International Journal of Strength and Conditioning最新文献

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Change Of Direction Actions in Goal Scoring Situations in Male and Female Professional Soccer 男女职业足球运动员进球时的变向动作
International Journal of Strength and Conditioning Pub Date : 2024-03-08 DOI: 10.47206/ijsc.v4i1.192
David Martinez Hernandez, Paul A Jones
{"title":"Change Of Direction Actions in Goal Scoring Situations in Male and Female Professional Soccer","authors":"David Martinez Hernandez, Paul A Jones","doi":"10.47206/ijsc.v4i1.192","DOIUrl":"https://doi.org/10.47206/ijsc.v4i1.192","url":null,"abstract":"The aim of this study was to analyse the frequency of change of direction (COD) actions in goal scoring situations. Data was collected through time motion analysis of goal scoring actions from teams participating in English Premier League (EPL) and Women’s Super League (WSL) during the 2018/2019 season using a modified version of the Bloomfield Movement Classification with differences analysed through chi-square (p < 0.05). \u0000In (total percentage [95% CI] 71.6% (±1.7%) and 70.6% (±3.1%) of players involvements in EPL and WSL there was a COD action. For EPL and WSL, respectively, attackers performed COD actions in 71.9% (±2.3%) and 72.9% (±4.1%) of the involvements while defenders in 71.2% (±2.6%) and 67.8% (±4.7%). In 56.1% (±1.9%) and 57.1% (±3.3%) of the involvements there was at least 1 COD action performed at high intensity for EPL and WSL, respectively. \u0000Soccer players are frequently exposed to different COD actions during goal involvements, with these being performed frequently at high intensity and so, this physical ability could play an important role in the performance outcomes of a match. Therefore, emphasis should be placed on increasing player’s COD speed capabilities taking into account the tendency for specific COD actions for different players’ based on their roles.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"29 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140257689","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
Forearm Position Influences Triceps Brachii Activation During Triceps Push-Down Exercise 前臂位置影响肱三头肌俯卧撑运动中肱三头肌的激活程度
International Journal of Strength and Conditioning Pub Date : 2024-02-23 DOI: 10.47206/ijsc.v4i1.250
M. M. Villalba, R. A. Fujita, Claudinei Iossi Junior, Matheus Machado Gomes
{"title":"Forearm Position Influences Triceps Brachii Activation During Triceps Push-Down Exercise","authors":"M. M. Villalba, R. A. Fujita, Claudinei Iossi Junior, Matheus Machado Gomes","doi":"10.47206/ijsc.v4i1.250","DOIUrl":"https://doi.org/10.47206/ijsc.v4i1.250","url":null,"abstract":"Introduction: This study investigated the influence of forearm position (supinated or pronated) on the EMG activity of the triceps brachii lateralis head (TLA), triceps brachii longus head (TLO), flexor carpi radialis (FR), and extensor carpi radialis (ER) muscles during the triceps push-down exercise. Also, we analyzed the effect of different grips (handle vs standard padded pulley strap) to verify EMG activity of these muscles. Methods: Twenty-two adults participated in this study. They performed the single-arm triceps push-down exercise in four conditions: pronated forearm with handle (PRON-H), supinated forearm with handle (SUP-H), pronated forearm with standard padded pulley strap (PRON-S), and supinated forearm with standard padded pulley strap (SUP-S). Surface electrodes were placed over the TLA, TLO, FR, and ER on the dominant side. Results: The TLO showed higher EMG activity for SUP-H compared to all other conditions (p<0.001). Also, the FR EMG activity was higher with PRON-H condition (p<0.001), while the ER EMG activity was higher with SUP-H condition (p<0.001). Regarding the number of repetitions, participants performed fewer repetitions in the SUP-H condition compared to the PRON-H (p<0.001). Conclusion: Our study suggests that the position of the forearm during the triceps push-down exercise has a significant impact on the recruitment of specific muscles and overall exercise performance.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"12 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437432","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
Maturation and Bio-Banding in Youth Soccer Players: Insights from Turkish Male Academy across U-10 to U-15 Age 青少年足球运动员的成熟和生物带:土耳其男子足球学院对 U-10 至 U-15 年龄段球员的观察
