International Journal of Strength and Conditioning最新文献_第9页

Profiling Change of Direction Ability Using Sub-phase 5-0-5 Analysis 用分阶段5-0-5分析分析方向能力变化

International Journal of Strength and Conditioning Pub Date : 2022-03-18 DOI: 10.47206/ijsc.v2i1.100

Chloe Ryan, Aaron M. Uthoff, C. McKenzie, J. Cronin

{"title":"Profiling Change of Direction Ability Using Sub-phase 5-0-5 Analysis","authors":"Chloe Ryan, Aaron M. Uthoff, C. McKenzie, J. Cronin","doi":"10.47206/ijsc.v2i1.100","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.100","url":null,"abstract":"Change of direction (COD) ability is an important component for most field and court sport athletes. The modified 5-0-5 COD test is a commonly used test to measure 180-degree COD performance, the diagnostic value of which can be advanced using a multiple-timing light set-up to divide the test into sub-phases. The aim of this research was to determine what proportion of the 5-0-5 COD test was spent performing the 180-degree COD, whether anthropometry and position of the player influenced the sub-phase performance and provide an alternative approach to improve diagnostics for coaches and practitioners. Ten elite female netball athletes participated in this study. Dual beam timing gates set at 0, 2, and 4 m were used to isolate the phases of the 5-0-5 COD test and quantify COD performance. Independent t-tests were used to assess statistical significance (p<0.05) between anthropometry, position, and performance of the sub-phases. Rank-order of sub-phase performance was also conducted to determine individualized performance across phases. The highest percentage of time was spent during the 180-degree turn and reacceleration 1 phase (~23%). Heavier athletes were significantly slower for deceleration (9.26%), 180-degree turn (17.1%), reacceleration 2 (7.32%) and total time (8.68%), however no differences were identified between taller and shorter players. A sub-phase rank order table was used to provide diagnostic and training insights that allow more targeted programming to improve COD performance. ","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128148802","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 Total Score of Athleticism to Estimate the Amount of Variance Explained in On-Field Performance Within Collegiate American Football Players 用运动能力总分来估计美国大学橄榄球运动员场上表现的方差

International Journal of Strength and Conditioning Pub Date : 2022-03-10 DOI: 10.47206/ijsc.v2i1.94

Nicolas M Philipp, D. Crawford, A. Fry

{"title":"A Total Score of Athleticism to Estimate the Amount of Variance Explained in On-Field Performance Within Collegiate American Football Players","authors":"Nicolas M Philipp, D. Crawford, A. Fry","doi":"10.47206/ijsc.v2i1.94","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.94","url":null,"abstract":"The identification of sport and position-specific key performance indicators has been of increased interest to practitioners working within high performance sport settings. The aim of this study was to create statistical models, across a spectrum of position groups, that explain the largest amount of variance in on-field performance over four collegiate American football seasons. A total of four position groups were analyzed, including Wide Receiver/Tight End (n = 29), Running Backs (n = 8), Linebacker/Defensive Line (n =41), Defensive Backs (n = 28). Different tests of physical performance (back squat, bench press, hang clean, 40-yard dash, pro-agility, L-drill, vertical jump, and broad jump) were set as the independent variables, while a Total Score of On-Field Performance, consisting of position-specific game statistics was set as the dependent variable. Linear mixed models, using backwards model selection were used to identify models that best fit the position-specific data. Results revealed that models consisted of at least three different physical performance test, were position-specific, and explained the variance in on-field performance to different degrees. Significant correlations were found between physical performance models and on-field performance. Results from our study may be of interest to practitioners working within American football that are interested in maximizing success through and individual approach towards the implementation of training.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134279023","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

The Acute and Delayed Effects of Foam Rolling Duration on Male Athlete’s Flexibility and Vertical Jump Performance 滚泡时间对男子运动员柔韧性和垂直跳性能的急性和延迟效应

International Journal of Strength and Conditioning Pub Date : 2022-02-25 DOI: 10.47206/ijsc.v2i1.90

