Journal of Strength and Conditioning Research最新文献

{"title":"A Comparison of Maximal Push-Up and Bench Press Performance and Their Prediction Based on Load-Velocity Relationships.","authors":"Roland van den Tillaar, Hallvard N Falch, Stian Larsen","doi":"10.1519/JSC.0000000000005160","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005160","url":null,"abstract":"<p><strong>Abstract: </strong>van den Tillaar, R, Falch, HN, and Larsen, S. A comparison of maximal push-up and bench press performance and their prediction based on load-velocity relationships. J Strength Cond Res XX(X): 000-000, 2025-This study aimed to compare maximal push-up and bench press performance, and their prediction based on the load-velocity relationships. Eleven resistance-trained men (age 25.3 ± 4.0 years, body mass 84.2 ± 6.1 kg, and body height 1.80 ± 0.06 m) performed push-ups and bench presses with 4 different loads randomly. Push-ups were performed with and without a 10-20-30 kg weight vest. Bench press was performed with similar weights as in the push-ups, followed by finding 1RM in each exercise. A linear encoder measured barbell and push-up velocities during the exercises, and force plates were used to measure the average force on the arms during the push-ups. A load-velocity relationship was established between the load and velocity for the push-up and bench press per subject and the equation used to establish a predicted 1RM. The main findings of this study demonstrate that 1RM for push-ups was significantly higher than with bench press (112.4 ± 18.9 vs. 106.4 ± 20.4 kg); meanwhile, there were no differences in the predicted 1RM. Furthermore, an extremely strong association was observed between the actual 1RM loads performed with the push-up and bench press (r = 0.92). Even with different load-velocity relationships for the 2 exercises, it was possible to predict a cross-over 1RM between them, which was not significantly different from the actual 1RM loads. For coaches and athletes, this method is an easy, cost, and time-effective option for standard 1RM bench press testing to predict maximal upper body strength.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144258223","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":"Change of Direction Density: A Novel Consideration of Consecutive Changes of Direction in Elite Youth Soccer.","authors":"Oliver J Morgan, Barry Drust, Jack David Ade, Mark A Robinson","doi":"10.1519/JSC.0000000000005145","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005145","url":null,"abstract":"<p><strong>Abstract: </strong>Morgan, OJ, Drust, B, Ade, JD, and Robinson, MA. Change of direction density: A novel consideration of consecutive changes of direction in elite youth soccer. J Strength Cond Res XX(X): 000-000, 2025-This study aimed to characterize change of directions (CODs) based on density (number of CODs within 10 seconds), locomotor activity (walk, jog, stride, and sprint), and movement direction pre- and post-COD (forwards, sideways, and backwards), relative to playing position. In total, 24 elite male English Premier League academy soccer players (mean ± SD; age: 19.0 ± 1.9 years, height: 179.9 ± 7.0 cm and body mass: 71.9 ± 6.4 kg) were individually filmed during 10 competitive matches. In total, 7,399 CODs were observed. Level of significance was p ≤ 0.05. An average of 84 ± 23 multiple COD events per player, per game occurred with no significant difference between position. Six CODs within 10 seconds were the average maximum density across positions (1.4 ± 1.2), with 9 CODs within 10 seconds being the maximum observed. Overall, 94% of multiple COD events were 2, 3, and 4 CODs within 10 seconds collectively, and were each performed significantly more than all other density categories (5-9 CODs in 10 seconds) (p < 0.001). Jogging and striding pre- and post-COD were the most common locomotor activities (p < 0.05). Change of directions were rarely surrounded by sprinting (1.4 ± 1.4) with <1% of total CODs with a sprint (pre and post) with approximately half of CODs (53%) occurring in a forward movement pre- and post-COD. Change of directions seem to be performed as multiple events, in multiple directions, at mostly submaximal locomotor activities, with some positional differences for movement direction and locomotor activity pre- and post-COD. These data provide valuable guidance for practitioners for testing, conditioning, and rehabilitating soccer players.