International Journal of Strength and Conditioning Pub Date : 2024-02-16 DOI: 10.47206/ijsc.v4i1.302
S. Shahidi, Atakan Çetiner, Ferhat Güneş, Joseph I. Esformes, Selçuk Karakaş
{"title":"Maturation and Bio-Banding in Youth Soccer Players: Insights from Turkish Male Academy across U-10 to U-15 Age","authors":"S. Shahidi, Atakan Çetiner, Ferhat Güneş, Joseph I. Esformes, Selçuk Karakaş","doi":"10.47206/ijsc.v4i1.302","DOIUrl":"https://doi.org/10.47206/ijsc.v4i1.302","url":null,"abstract":"Soccer academies are vital in identifying and nurturing young talent for senior-level competition. Relative age and biological maturation influence player performance and selection in youth soccer. While often grouped by Chronological Age (CA), variations within a CA category can lead to differences in maturation, with the Relative Age Effect (RAE) favoring older players' performance. Maturation, marked by physical and cognitive development, can significantly affect performance. Therefore, this study examined the interrelations between relative age, maturation status, and bio-banding in youth soccer players in U10 to U15 age cohorts. This study examined 60 male soccer players aged 10 to 15 (mean ± standard deviation; age: 12.6 ± 1.7 years; Weight: 49 ± 15.1 kg; Height: 157.2 ± 12.8 cm; sitting height: 69.7 ± 6.7 cm), assessing anthropometric measurements, maturation status, and physical performance. Players' physical attributes and performance levels were influenced by their maturation status rather than their relative age, with maturation-related disparities in strength and jump performance observed among age groups. Bio-banding, a strategy categorizing players by maturation status, created more equitable groups with homogenized physical attributes and performance. Early-maturing players showed advantages in physical attributes, while late-maturing players displayed enhanced leadership and self-confidence. Understanding maturation status is crucial for accurate performance assessment and equitable player grouping in youth soccer. This study underscores the significance of considering maturation status as a distinct determinant in evaluating young soccer players.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"56 50","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139960830","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
Velocity-Specific Relationships Among Eccentric and Concentric Force Velocity Profiles and Jumping Performance 偏心和同心力速度曲线与跳跃成绩之间的特定速度关系
International Journal of Strength and Conditioning Pub Date : 2024-01-19 DOI: 10.47206/ijsc.v4i1.264
Leland Barker, Alex Loosbrock, Evan Spry, Anthony Ciccone, T. Grindstaff
{"title":"Velocity-Specific Relationships Among Eccentric and Concentric Force Velocity Profiles and Jumping Performance","authors":"Leland Barker, Alex Loosbrock, Evan Spry, Anthony Ciccone, T. Grindstaff","doi":"10.47206/ijsc.v4i1.264","DOIUrl":"https://doi.org/10.47206/ijsc.v4i1.264","url":null,"abstract":"The purpose of this study is to determine the relationships among force velocity profiles during eccentric only movements (eFVP), concentric only movements (cFVP), and dynamic performance during a countermovement jump (CMJ), squat jump (SJ), and drop jump (DJ). Nineteen collegiate baseball players (1.85 ± 0.04 m, 86.4 ± 8.2 kg, 21.1 ± 1.8 years) from a single NCAA Division I team performed CMJ, SJ, and DJ, drop landings from varying heights, and hex bar jumps with varying weights. FVPs were created with a linear regression using the drop landings for eFVP and hex bar jumps for cFVP, which were used to calculate slopes and area under the entire FVP and velocity-specific regions. Correlations analyzed the results with bootstrapping for 95% confidence intervals. Area under eFVP correlated with cFVP at r=0.51 (p<0.05), cFVP slope presented strong correlations with CMJ height and DJ height while eFVP slopes did not relate to jumping performance or metrics. Area under the faster regions of cFVP and eFVP produced moderate and strong relationships to jumping performance. The area under the FVP, especially when separated into velocity-specific bands, may be a key metric which can audit or provide insight into velocity-based training program effectiveness and athlete comparisons.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"5 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139525294","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