Callum Blades, T. Jones, C. Brownstein, Kirsty Hicks

{"title":"The Acute and Delayed Effects of Foam Rolling Duration on Male Athlete’s Flexibility and Vertical Jump Performance","authors":"Callum Blades, T. Jones, C. Brownstein, Kirsty Hicks","doi":"10.47206/ijsc.v2i1.90","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.90","url":null,"abstract":"Foam rolling (FR) durations totaling ≤60 s per muscle are reported to acutely increase flexibility and vertical jump performance. However, limited research has investigated whether these benefits can outlast the inactive post-warmup preparatory period that typically separates warmups from the start of sporting competition. Eleven male athletes (height 1.77 0.09 m, body mass 78.0 17.0 kg, age 22 2 years) completed familiarization, followed by three experimental trials in a randomized and counterbalanced repeated measures crossover design. Trials commenced with 5 min jogging, before ankle dorsiflexion range of motion (ADF-ROM), sit and reach (S&R), countermovement jump (CMJ) and squat jump (SJ) baseline testing. Participants then sat inactively for 10 min (control) or performed lower extremity FR totaling either 30 (30FR) or 60 s (60FR) that targeted four agonist-antagonist leg muscles. Testing was then repeated before and after a simulated inactive 15 min post-warmup preparatory period to establish the acute and delayed effects of FR on performance. A two-way repeated measures analysis of variance was used to identify any significant interaction effects between conditions (30FR, 60FR, control) and timepoint (baseline, acute, delayed). No significant condition x timepoint interaction effect was detected for the ADF-ROM (f = 1.63, p = 0.19), S&R (f = 0.80, p = 0.54), CMJ ((f = 0.83, p = 0.99) or SJ (f = 0.66, p = 0.99). Therefore, FR totaling ≤60 s appears insufficient to enhance flexibility or vertical jump performance in male athletes.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124151682","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

Comparison of In-game External Load Metrics Among Positions and Between Halves for Division I Collegiate Women’s Lacrosse Athletes I级大学女子曲棍球运动员在位置和半场之间的游戏外部负载参数比较

International Journal of Strength and Conditioning Pub Date : 2022-02-11 DOI: 10.47206/ijsc.v2i1.78

J. Kilian, Kristen Snyman, Theresa L Miyashita

{"title":"Comparison of In-game External Load Metrics Among Positions and Between Halves for Division I Collegiate Women’s Lacrosse Athletes","authors":"J. Kilian, Kristen Snyman, Theresa L Miyashita","doi":"10.47206/ijsc.v2i1.78","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.78","url":null,"abstract":"External load has become a common metric for coaches to track the activity profiles of athletes during training and competition. The advent of wearable technology has made external load monitoring accessible for more coaches. The purpose of this study was to compare positional (attack, midfield, and defense) and game (first half to second) external loads. An NCAA Division I women’s lacrosse team was recruited to wear triaxal accelerometers and GPS units during five non-conference games during the 2020 regular season. The external load metrics evaluated for this study included total distance, sprint distance (> 19 km∙hr-1), number of power plays (> 3 m·s-2), top speed, and PlayerLoad. Significance was set at p < 0.05. No significant differences among positions were observed for full game measures (p > 0.05). A significant main effect for time was observed for sprint distance (midfield; p < 0.001 ) and power plays (midfield; p < 0.001 and defense; p = 0.004). While no significant differences occurred for activity profiles among positions, high-intensity efforts (sprint distance and power plays) were significantly less in the second half, likely due to fatigue. Coaches and sports scientists can use this information to manage in-game fatigue through tactics such as strategic substitutions and time-outs, thus preserving the intensity of the activity profiles late in the game.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133555657","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: 6

Application of Accentuated Eccentric Loading to Elicit Acute and Chronic Velocity and Power Improvements: A Narrative Review 应用强化偏心载荷引起急性和慢性速度和功率的改进:叙述回顾

International Journal of Strength and Conditioning Pub Date : 2022-02-03 DOI: 10.47206/ijsc.v2i1.80

J. Merrigan, Jonathon Borth, Christopher B. Taber, T. Suchomel, Margaret T. Jones

{"title":"Application of Accentuated Eccentric Loading to Elicit Acute and Chronic Velocity and Power Improvements: A Narrative Review","authors":"J. Merrigan, Jonathon Borth, Christopher B. Taber, T. Suchomel, Margaret T. Jones","doi":"10.47206/ijsc.v2i1.80","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.80","url":null,"abstract":"Accentuated eccentric loading (AEL) employs heavier load magnitudes in eccentric actions than concentric actions of complete stretch-shortening cycles. In doing so, unique neuromuscular and molecular responses are expected to result in acute post-activation performance enhancements, as evidenced by increased movement velocity or power. Improvements are dependent upon load selection, which varies across exercises, such as jumps and bench press throws (eccentric: 20-40 kg or 20-30% of body mass; concentric: body mass only), and squats and bench press (eccentric: 77.3-120% One-Repetition Maximum (1-RM); concentric: 30-90% 1-RM). The efficacy of AEL is dependent upon the concentric load used, which in turn is influenced by the magnitude of the eccentric load. Greater strength relative to body mass may enable the maintenance of technique and pacing during AEL, necessary for resultant performance enhancements, particularly when using eccentric loads exceeding the individual’s concentric 1-RM. Before prescribing AEL practitioners should consider: training experience, strength relative to body mass, the particular exercise, AEL application method, and the magnitude of both eccentric and concentric loads. Thus, the aims of this brief review are to describe: 1) neuromuscular and molecular constructs of AEL; 2) acute effects of AEL; 3) chronic effects of AEL; 4) loading considerations; 5) practical applications.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116646736","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: 5