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144258225","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 Nordic Hamstring Exercise Set Configuration on Eccentric Hamstring Strength Changes in Youth Female Athletes.","authors":"Thibaut Bounias, Greg Henry, Ramnath Goswami, Jason Moran, David G Behm, Benjamin Drury","doi":"10.1519/JSC.0000000000005139","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005139","url":null,"abstract":"<p><strong>Abstract: </strong>Bounias, T, Henry, G, Goswami, R, Moran, J, Behm, DG, and Drury, B. Effects of Nordic hamstring exercise set configuration on eccentric hamstring strength changes in youth female athletes. J Strength Cond Res XX(X): 000-000, 2025-Anterior cruciate ligament injury poses a significant risk in youth female athletes. The Nordic hamstring exercise (NHE) can improve eccentric hamstring strength (EHS), a key factor related to anterior cruciate ligament injury risk, yet limited research exists in this population. This study compared 2 NHE set configurations-traditional sets (TS) and rest redistribution (RR)-on EHS in youth female athletes. Subjects (age: 13.93 ± 1.58 years; body mass: 48.95 kg ± 11.15 kg; percentage of predicted adult height: 96.50% ± 4.30%) were randomly assigned to TS (n = 17) or RR (n = 18) groups. Both groups performed a 6-week NHE program, increasing weekly volume from 6 to 18 repetitions. Pretests and post-tests assessed EHS changes using the NordBord and isokinetic testing at 60°·s-1 and 180°·s-1, assessing peak torque (PT), angle of peak torque (°PT), and torque at 20°, 40°, 60°, and 80° of knee flexion. Both TS and RR significantly increased NordBord EHS (g = 0.34-0.98). Isokinetic data at 60°·s-1 and 180°·s-1 revealed significant small increases in PT and torque at 40°, 60°, and 80° (g = 0.22-0.46). Yet, no changes were observed in torque at 20° (g = 0.01-0.23) and the °PT increased (g = 0.33-0.83). No between-group differences were observed for any measure. These findings suggest that TS or RR set configurations can effectively enhance EHS in youth female athletes. However, to target EHS at longer muscle lengths, practitioners should include additional exercises beyond the NHE.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144258226","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":"Sleep Duration and Sleep Quality as Season-Long Predictors of Ratings of Perceived Exertion and Psychological Well-Being in Female Soccer Athletes.","authors":"John William Long, Matthew Gonzalez, John Farrell, Maria Elena Carmargo, Kelly Cheever","doi":"10.1519/JSC.0000000000005166","DOIUrl":"10.1519/JSC.0000000000005166","url":null,"abstract":"<p><strong>Abstract: </strong>Long, JW, Gonzalez, M, Farrell, J, Carmargo, ME, and Cheever, K. Sleep duration and sleep quality as season-long predictors of ratings of perceived exertion and psychological well-being in female soccer athletes. J Strength Cond Res XX(X): 000-000, 2025-Sleep's effect on physiologic and psychological well-being has been examined through cross-sectional studies, but research is limited on the longitudinal impact sleep has on well-being in collegiate athletes. Thus, the purpose of this study was to explore daily fluctuations in subjective measures of psychological wellness and physiologic stress (soreness, rating of perceived exertion [RPE]) across a competitive soccer season, and the extent to which sleep duration and quality modify daily measures of wellness. Twenty female collegiate soccer players underwent daily measures of psychological well-being (mental stress, mental fatigue, anxiety, and depression), physical stress (active time, total distance, GPS load, soreness, and RPE), and sleep (duration and quality) across a 120-day competitive season. Generalized linear mixed-effects models with a zero-inflation component were used to examine the effects of sleep duration and quality on measures of physiologic and psychological stress. Sleep duration was a predictor of RPE and anxiety, and there was an interaction between sleep duration and the day of the soccer season affecting RPE, anxiety, and soreness ( p < 0.05). Sleep quality was a predictor of anxiety, mental stress, and RPE ( p < 0.05). Significant interactions were observed between sleep quality and the day of the soccer season affecting soreness, anxiety, mental fatigue, and mental stress (all p < 0.05). Findings suggest sleep duration and sleep quality are protective of measures of psychological well-being, with increasingly protective effects across a competitive soccer season. These findings have utility in helping to maximize both student athlete performance and wellness.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144266491","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":"Neuromuscular Profiles of Female Collegiate Athletes: Variations in Countermovement Jump Metrics Across 8 NCAA Division I Sports.","authors":"William J Kraemer, Emaly A Vatne, Catherine Saenz, Paul C Jones, Tyler J Carpenter, Daniel A Cencer, Kevin E Enchelmeyer, Kyle R Pulvermacher, Clare K Quebedeaux, Matthew R Vatne, Joshua A Hagen","doi":"10.1519/JSC.0000000000005170","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005170","url":null,"abstract":"<p><strong>Abstract: </strong>Kraemer, WJ, Vatne, EA, Saenz, C, Jones, PC, Carpenter, TJ, Cencer, DA Jr, Enchelmeyer, KE, Pulvermacher, KR, Quebedeaux, CK, Vatne, MR, and Hagen, JA. Neuromuscular profiles of female collegiate athletes: variations in countermovement jump metrics across 8 NCAA Division I sports. J Strength Cond Res XX(X): 000-000, 2025-This study investigated countermovement jump (CMJ) performance metrics among National Collegiate Athletic Association Division I female athletes in 8 sports. The purpose of this study was to assess sport-specific variations in CMJ metrics to inform targeted training. A total of 169 athletes from