Physiological and Performance Adaptations to Interval Training in Endurance-Trained Cyclists: An Exploratory Systematic Review and Meta-Analysis 耐力训练自行车运动员对间歇训练的生理和性能适应:探索性系统回顾和元分析
International Journal of Strength and Conditioning Pub Date : 2024-01-12 DOI: 10.47206/ijsc.v4i1.271
Bernardo Norte, James Steele, James Wright
{"title":"Physiological and Performance Adaptations to Interval Training in Endurance-Trained Cyclists: An Exploratory Systematic Review and Meta-Analysis","authors":"Bernardo Norte, James Steele, James Wright","doi":"10.47206/ijsc.v4i1.271","DOIUrl":"https://doi.org/10.47206/ijsc.v4i1.271","url":null,"abstract":"Background:  In endurance cycling, both high-intensity interval training (HIIT) and sprint interval training (SIT) have become popular training modalities due to their ability to elicit improvements in performance. Studies have attempted to ascertain which form of interval training might be more beneficial for maximising cycling performance as well as a range of physiological parameters, but an amalgamation of results which explores the influence of different interval training programming variables in trained cyclists has not yet been conducted. \u0000Objective: The aims of this study were to: (1) systematically investigate training interventions to determine which training modality, HIIT, SIT or low- to moderate-intensity continuous training (LIT/MICT), leads to greater physiological and performance adaptations in trained cyclists; and (2) determine the moderating effects of interval work-bout duration and intervention length on the overall HIIT/SIT programme. \u0000Data Sources: Electronic database searches were conducted using SPORTDiscus and PubMed. \u0000Study Selection: Inclusion criteria were: (1) at least recreationally-trained cyclists aged 18–49 years (maximum/peak oxygen uptake [V̇O2max/V̇O2peak] ≥45 mL·kg-1·min-1); (2) training interventions that included a HIIT or SIT group and a control group (or two interval training groups for direct comparisons); (3) minimum intervention length of 2 weeks; (4) interventions that consisted of 2–3 weekly interval training sessions­. \u0000Results: Interval training leads to small improvements in all outcome measures combined (overall main effects model, SMD: 0.33 [95%CI = 0.06 to 0.60]) when compared to LIT/MICT in trained cyclists. At the individual level, point estimates favouring HIIT/SIT were negligible (Wingate model: 0.01 [95%CI = -3.56 to 3.57]), trivial (relative V̇O2max/V̇O2peak: 0.10 [95%CI = -0.34 to 0.54]), small (absolute V̇O2max/V̇O2peak: 0.28 [95%CI = 0.15 to 0.40], absolute maximum aerobic power/peak power output: 0.38 [95%CI = 0.15 to 0.61], relative absolute maximum aerobic power/peak power output: 0.43 [95%CI = -0.09 to 0.95], physiological thresholds: 0.46 [95%CI = -0.24 to 1.17]), and large (time-trial/time-to-exhaustion: 0.96 [95%CI = -0.81 to 2.73]) improvements in physiological/performance variables compared to controls, with very imprecise interval estimates for most outcomes. In addition, intervention length did not contribute significantly to the improvements in outcome measures in this population, as the effect estimate was only trivial (βDuration: 0.04 [ 95%CI = -0.07 to 0.15]). Finally, the network meta-analysis did not reveal a clear superior effect of any HIIT/SIT types when directly comparing interval training differing in interval work-bout duration. \u0000Conclusion: The results of the meta-analysis indicate that both HIIT and SIT are effective training modalities to elicit physiological adaptations and performance improvements in trained cyclists. Our analyses highlight that the optimisa","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"4 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139532642","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 Co-Contraction Training on Neuromuscular Outcomes of Elbow Flexors and Extensors: A Systematic Review and Meta-Analysis 协同牵引训练对肘关节屈伸神经肌肉成果的影响:系统回顾与元分析
International Journal of Strength and Conditioning Pub Date : 2024-01-05 DOI: 10.47206/ijsc.v4i1.243
M. M. Villalba, R. A. Fujita, Karine Josibel Velasques Stoelben, Nilson Ribeiro dos Santos Silva, Matheus Machado Gomes