Influence of Tactical Formation on Average and Peak Demands of Elite Soccer Match-Play 战术阵型对精英足球对抗赛平均需求和峰值需求的影响

International Journal of Strength and Conditioning Pub Date : 2022-01-21 DOI: 10.47206/ijsc.v2i1.75

Alexander R. Calder, T. Gabbett

{"title":"Influence of Tactical Formation on Average and Peak Demands of Elite Soccer Match-Play","authors":"Alexander R. Calder, T. Gabbett","doi":"10.47206/ijsc.v2i1.75","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.75","url":null,"abstract":"Global Positioning Systems (GPS) have provided practitioners with information on the activity profiles of team-sport players. There is no available literature identifying the average or peak physical demands of elite soccer in the USA. This investigation aims to quantify the activity profiles and most demanding passages of elite soccer competition within different positions, periods, and tactical formations. Activity profiles were captured from 449 whole-period, and 661 peak-period data from 24 field players across a 31-game Major League Soccer season. Total distance covered (metres), average speed (m·min-1), and number of acceleration and deceleration (m·s-2) efforts were used to comprise whole-period profiles. Peak values for speed (m·min-1) were obtained by using a moving-average approach for durations lasting 1, 2, 3, 5, and 10 minutes. Across all positions the 4-2-3-1, 3-4-3, and 4-3-3 formations showed a decrease in average speed between the first and second halves. The 4-3-1-2 yielded greatest whole-period accelerations and decelerations for full backs, and overall distance covered and average speed for strikers. Most peak intensities were observed in the first half of match-play, with attacking midfielders and strikers demonstrating their greatest activity during the first half of a 4-3-1-2 formation. Altering tactical formations results in different physical outputs for all positional groups. Depending on the formation implemented, positional groups resulted in differences, with physical outputs, between halves during match-play.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125467643","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 Effects of Vertical vs. Horizontal plyometric Training on Sprinting Kinetics in Post Peak Height Female Student Athletes 垂直与水平增强训练对高峰后身高女学生运动员冲刺动力学的影响

International Journal of Strength and Conditioning Pub Date : 2022-01-10 DOI: 10.47206/ijsc.v2i1.89

K. Talukdar, C. Harrison, M. McGuigan, R. Borotkanics

{"title":"The Effects of Vertical vs. Horizontal plyometric Training on Sprinting Kinetics in Post Peak Height Female Student Athletes","authors":"K. Talukdar, C. Harrison, M. McGuigan, R. Borotkanics","doi":"10.47206/ijsc.v2i1.89","DOIUrl":"https://doi.org/10.47206/ijsc.v2i1.89","url":null,"abstract":"Plyometric training is a form of jump training that is a useful method to improve sprinting speed due to its propensity to improve neural efficiency, increase joint stiffness and contraction speed. While research has shown that plyometrics can improve jumping and sprinting performance, no studies have compared the effects of different types of plyometric training on sprinting speed in young females. Therefore, the aim of the study was to compare different forms of plyometric training (horizontal and vertical) on sprinting performance in young females. Thirty young females from a private girls college were randomly divided into two groups and trained for seven weeks, twice a week; vertical plyometric (n=11, age 13.50 ± 0.96, peak heigh velocity-PHV: 1.60 ± 1.14), horizontal plyometric training (n=10, 13.40 ± 0.92, PHV:1.60 ± 0.93), and a physical education class as a control (n=15, age, 15.60 ± 0.31, PHV: 2.90 ± 0.55). Participants were tested for sprinting kinetics i.e. force (Fo), maximum power (Pmax), theoretical velocity (Vo), maximal velocity (Vmax), 10, 20 and 30 m split times using a radar gun over 30 m, isometric strength, vertical jump height and horizontal jump distance before and after the intervention. Both the intervention groups significantly improved all performance variables (g= 0.32- 1.30; p<0.05). The vertical group improved all kinetic variables except Fo and Pmax whereas the horizontal group improved all kinetic variables with a greater effect size g= 0.40-1.30. In comparison to the control group, the vertical group significantly improved Vo, Vmax, vertical and broad jump scores whereas the horizontal group significantly improved broad jump and 20 m split time scores (p<0.05). The findings of this study suggest that horizontal plyometric training is more effective in improving sprinting kinetics.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128391470","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