basketball, field hockey, gymnastics, ice hockey, lacrosse, soccer, swimming, and volleyball were included. Athletes completed 3 CMJ trials with metrics recorded from the best trial, including jump height, average and peak propulsive power, modified reactive strength index, relative peak braking power, and relative peak landing force. Data were analyzed using 1-way analysis of variance with significance at p ≤ 0.05. Significant differences were observed across sports. Ice hockey athletes showed significantly higher jump height, peak propulsive power, and relative braking power compared with athletes in lacrosse, swimming, and field hockey. Findings suggest that athletes in explosive sports like ice hockey demonstrate superior CMJ performance, potentially due to high demands for rapid acceleration and deceleration in competition. These results can guide strength and conditioning coaches to tailor training programs to the specific neuromuscular demands of each sport, enhancing performance and reducing injury risks.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144266489","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":"Handgrip Strength Associated With Leg Strength, Power, and Muscle Mass in 18-64-Year-Old Males and Females.","authors":"Jeffrey M McBride, Emily C Bauer, Noah C Kaufmann, N Travis Triplett, R Andrew Shanely","doi":"10.1519/JSC.0000000000005089","DOIUrl":"10.1519/JSC.0000000000005089","url":null,"abstract":"<p><strong>Abstract: </strong>McBride, JM, Bauer, EC, Kaufmann, NC, Triplett, NT, and Shanely, RA. Handgrip strength associated with leg strength, power, and muscle mass in 18-64-year-old males and females. J Strength Cond Res 39(6): 642-648, 2025-The purpose of this investigation was to determine the association between handgrip strength (HGS) and measures of leg strength, power, and muscle mass. Twenty-one men (age = 32.9 ± 11.4 years, height = 175.7 ± 8.3 cm, body mass = 83.6 ± 14.4 kg, body fat = 22.6 ± 6.2%) and 24 women (age = 35.5 ± 14.0 years, height = 164.6 ± 6.8 cm, body mass = 65.2 ± 8.6 kg, body fat = 30.0 ± 5.7%) performed a HGS test, a squat and leg press 1 repetition maximum (1RM), a countermovement jump (CMJ) on a force plate, and a dominant leg peripheral quantitative computed tomography thigh scan to calculate muscle cross-section area (CSA). Lean body mass was determined through dual x-ray absorptiometry. Jump height and impulse were calculated from force time curves from the CMJ as a representation of leg muscular power. Strong statistically significant correlations were found between HGS and squat 1RM ( r = 0.80, p ≤ 0.0001), leg press 1RM ( r = 0.79, p ≤ 0.0001), CMJ height ( r = 0.78, p ≤ 0.0001), CMJ impulse ( r = 0.84, p ≤ 0.0001), and thigh muscle CSA ( r = 0.75, p ≤ 0.0001 and lean body mass ( r = 0.79, p ≤ 0.0001). This study indicates that HGS could be used as a preliminary screening tool for determination of leg strength, power, and muscle mass. These variables have been determined to be components to overall fitness that increase quality of life and overall health. Thus, health care providers may be able to use this simple test as an early indication of possible risk factors for poor health and well-being.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"642-648"},"PeriodicalIF":2.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143968905","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":"Iron Supplementation After Blood Donation Expedites Hematological Recovery but Does Not Influence Exercise Performance.","authors":"Tyler B Judd, Keely A Shaw, Joel R Krentz, Philip D Chilibeck","doi":"10.1519/JSC.0000000000005082","DOIUrl":"10.1519/JSC.0000000000005082","url":null,"abstract":"<p><strong>Abstract: </strong>Judd, TB, Shaw, KA, Krentz, JR, and Chilibeck, PD. Iron supplementation after blood donation expedites hematological recovery but does not influence exercise performance. J Strength Cond Res 39(6): 660-665, 2025-While the impact of blood donation on hemoglobin and exercise performance and the timeline for recovery is well studied, the role of iron supplementation in expediting recovery of performance is unknown. The objective of this research was to assess the effectiveness of oral iron supplementation in enhancing recovery of hemoglobin, hematocrit, and exercise performance after blood donation. Hemoglobin, hematocrit, and 5-km time trial performance were assessed in 10 moderately active subjects (6 men, 4 women; age = 34.0 ± 7.6 years, body mass = 74.4 ± 12.5 kg, V̇ o2 peak = 50.5 ± 6.0 ml·kg -1 ·min -1 ) before blood donation, the day after, and at weekly intervals for 5 weeks after donation. Before donation, individuals were stratified by sex and randomly assigned to supplement with 60 mg of elemental iron (3 men, 2 women) or placebo (3 men, 2 women) for 5 weeks. Significance was as accepted at p < 0.05. Time trial performance was decreased the day after donation by 6.7% ( p < 0.001) and returned to baseline levels by 1 week after blood donation with no difference between groups. Hemoglobin concentration decreased by 1.6 g·dl -1 after blood donation ( p < 0.01) with no difference between groups and failed to return to baseline after 5 weeks in either group. Hematocrit decreased by 4.0 and 3.1% in the iron and placebo groups, respectively, the day after donation compared with baseline ( p < 0.001). By week 4, hematocrit in the iron group was no longer different from baseline ( p = 1.0) but did not return to baseline values by week 5 in those supplementing with placebo ( p < 0.05). Iron supplementation may enhance hematological recovery after blood donation but does not influence recovery of endurance performance.