Journal of Strength and Conditioning Research最新文献

{"title":"Effects of Different Exercise Training on Physical Fitness and Technical Skills in Handball Players. A Systematic Review.","authors":"Saddam Akbar, Soh Kim Geok, Marrium Bashir, Nasiruddin Nasnoor Jazaily Bin Mohd, Shengyao Luo, Sun He","doi":"10.1519/JSC.0000000000004908","DOIUrl":"10.1519/JSC.0000000000004908","url":null,"abstract":"<p><strong>Abstract: </strong>Akbar, S, Kim Geok, S, Bashir, M, Jazaily Bin Mohd, NN, Luo, S, and He, S. Effects of different exercise training on physical fitness and technical skills in handball players. A systematic review. J Strength Cond Res 38(11): e695-e705, 2024-This review aimed to assess the effects of exercise training on handball players' performance. A thorough search was conducted in 5 online databases (ProQuest, PubMed, Science Direct, Web of Science, and EBSCOhost (SPORTDiscus), as well as on Google Scholar and other gray literature references starting on April 11, 2022. The methodological quality of the included research was evaluated using the Physiotherapy Evidence Database scale. This systematic review includes 16 studies. Eight studies received \"excellent\" ratings (≥6 points), 5 received \"good\" ratings (5 points), and 3 received \"moderate\" ratings (4 points). The findings showed that the most frequently examined performance factors in exercise training intervention strategies with handball players were balance ( n = 5), agility ( n = 8), speed ( n = 9), and jumping performance ( n = 10). Muscular strength ( n = 4), shooting and dribbling skill ( n = 3), and muscular endurance ( n = 4) were the second most frequently investigated performance factors. Regarding speed and agility, exercise training considerably improved the physical fitness of handball players. However, evidence related to muscular strength, shooting ability, and dribbling skills was limited. To achieve the optimum standard, handball players must have strong physical and physiological qualities. Meanwhile, no evidence was found related to the impacts of exercise training on power, endurance, flexibility, body composition, cardiovascular fitness, and cardiorespiratory fitness. Regarding limitations, there is a need for more research with solid evidence to determine the impacts of exercise training interventions on athletes' performance in handball.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e695-e705"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142036067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Plyometric Training on Running Biomechanics and Jumping Ability of U14 Athletes.","authors":"Silvia Cardiel-Sánchez, Alberto Rubio-Peirotén, Alejandro Molina-Molina, Carlos García-Cebadera Gómez, Alejandro Almenar-Arasanz, Andrés Ráfales-Perucha, Luis E Roche-Seruendo, Antonio Cartón-Llorente","doi":"10.1519/JSC.0000000000004886","DOIUrl":"10.1519/JSC.0000000000004886","url":null,"abstract":"<p><strong>Abstract: </strong>Cardiel-Sánchez, S, Rubio-Peirotén, A, Molina-Molina, A, García-Cebadera Gómez, C, Almenar-Arasanz, A, Ráfales-Perucha, A, Roche-Seruendo, LE, and Cartón-Llorente, A. Effects of plyometric training on running biomechanics and jumping ability of U14 athletes. J Strength Cond Res 38(11): e656-e663, 2024-Children under the age of 14 years (U14) are particularly susceptible to musculoskeletal disorders because of growth spurts. Plyometric training has been shown to be beneficial for both injury reduction and performance enhancement. The aim of this study was to evaluate the effects of plyometric training on the jumping ability and running biomechanics of U14 track-and-field athletes. A single-blind randomized controlled trial was conducted. Thirty-five (18 female and 17 male) U14 athletes (age: 12.5 ± 1.2 years; height: 152.3 ± 7.7 cm; body mass: 47.3 ± 6.9 kg) were randomized into experimental and control groups. All subjects completed their usual training for 4 weeks, and those in the intervention group added a low-volume plyometric program twice a week. Preintervention and postintervention assessments included a countermovement jump (CMJ) to determine maximum jump height, 10-second repeated jumps to assess reactive strength index (RSI), and a 3-minute run at 12 km·h -1 to analyze running kinematics contact time, flight time, step length (SL), step frequency (SF), mean power output, vertical spring stiffness, and leg spring stiffness (LSS). The results revealed no main effect of time for any of the variables. A group-by-time interaction was found for RSI ( p = 0.045) in the intervention group, whereas a significant increase in LSS was also found after the intervention ( p = 0.031). However, no changes in CMJ height or other running parameters were observed. The significance level for the study was set at ρ ≤ 0.05. Plyometric-jump training may improve the stretch-shortening cycle in U14 athletes by increasing RSI and LSS. Athletes and coaches in running-related sports should be aware of these short-term effects when aiming to optimize the energy storage and release mechanism.