Practice versus Game External Load Measures in Starters and Non-Starters of a Men’s Collegiate Soccer Team 大学男子足球队首发与非首发球员训练与比赛的外部负荷测量

International Journal of Strength and Conditioning Pub Date : 2021-12-13 DOI: 10.47206/ijsc.v1i1.76

J. Fields, J. Merrigan, M. Feit, Margaret T. Jones

{"title":"Practice versus Game External Load Measures in Starters and Non-Starters of a Men’s Collegiate Soccer Team","authors":"J. Fields, J. Merrigan, M. Feit, Margaret T. Jones","doi":"10.47206/ijsc.v1i1.76","DOIUrl":"https://doi.org/10.47206/ijsc.v1i1.76","url":null,"abstract":"Monitoring external loads may minimize injury risk and improve physical performance. The purpose was to describe the external loads of a men’s collegiate soccer team during practice and games at the start of in-season play. In the first 2 weeks of the competitive season, National Collegiate Athletic Association Division I soccer athletes (n=19; mean±SD, age: 20.3±0.9 yr; body mass: 77.9±6.8kg; body height: 178.87±7.18cm; body fat: 10.0±5.0%; VO2max: 65.39±7.61mL/kg/min) wore a global positional system device (GPS/GNSS) during practices (n=8) and games (n=3). Starters were classified as players who maintained a minimum playing time of 45 minutes per game (n=10); other players were considered non-starters (n=9). External load metrics collected were: total distance (TD), player load (PL), high-speed distance (HSD, >13 mph (5.8 m/s)), high inertial movement analysis (IMA, >3.5m/s2), and repeated high intensity efforts (RHIE). Multivariate and repeated measures analyses of variance assessed differences in external load measures for practices and games in starters and non-starters. Relative to game loads, practices were quantified as high (>1 SD above the mean), medium (1 SD below the mean), low (2 SD below the mean) and very low (3 SD below the mean). For starters and non-starters, TD, PL, HSD, IMA, and RHIEs were lower in practices compared to games (p<0.001). No practices were classified as high or medium for any external load measure, with the majority of practices (75-100%) being classified as very low. Therefore, practice did not simulate game volumes or intensities. An individualized approach to monitoring is recommended to ensure starters receive adequate recovery and non-starters receive exposure to game-load physical stress.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126405579","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 effects of a sled push at different loads on 20 metre sprint time in well-trained soccer players 不同载荷下雪橇推动对训练有素的足球运动员20米冲刺时间的影响

International Journal of Strength and Conditioning Pub Date : 2021-11-24 DOI: 10.47206/ijsc.v1i1.77

Nick Grimes, Jorge Arede, Benjamin Drury, Steve W. Thompson, John F. T. Fernandes

{"title":"The effects of a sled push at different loads on 20 metre sprint time in well-trained soccer players","authors":"Nick Grimes, Jorge Arede, Benjamin Drury, Steve W. Thompson, John F. T. Fernandes","doi":"10.47206/ijsc.v1i1.77","DOIUrl":"https://doi.org/10.47206/ijsc.v1i1.77","url":null,"abstract":"This study determined the effects of a single sled push at different loads on sprint performance in competitive male soccer players. Twenty male competitive outfield soccer players (age 19.6±1.3y, body mass 73.6±8.2kg) were split into experimental (n=10) and control groups. In the experimental group, 20m linear sprint time was measured immediately before and 5, 6 and 7minutes after the sled push with either 50 or 100% body mass. The control group performed the 20m sprints only. A repeated measures ANOVA comparing control and experimental groups revealed no effects of time, group or time by group interaction for either experimental condition (all P>0.05). The repeated measures ANOVA compared the experimental conditions revealed effects of time (P=0.034) and group (P=0.002), but not time by group (P>0.05). The effects sizes demonstrated within group effects on sprint time that were small to moderate (-0.26 to 0.71) and trivial to small (-0.31 to 0.09) for the 50% and 100% body mass condition, respectively. These findings demonstrate that a sled push has no significant effect on 20 m sprint time in competitive footballers. If coaches continue to prescribed a sled push before sprinting, a single 15 m push with 50% body mass could have positive benefits.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117255495","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

Exploring The Power Clean 探索清洁能源

International Journal of Strength and Conditioning Pub Date : 2021-11-12 DOI: 10.47206/ijsc.v1i1.95

Thomas Huyghe, Brent Goriss, Ernest DeLosAngeles, S. Bird

引用次数: 0