 25.9±4.7, and 26.0±4.2 ml·kg -1 ·min -1 at week 4, 8, and 12, respectively, with a significant difference (p<0.05) in VO 2 max at week 8 and 12 compared to baseline. The individualized group had increases in VO 2 max from online 2 9.5±7.5 ml·kg -1 ·min -1 at baseline to 30.6±8.4, 31.4±8.4, and 32.8±8.6 ml·kg -1 ·min -1 at week 4, 8, and 12, respectively. In the individualized group, there were significant differences (p<0.05) in VO 2 max from baseline to week 8 and 12 and a significant increase in VO 2 max from week 8 to 1 online 2 . Although not statistically significant, our preliminary data demonstrates a more rapid and potent improvement in VO 2 max when exercise intensity is individualized. This is the first investigation to employ use of the verification procedure to confirm 'true VO 2 max' changes following exercise training using ventilatory thresholds.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 2","pages":"E32-E39"},"PeriodicalIF":0.0,"publicationDate":"2019-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-0867-9415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37049533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Influence of Mouthguards on Physiological Responses in Rugby. 护齿器对橄榄球运动员生理反应的影响。

Sports medicine international open Pub Date : 2019-06-05 eCollection Date: 2019-01-01 DOI: 10.1055/a-0891-7021

Antina Schulze, Stefan Kwast, Martin Busse

{"title":"Influence of Mouthguards on Physiological Responses in Rugby.","authors":"Antina Schulze, Stefan Kwast, Martin Busse","doi":"10.1055/a-0891-7021","DOIUrl":"https://doi.org/10.1055/a-0891-7021","url":null,"abstract":"Mouthguards (MGs) are highly recommended in rugby. Airway obstruction and a resulting decrease in power output are potential disadvantages of their usage. The aim of the study was to assess possible limitations of \"vented\" (MG V ) and custom-made mouthguards (MG C ) on rugby players' performance. The MG effects were investigated in 13 male first-league rugby players ranging from 18-34 years old. First a lung function test was completed. Then a double incremental treadmill test was performed to measure maximum aerobic performance, ventilation, VO 2 , VCO 2 , heart rate, and lactate. Effects on sprint times (10 and 40 m) and countermovement jumps were also investigated. Peak flow values were significantly decreased with MG V by about 0.9 l/s. Neither ventilatory parameters nor oxygen uptake were affected by either of the mouthguards. Maximum lactate was significantly decreased in both MG types vs. no MG use. The maximum running velocity was similar in all tests. The aerobic energy turnover was moderately increased with the MG C and MG V . No effects were seen on sprint times or jump tests. Although neither type of mouthguard had a significant impact on maximum performance in treadmill running, the anaerobic energy turnover was decreased.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E25-E31"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-0891-7021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37324992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Activity Profiles by Position in Youth Elite Soccer Players in Official Matches. 青少年精英足球运动员在正式比赛中的活动概况。

Sports medicine international open Pub Date : 2019-05-28 eCollection Date: 2019-01-01 DOI: 10.1055/a-0883-5540

Svein Arne Pettersen, Tormod Brenn

{"title":"Activity Profiles by Position in Youth Elite Soccer Players in Official Matches.","authors":"Svein Arne Pettersen, Tormod Brenn","doi":"10.1055/a-0883-5540","DOIUrl":"10.1055/a-0883-5540","url":null,"abstract":"In order to investigate activity profiles and external load patterns in elite youth soccer players, we studied high-intensity activity patterns, maximum running speed, and temporary and end-of-match decline in external load in 54 U17 players (96 match observations) over a full season of official match play. Wide midfielders covered most high-intensity running (HIR) distance (1044.2 m), most sprinting distance (224.4 m), and the highest number of accelerations (185.2); center defenders had the lowest values for these activities (10 396.8 m, 508.3 m, 85.1 m, and 119.0), respectively. Wide midfielders had the highest and center defenders had the lowest maximum speed (30.3 km·h -1 and 28.6 km·h -1 ), respectively. During the matches, players in all playing positions displayed a significant drop in HIR distance, sprinting distance, and number of accelerations. This was especially pronounced in the 5 min following the 5-min peak period and in the last 5-min period for sprinting distance. There are substantial differences in activity profiles by positions, but all players show temporary and end-of-match drop in external load. The variation in activity profiles by playing position in this study may aid in the design of training programs. The considerable end-of-match drop in external load observed raises the question of the favorability of 90 min match times for U17 players.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E19-E24"},"PeriodicalIF":0.0,"publicationDate":"2019-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-0883-5540","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37287816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Running Performance and Position is Not Related to Decision-Making Accuracy in Referees 裁判员的跑位和跑位与决策准确性无关

Sports medicine international open Pub Date : 2019-04-01 DOI: 10.1055/a-0958-8608

A. Riiser, V. Andersen, A. Sæterbakken, Einar Ylvisåker, V. F. Moe

{"title":"Running Performance and Position is Not Related to Decision-Making Accuracy in Referees","authors":"A. Riiser, V. Andersen, A. Sæterbakken, Einar Ylvisåker, V. F. Moe","doi":"10.1055/a-0958-8608","DOIUrl":"https://doi.org/10.1055/a-0958-8608","url":null,"abstract":"Abstract We aimed to assess if running performance is related to decision-making accuracy in referees. We also investigated the relationships between movement, position, decision-making and time of infringement. The study included 347 free kicks and penalties awarded during all 15 home field matches for one team in the Norwegian top league. Movement and position were measured by a radio-based positioning system, and two external experts analysed the video clips. The referees made the correct decision in 98% of the assessed foul situations. There were no associations between the correctness and running speed at the time of the infringements or total distance accumulated during the 30 s prior to the infringement (p>0.08). Decision-making accuracy was not associated with the referees’ position in relation to the infringements (p=0.82) or the area where the infringements occurred (p=0.28). Most foul play incidents were sanctioned in the central area of the field (84%) where the distance to the infringements was shorter (13.4 m, 95% CI 12.8–14.0) than in the lateral areas (21.9 m, 95% CI 20.4–23.4). Norwegian top referees were practically always right when they interfered, possess the necessary fitness to avoid fatigue that would influence decision-making accuracy, and maintain adequate positional ability throughout the matches.","PeriodicalId":74857,"journal":{"name":"Sports medicine international open","volume":"3 1","pages":"E66 - E71"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1055/a-0958-8608","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47164565","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: 8