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e656-e663"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142044001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effects of Cold Exposure, Hypoxia, and Fatigue on Pistol Marksmanship and Target Engagement Decision Making in Trained Marksmen.","authors":"Matt D Segovia, Owen F Salmon, Cierra B Ugale, Cory M Smith","doi":"10.1519/JSC.0000000000004901","DOIUrl":"10.1519/JSC.0000000000004901","url":null,"abstract":"<p><strong>Abstract: </strong>Segovia, M, Salmon, OF, Ugale, C, and Smith, CM. The effects of cold exposure, hypoxia, and fatigue on pistol marksmanship and target engagement decision making in trained marksmen. J Strength Cond Res 38(11): e686-e694, 2024-This study aimed to examine the effects of cold exposure, hypoxia, and fatigue on pistol marksmanship and target engagement in trained marksmen. Twelve healthy subjects (mean ± SD age: 28.8 ± 4.0 years) performed 3 testing visits under normal/normoxic [Norm 21 ] (24° C; 21% FiO 2 ), cold/normoxic [Cold 21 ] (10° C; 21% FiO 2 ), and cold/hypoxic [Cold 14 ] (10° C; FiO 2 : 14.3) conditions. Pistol marksmanship and target engagement were assessed through draw time (DT) and shoot-no-shoot (SNS) courses of fire. The 2 protocols were performed before (T preF ) and immediately after (T postF ) a sandbag deadlift fatiguing protocol. Significance was set at p < 0.05. Significant condition × time interactions ( p = 0.01-0.03) were found for accuracy SNS (SNS acc ), misses SNS (SNS miss ), and total shots SNS (SNS tot ). Follow-up analyses indicated that SNS acc increased by 14.3% ( p = 0.03), SNS miss decreased by 34.7% ( p = 0.02), and SNS tot decreased by 10.6% ( p = 0.04) from T preF to T postF during the Cold 21 condition alone. No significance was found for these in the Norm 21 ( p = 0.08-0.22) or Cold 14 ( p = 0.18-0.47) conditions. Total time (SNS T ) to completion of the SNS ( p = 0.09) and DT ( p = 0.14) showed no significance across time or condition. Significant difference across time for Cold 14 ( p = 0.03-0.02) for reaction time was found. Exercise likely resulted in increased thermogenesis that improved tactically relevant motor skills including SNS acc , decreased SNS miss , and SNS tot in Cold 21 , but not Cold 14 . The additive effect of hypoxia coupled with exercise in the Cold 14 condition did not improve tactical performance, suggesting multi-stressor environments result in competing physiological responses. Tactical strength and conditioning specialists as well as operators should aim to improve thermoregulation during Cold 21 conditions, with exercise as a possible intervention.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e686-e694"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142044018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Immediate Effects of a Standardized Kettlebell Swing Protocol on Lumbar Paraspinal Muscle Function: A Randomized Controlled Trial.","authors":"William J Hanney, Andrew Perez, Gabriel Collado, Alison C Palmer, Abigail T Wilson, Randi M Richardson, Morey J Kolber","doi":"10.1519/JSC.0000000000004892","DOIUrl":"10.1519/JSC.0000000000004892","url":null,"abstract":"<p><strong>Abstract: </strong>Hanney, WJ, Perez, A, Collado, G, Palmer, AC, Wilson, AT, Richardson, RM, and Kolber, MJ. J Strength Cond Res 38(11): 1854-1859, 2024-Kettlebell swings (KBSs) are commonly used to target the lumbar erector spinae and lower body musculature. This exercise exhibits distinct loading properties that requires cyclical contraction of the trunk extensors and posterior chain, potentially explaining its novel influence on muscle contractility. Tensiomyography (TMG) is a reliable, noninvasive, passive technique that may be used to examine muscular fatigue produced by exercises such as KBSs. The purpose of this randomized control trial was to determine the extent of muscle fatigue in the lumbar erector spinae musculature following the performance of a previously published high-intensity interval KBS protocol. Forty-one adults between the ages of 18 and 45 years were recruited. Inclusion criteria included subjects with no recent history of low back pain and clearance by the physical activity readiness questionnaire. Subjects were randomly allocated to either a KBS group ( n = 21) or a control group (CON; n = 20) who only performed the unloaded warm-up. Subjects were assessed at baseline, postintervention, and 24-hours postintervention for bilateral erector spinae fatigue, measured by 5 TMG parameters (Dm, Tc, Tr, Td, and Ts). The results were evaluated through a 2 × 3 (group × time) repeated-measures analysis of variance. The level of significance was set at p ≤ 0.05. There was no significant difference in lumbar erector spinae fatigue, measured by the 5 TMG parameters ( p ≥ 0.079), following the interval KBS protocol in comparison with the CON group at 3 assessment periods. A high-intensity interval KBS protocol failed to produce significant differences in erector spinae fatigue compared with the control group that did not perform a KBS. These findings warrant further investigation into muscle fatigue produced with higher intensity protocols and possibly suggest, depending on the programming goals, the need for an alternate KBS training parameters.