{"title":"Effects of Co-Contraction Training on Neuromuscular Outcomes of Elbow Flexors and Extensors: A Systematic Review and Meta-Analysis","authors":"M. M. Villalba, R. A. Fujita, Karine Josibel Velasques Stoelben, Nilson Ribeiro dos Santos Silva, Matheus Machado Gomes","doi":"10.47206/ijsc.v4i1.243","DOIUrl":"https://doi.org/10.47206/ijsc.v4i1.243","url":null,"abstract":"Co-contraction training has been proposed to improve muscle strength in the absence of external equipment, yet it is needed to elucidate the effects of co-contraction training and its applicability. Thus, we synthesized the effects of co-contraction training on elbow muscle strength, myoelectric activity, and muscle thickness. We searched papers from MEDLINE via PubMed, Web of Science, Scopus and Embase databases. The inclusion criteria were studies comprising adults between 18-64 years old; investigating chronic effects of co-contraction training on elbow muscles; comparing pre- and post-intervention or control values; presenting any of the outcomes; randomized, quasi-experimental, pre- and post-design; in English. Seven studies met the inclusion criteria. We performed a systematic review and meta-analysis following PRISMA recommendations. We used the revised RoB 2, ROBINS-I to verify the level of evidence. We also included a questionnaire for biomechanical studies and GRADE analysis. We extracted data independently by two investigators, considering the characteristics of study, participants and training, outcomes, and results. We calculated the effect sizes for each outcome. The analysis was carried out by combining and dividing flexors and extensors in a subgroup analysis. Comparing the experimental vs. control group, our results showed that cocontraction training increased isometric strength (SMD=0.51 [0.19, 0.83]) and agonist myoelectric activity (SMD=0.54 [0.25, 0.83]). Comparing pre- vs. post-training, co-contraction training also improved isometric strength (SMD=1.28 [0.75, 1.81]); concentric elbow extensor strength (SMD=0.64 [0.01, 1.26]); and myoelectric activity (SMD=0.46 [0.18, 0.73]). No effect was observed for muscle thickness. The co-contraction training improves muscle performance without morphological changes.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"65 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139383492","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
Accuracy of Bioelectric Impedance Analysis Devices to Estimate Body Fat and Fat-Free Mass in College Women Athletes 生物电阻抗分析设备估算大学女运动员体脂和无脂质量的准确性
International Journal of Strength and Conditioning Pub Date : 2023-12-15 DOI: 10.47206/ijsc.v3i1.265
Ashly Hilfer, Allison Oligchlaeger, Madison Henderson, Molly Whitehead, Jana Arabas, Jerry Mayhew, Jeremy Houser
{"title":"Accuracy of Bioelectric Impedance Analysis Devices to Estimate Body Fat and Fat-Free Mass in College Women Athletes","authors":"Ashly Hilfer, Allison Oligchlaeger, Madison Henderson, Molly Whitehead, Jana Arabas, Jerry Mayhew, Jeremy Houser","doi":"10.47206/ijsc.v3i1.265","DOIUrl":"https://doi.org/10.47206/ijsc.v3i1.265","url":null,"abstract":"Background: Body composition is frequently measured in women athletes to evaluate training changes, assist in dietary planning, and avoid the female athlete triad. Measurements to monitor %fat and fat-free mass (FFM) can provide valuable information for coaches and athletes throughout the training process. However, questions remain concerning the accuracy of various methods used to measure %fat. The purpose of this study was to assess the accuracy of bioelectric impedance analysis (BIA) devices to estimate %fat and FFM compared to dual-energy X-ray absorptiometry (DXA) in college women athletes. \u0000Methods: A cross-section design was employed to assess %fat and FFM among college women athletes. Fiftyseven athletes (age = 20.0   1.4 yrs, height = 179.2   6.0 cm, weight = 74.3   4.4 kg) from soccer (n = 29), basketball (n = 15), and swimming (n = 13) had %fat estimated from four single-frequency BIA devices. Two BIA devices had general population equations (BIA1 and BIA2) and two had athletespecific equations (BIA3 and BIA4). Each device had proprietary equations for estimating %fat and was not capable of being updated. Each device had a 2-point electrode contact with either hands or feet. DXA %fat served as the criterion measurement. Percent fat was estimated directly by each device, and