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"1854-1859"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142044021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of Health and Safety Resources for Athletes With Sickle Cell Trait at NCAA Institutions.","authors":"Susan W Yeargin, Courtney M Meyer, Rebecca M Hirschhorn, Abbi D Lane, Shawn M Arent, Clint R Haggard","doi":"10.1519/JSC.0000000000004899","DOIUrl":"10.1519/JSC.0000000000004899","url":null,"abstract":"<p><strong>Abstract: </strong>Yeargin, SW, Meyer, CM, Hirschhorn, RM, Lane, AD, Arent, SM, and Haggard, CR. Characterization of health and safety resources for athletes with sickle cell trait at NCAA institutions. J Strength Cond Res 38(11): 1967-1973, 2024-The purpose of this study was to report the prevalence of student-athletes with sickle cell trait (SCT), determine which screening practices are most commonly used, describe the health and human performance services provided to athletes, and ascertain if differences between National Collegiate Athletic Association (NCAA) designations or divisions exist. A cross-sectional survey design was used to query healthcare administrators regarding SCT resources at their institution. The independent variables were designation (historically Black colleges or universities [HBCUs] or non-HBCU) and Division (DI, DII, and DIII). The dependent variables were SCT prevalence, and the health and human performance services provided to athletes. Of the 60 respondents, HBCU ( n = 16) reported 4.9 ± 2.7% of athletes with SCT, which was higher than non-HBCU (1.1 ± 0.8%; p = 0.022). Historically Black colleges or university reported a higher percentage of student-athletes supplying their own screening results than non-HBCU (52.5 ± 39.2 vs. 12.9 ± 24.0%; p = 0.022). Division III reported higher proportions of waivers than DI (68.3 ± 38.4 vs. 16.9 ± 31.0%; p = 0.010). Most schools ( n = 42, 70.0%) reported having policy and procedures regarding exertional sickling, but none ( n = 60, 100.0%) involved strength and conditioning coaches (SCCs) during development. Practically, a greater proportion of DII and DIII institutions do not have supplemental oxygen available compared with DI but not statistically ( p = 0.058). Pragmatically, the prevalence should be considered when ordering and preparing resources annually. NCAA institutions need to create policy and procedure sections beyond screening. Athletic trainers and SCCs need to have a strong collaborative relationship to optimize health and human performance services.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"1967-1973"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11498838/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141788456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sex Differences in Physiological Responses to a National Collegiate Athletic Association Division I Soccer Season.","authors":"Bridget A McFadden, Alan J Walker, Harry P Cintineo, Brittany N Bozzini, David J Sanders, Alexa J Chandler, Shawn M Arent","doi":"10.1519/JSC.0000000000004882","DOIUrl":"10.1519/JSC.0000000000004882","url":null,"abstract":"<p><strong>Abstract: </strong>McFadden, BA, Walker, AJ, Cintineo, HP, Bozzini, BN, Sanders, DJ, Chandler, AJ, and Arent, SM. Sex differences in physiological responses to a National Collegiate Athletic Association Division I soccer season. J Strength Cond Res 38(11): 1891-1899, 2024-Identifying physiological changes that occur in response to workload demands can help to elucidate athlete management and recovery strategies. The purpose of this study was to compare the physical and physiological demands between men and women throughout the course of a collegiate soccer season. Men ( N = 23) and women ( N = 26) soccer players participated in blood draws before preseason (T1) and every 4 weeks thereafter (T2-T4). Workload was determined at all practices and games via heart rate and global positioning satellite monitoring systems. Repeated measures multivariate analysis of variance and linear mixed models were used to assess workload and biomarker responses throughout the season ( p < 0.05). Both teams experienced the highest workloads during the first 4 weeks of the season ( p < 0.05), which was followed by several biomarker perturbations. Sex-by-Time interactions were observed for total cortisol, growth hormone, insulin-like growth factor-1, thyroxine, thyroid-stimulating hormone, vitamin D, and omega 3 fatty acid index ( p < 0.05). Additional Sex effects were observed for free and total testosterone, estrogen, prolactin, sex-hormone binding globulin, creatine kinase, and iron levels ( p < 0.05). Women soccer players experienced further Time effects for free cortisol, iron, ferritin, and percent transferrin saturation ( p < 0.05). Male soccer players experienced additional Time effects for total testosterone, estrogen, creatine kinase, interleukin-6, triiodothyronine, and ferritin ( p < 0.05). Despite similar patterns of change in workloads, differential fluctuations in physiological markers were observed between the sexes. Understanding sex differences in response to comparable workloads may enhance exercise prescriptions for better athlete management plans. Additional strategies to increase iron may be warranted in female athletes.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"1891-1899"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141792763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accentuated Eccentric Loading and Alternative Set Structures: A Narrative Review for Potential Synergies in Resistance Training.","authors":"Sungwon Chae, Kurt W McDowell, Marten L Baur, S Alexander Long, James J Tufano, Michael H Stone","doi":"10.1519/JSC.0000000000004942","DOIUrl":"10.1519/JSC.0000000000004942","url":null,"abstract":"<p><strong>Abstract: </strong>Chae, S, McDowell, KW, Baur, ML, Long, SA, Tufano, JJ, and Stone, MH. Accentuated eccentric loading and alternative set structures: A narrative review for potential synergies in resistance training. J Strength Cond Res 38(11): 1987-2000, 2024-As athletes become adapted to training over time, it becomes more difficult to develop their strength and power. In a conventional resistance training strategy, volume or load may be increased to provide novel stimuli to break through a plateau. However, physiological stress markers increase with increased volume or load, which is an innate shortcoming. In that case, practitioners strive to develop unconventional strategies that could increase training stimuli while adjusting fatigue. Two programming tactics, accentuated eccentric loading (AEL) using eccentric overload and alternative set structures (AS) using intraset rests, have been reported to increase training stimuli and alleviate fatigue, respectively. Importantly, when merging AEL and AS in various contexts, the 2 benefits could be accomplished together. Because AEL and AS cause different outcomes, it is important to deal with when and how they may be integrated into periodization. Moreover, prescribing eccentric overload and intraset rests requires logistical considerations that need to be addressed. This review discusses the scientific and practical aspects of AEL and AS to further optimize strength and power adaptations. This review discusses (a) scientific evidence as to which tactic is effective for a certain block, (b) potential practical applications, and (c) related discussions and future research directions.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"1987-2000"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142289845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long Duration Load Carriage Performance Is Associated With Army Combat Fitness Test Scores and Fat-Free Mass.","authors":"Megan Sax van der Weyden, Justin J Merrigan, Joel Martin","doi":"10.1519/JSC.0000000000004903","DOIUrl":"https://doi.org/10.1519/JSC.0000000000004903","url":null,"abstract":"<p><strong>Abstract: </strong>Sax van der Weyden, M, Merrigan, JJ, and Martin, J. Long duration load carriage performance is associated with Army Combat Fitness Test scores and fat free mass. J Strength Cond Res 38(11): 1959-1966, 2024-A common occupational task for the military is carrying heavy loads for long periods of time. The US Army has set a time standard of 3 hours to complete a 19.31-km march with a 15.9-kg ruck sack for combat arms training and specialty schools. The purpose of this study was to identify characteristics associated with 19.31-km foot march completion rates in Reserve Officers' Training Corps (ROTC) Cadets. Demographics, anthropometrics/body composition, Army Combat Fitness Test (ACFT) scores, and vertical countermovement jump (CMJ) data were collected on 65 ROTC cadets who conducted a 19.31-km foot march. Independent t tests and Mann-Whitney U tests compared variables between those who did and did not finish the foot march in less than 3 hours. Logistic regressions were used to calculate the odds of completing the foot march using military experience, fat-free mass, ACFT, and CMJ outcomes. Cadets who met the 3 hours standard had lower body fat percent, greater fat-free mass, higher ACFT scores, and higher CMJs than those who did not. In addition, for every one point increase in ACFT score and 1-kg increase in fat-free mass, a cadet's chances of finishing the foot march increased by 6.1 and 24%, respectively. When analyzing ACFT events separately, 2-mile run was the only significant variable, and for every 1 point increase in 2-mile run score, a cadet's chances of finishing the foot march increased by 9%. Thus, aspiring and current soldiers should train to improve aerobic fitness and build muscle mass in preparation for load carriage requirements.