FFM was calculated as body mass minus fat mass. All measures were completed in single sessions for each athletic group with different sports groups being measured at the onset of their competitive season. Athletes were measured between 1400 and 1600 hours in a rested stated with hydration assumed and after voiding the bladder. A repeated-measures one-way analysis of variance (ANOVA) with Bonferroni post hoc testing was used to evaluate differences among measurement techniques with significance set at p<0.05. \u0000Results: Three arm-to-arm BIA devices (BIA1, BIA2, and BIA3) were not significantly different in %fat estimates (23.1 ± 5.0%, 23.7 ± 4.7%, and 23.6 ± 4.3%, respectively) but were significantly lower than DXA (29.5 ± 5.1%). The leg-to-leg athletic BIA (BIA4) had a significantly higher %fat estimate (24.6 ± 5.7%) than BIA1 but was not significantly different from BIA2 and BIA3. The correlation of DXA %fat with BIA1 (r = 0.84), BIA2 (r = 0.85), and BIA3 (r = 0.85) were significant but not statistically different across the 3 devices. BIA4 had a significantly lower correlation (r = 0.66) with DXA %fat. The lower estimates in %fat resulted in significantly higher calculated FFM values for BIA1 (51.1 ± 5.5 kg), BIA2 (50.8 ± 59 kg), BIA3 (50.9 ± 6.9 kg), and BIA4 (50.1 ± 5.8 kg) than for DXA (47.5 ± 5.9 kg). However, all BIA estimates of FFM were highly correlated with DXA FFM (r = 0.90-0.93). Limits of agreement analysis indicatedthe average bias ranged from 2.2 kg (BIA4) to 3.4 kg (BIA1). \u0000Conclusion: Single-frequency BIA devices utilized in this study tend to underestimate %fat and overestimate FFM compared to DXA in college women athletes. However, high correlatio","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"43 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995897","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
Deadlift Biomechanics across Multiple Sets in Resistance Trained Males 阻力训练男子多组举重的生物力学特性
International Journal of Strength and Conditioning Pub Date : 2023-12-08 DOI: 10.47206/ijsc.v3i1.233
Daniel Scherrer, Brandon Nunley, Jeffrey Eggleston, John Harry
{"title":"Deadlift Biomechanics across Multiple Sets in Resistance Trained Males","authors":"Daniel Scherrer, Brandon Nunley, Jeffrey Eggleston, John Harry","doi":"10.47206/ijsc.v3i1.233","DOIUrl":"https://doi.org/10.47206/ijsc.v3i1.233","url":null,"abstract":"This study sought to determine whether the deadlift exercise using the 5-by-5 scheme can be performed at a commonly prescribed moderate-to-high load with consistent mechanical output among sets with respect to concentric and eccentric rate of force development [RFD], rate of force attenuation [RFA; i.e., the rate at which the application of force is reduced], total lower limb joint angular work, and the contributions of the individual joints to total lower limb angular work. Twelve resistance-trained males [21 ± 1 y; 1.8 ± 0.56 m; 89.1 ± 15.48 kg] completed five sets of five repetitions of deadlift exercise with a load corresponding to 8 out of 10 on the modified Borg rated perceived exertion (RPE) scale. Body and barbell kinematics [e.g., velocity] and force production [e.g., rate of force development] variables of interest were calculated and averaged across repeated sets. Repeated-measures analyses of variance [α = 0.05] detected no significant differences [p > 0.05] for any variable. Results suggest deadlift exercise using the 5-by-5 scheme at an RPE of 8 can be performed without altered movement or force application across sets. Although these results are preliminary, it appears that deadlift exercise using the current loading scheme can be performed by resistance trained males without concern for movement or mechanical output changes across the five sets.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"41 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138587177","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
Validity and Reliability of a Linear Position Transducer to Measure Velocity, Duration, and Displacement in the Barbell Back Squat 线性位置传感器测量杠铃后蹲的速度、持续时间和位移的有效性和可靠性
International Journal of Strength and Conditioning Pub Date : 2023-11-10 DOI: 10.47206/ijsc.v3i1.249
Ryan Gant, Anthony Pinzone, Jennifer Rivera, Edward Pelka, Emily Tagesen, Modesto Lebron, Adam Jajtner