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":"38 11","pages":"1959-1966"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute Effects of Intracontrast Rest After Back Squats on Vertical Jump Performance During Complex Training.","authors":"Liam J Houlton, Jeremy A Moody, Theodoros M Bampouras, Joseph I Esformes","doi":"10.1519/JSC.0000000000004878","DOIUrl":"10.1519/JSC.0000000000004878","url":null,"abstract":"<p><strong>Abstract: </strong>Houlton, LJ, Moody, JA, Bampouras, TM, and Esformes, JI. Acute effects of intracomplex rest after back squats on vertical jump performance during complex training. J Strength Cond Res 38(11): e645-e655, 2024-Postactivation performance enhancement and complex-contrast sets are prevalent in sports science research. Typical complex-contrast sets consist of heavy back squats, an intracontrast rest period (ICRP) and vertical jumps (countermovement jumps [CMJs], or squat jumps [SJs]). Propulsive impulse (J prop ) is considered the leading indicator of jump performance. However, studies evaluating jump performance during complex-contrast sets use jump height as the primary performance measure, limiting insight into ICRP's effect on jump performance. We assessed the effect of a 3 repetition maximum (3RM) back squat and 6 ICRPs on vertical jump J prop and associated force-time components. Fourteen subjects completed 12 experimental conditions, assigned equally to 4 testing sessions. Independent variables, in a 6 × 2 randomized, counterbalanced design, were ICRP (0, 60, 120, 180, 240, 300 seconds; ICRP0, ICRP60, ICRP120, ICRP180, ICRP240, ICRP300, respectively) and vertical jump (CMJ and SJ). Conditions consisted of baseline vertical jumps, followed by 3 back squat repetitions at 100% 3RM, an ICRP and experimental jumps. Symmetrized percentage changes between experimental and baseline jumps were assessed using repeated measures analysis of variance (ANOVA) and pairwise effect sizes. Results showed significant effects ( p ≤ 0.05) on CMJ average rate of force development (RFD) between ICRP0 and ICRP120 and ICRP0 and ICRP300. Pairwise comparisons showed medium and large effect sizes for and increases in CMJ RFD ( g = 0.83-2.69) whereas SJ RFD decreased ( g = 0.81-2.57). Small effect sizes were found for J prop , peak force, and mean force. Results suggest limited change in J prop ( g = 0.01-0.58), but back squats may potentiate RFD via the stretch-shortening cycle.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e645-e655"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141627051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute Effects of Foam Rolling vs. Vibration Foam Rolling on Blood Flow Parameters in Professional Soccer Players: A Randomized Crossover Design.","authors":"Alexis Padrón-Cabo, Alejandra Alonso-Calvete, Łukasz Radzimiński, Ezequiel Rey, Miguel Lorenzo-Martínez","doi":"10.1519/JSC.0000000000004896","DOIUrl":"10.1519/JSC.0000000000004896","url":null,"abstract":"<p><strong>Abstract: </strong>Padrón-Cabo, A, Alonso-Calvete, A, Radzimiński, Ł, Rey, E, and Lorenzo-Martínez, M. Acute Effects of foam rolling vs. vibration foam rolling on blood flow parameters in professional soccer players: a randomized crossover design. J Strength Cond Res 38(11): 1885-1890, 2024-The study aimed to compare the effects of foam roller (FR) and vibration foam roller (VFR) on blood flow parameters, measured by Doppler ultrasonography in professional soccer players. A randomized crossover design was used, and 10 professional soccer players participated in 3 experimental sessions: FR, VFR, and a control condition (CC). The maximum velocity (MVel) and maximum volume (MVol) blood flow parameters were measured in the common femoral artery of the dominant leg at 5 different time points as follows: before (pre), immediately after (post 0'), 10 (post 10'), 20 (post 20'), and 30 minutes (post 30') after the intervention. Both FR and VFR involved two 45-second sets with 15-second rest between sets in the quadriceps and hamstring, while CC required sitting for 240 seconds. The FR condition showed a significant increase in MVel ( p < 0.01) at all time points after the intervention, and an increase in MVol ( p < 0.05) only at post 0' compared with pre. The VFR condition showed a significant ( p < 0.05) increase in MVel at post 0' and post 10' and an increase ( p < 0.05) in MVol at post 0' compared with pre. In comparison with CC, the FR and VFR conditions presented significantly ( p < 0.05) higher MVel values at post 0', post 10', post 20', and post 30' than CC. For both FR and VFR conditions, the MVol not only revealed a significant ( p < 0.05) increase at post 0' but also at post 10' for VFR compared with CC. In summary, the FR and VFR interventions demonstrated a similar increase in blood flow parameters, suggesting that both strategies may accelerate physiological recovery in elite soccer players.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"1885-1890"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142043984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}