{"title":"Validity and Reliability of a Linear Position Transducer to Measure Velocity, Duration, and Displacement in the Barbell Back Squat","authors":"Ryan Gant, Anthony Pinzone, Jennifer Rivera, Edward Pelka, Emily Tagesen, Modesto Lebron, Adam Jajtner","doi":"10.47206/ijsc.v3i1.249","DOIUrl":"https://doi.org/10.47206/ijsc.v3i1.249","url":null,"abstract":"The purpose of this investigation was to determine the validity and reliability of the Humac360 linear position transducer (LPT) as compared to Tendo Weightlifting Analyzer. Seventeen recreationally active men and women completed three visits. Visit one included maximal strength assessments via one-repetition maximum (1RM) for the barbell back squat. On visits two and three, participants completed two sets of three repetitions at 30-, 50-, 60-, and 70% 1RM. Mean Concentric Velocity (MCV), Peak Velocity (PV), Displacement (D), and Duration (T) were collected. Repetition data agreement was assessed with Intraclass Correlation Coefficients (ICCs) and were categorized as poor (<0.50), moderate (0.50 – 0.75), good (0.75 – 0.90), and excellent (>0.90). Significance was accepted at an alpha (p) value < 0.05. Repetition-to-repetition comparisons between devices demonstrate varying degrees of agreement, with significant differences between devices across all intensities and all measurements (p < 0.001). Inter-set reliability was excellent for MCV, PV, D, and T with the exceptions of MCV and PV at 70% 1RM (ICC2,k = 0.548 and 0.816). Inter-session reliability data demonstrated reduced agreeableness in an intensity-dependent manner, with ICCs decreasing and SEMs increasing with increases in intensity. The Humac360 LPT does not appear to be valid when compared to the criterion reference, though we contend it maintains construct validity. Coaches may use the Humac360 LPT as a tool to monitor fatigue, and the associated changes in trainee movement velocity on an inter-set and inter-session basis.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"111 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135136790","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
Acute Effects of Ischemic Preconditioning at Different Occlusion Pressures on Athletic Performance Indicators in Male Soccer Players 不同闭塞压力下的缺血预处理对男子足球运动员运动成绩指标的急性影响
International Journal of Strength and Conditioning Pub Date : 2023-10-27 DOI: 10.47206/ijsc.v3i1.221
Alexander Montoye, Danten McFate, Benjamin Cox, Brian Rider, Jennifer Vranish
{"title":"Acute Effects of Ischemic Preconditioning at Different Occlusion Pressures on Athletic Performance Indicators in Male Soccer Players","authors":"Alexander Montoye, Danten McFate, Benjamin Cox, Brian Rider, Jennifer Vranish","doi":"10.47206/ijsc.v3i1.221","DOIUrl":"https://doi.org/10.47206/ijsc.v3i1.221","url":null,"abstract":"Ischemic preconditioning (IPC) has been shown to improve exercise performance, but many factors related to IPC administration are unresolved. This study evaluated the effect of IPC performed with different pressures for exercise performance. Fifteen collegiate male soccer players completed five separate sessions in randomized order. For each session, blood pressure cuffs were placed on the thigh bilaterally, and IPC was administered in 2x5 minute cycles at cuff pressures of 0%, 25%, 50%, 75%, or 100% of each participant’s limb occlusion pressure (LOP), the pressure needed to occlude arterial flow of blood to the leg. Participants then completed vertical jump, soccer passing accuracy, and 1,600 meter run tests. Repeated-measures analysis of variance was used to assess differences in outcomes across the five trials. There were no significant differences in vertical jump or passing accuracy across the five trials. However, 1,600 meter run times were significantly faster for the 50-75% trials than the 0-25% trials (mean difference 7.1-8.4 seconds). In summary, IPC pressures below LOP improved running times while not negatively influencing jumping or passing accuracy in collegiate soccer players. Improved comfort and reduced risk from using cuff pressures below LOP may facilitate more effective IPC use in field-based settings.","PeriodicalId":170948,"journal":{"name":"International Journal of Strength and Conditioning","volume":"13 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136235721","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}
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