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"660-665"},"PeriodicalIF":2.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605296","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 a Sleep Hygiene Intervention Period on the Internal and External, Inter- and Intra-match Demands of Male University-Level Soccer Players During a Tournament.","authors":"Michael Prevoo, Adéle Broodryk, Mark Kramer","doi":"10.1519/JSC.0000000000005083","DOIUrl":"10.1519/JSC.0000000000005083","url":null,"abstract":"<p><strong>Abstract: </strong>Prevoo, M, Broodryk, A, and Kramer, M. Effects of a sleep hygiene intervention period on the internal and external, inter- and intra-match demands of male university-level soccer players during a tournament. J Strength Cond Res 39(6): e798-e805, 2025-Soccer is a physiologically and psychologically demanding sport, requiring players to optimize their sleep to enhance their recovery and ensure optimal performance during a match. Therefore, this study aimed to determine the effect of a sleep hygiene intervention period (SHP) on the internal and external match demands during an 8-match tournament. Sixteen male university-level soccer players' (average age: 22.2 ± 3 years; stature: 167.6 ± 6.4 cm; mass: 62 ± 6.6 kg) movement patterns, heart rate, RPE, and sleep quality (Pittsburgh Sleep Quality Index-PSQI) were compared over an intervention period consisting of 2 matches (no-sleep hygiene period: no-SHP), 4 matches (sleep-hygiene period-SHP, adhering to 10 SHP principles over 4 weeks), and again 2 matches of no-SHP. A significantly improved global PSQI score ( p = 0.03), sleep latency ( p = 0.05), and sleep hours ( p = 0.004) were seen following the SHP. Comparing the match halves of the no-SHP and SHP, significant differences were found for total distance ( p < 0.001), distances completed while jogging ( p < 0.001), running ( p < 0.001), and sprinting ( p = 0.03), as well as distances covered in the medium ( p = 0.05) and high-velocity ( p < 0.001) zones, and low ( p < 0.001) and medium ( p < 0.001) decelerative zones and for all accelerative zones ( p < 0.001). Participants were able to surpass their work rates after the SHP with no RPE increases observed, hence demonstrating the usefulness of putting organized sleep into practice. Therefore, it is recommended that players and coaching staff implement sleep hygiene guidelines more regularly, as it may result in noteworthy performance improvements.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e798-e805"},"PeriodicalIF":2.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144041137","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":"Reliability and Validity of the Agility Test for Adults Test in Primary and Secondary School Students.","authors":"Rocío Carballo-Afonso, Daniel González-Devesa, Miguel Adriano Sanchez-Lastra, José C Diz-Gómez, Carlos Ayán-Pérez","doi":"10.1519/JSC.0000000000005086","DOIUrl":"10.1519/JSC.0000000000005086","url":null,"abstract":"<p><strong>Abstract: </strong>Carballo-Afonso, R, González-Devesa, D, Sanchez-Lastra, MA, Diz-Gómez, JC, and Ayán-Pérez, C. Reliability and validity of the agility test for adults test in primary and secondary school students. J Strength Cond Res 39(6): e758-e763, 2025-This study aimed to identify the reliability and validity of the Agility Test for Adults (ATA) among primary and secondary school students. A sample comprised 156 primary and 289 secondary students. Anthropometric variables, Agility Test for Adults, and results from the 10 × 4-m shuttle run test of all subjects were analyzed. Higher internal consistency values were observed for the Agility Test for Adults ( α : 0.82-0.88). Test-retest reliability values were fair for both the Agility Test for Adults original (intraclass correlation coefficient [ICC]: 0.733; 95% confidence interval (CI) [0.579-0.821]) and adjusted performance time (ICC: 0.754; 95% CI [0.573-0.845]). A fair significant association between both the Agility Test for Adults original (Rho = 0.46-0.48) and adjusted (Rho = 0.46-0.49) performance time and 10 × 4-m shuttle run test were found. This association were fair for primary (Rho = 0.37-0.43) and secondary students (Rho = 0.41). Agility Test for Adults demonstrated fair relative reliability, good absolute reliability, and fair convergent validity when conducted by school students. The properties of the Agility Test for Adults make it highly suitable for the early and cost-effective detection of developmental motor delays in childhood. In addition, the Agility Test for Adults can aid in the design of tailored exercise programs aimed at enhancing coordination and physical performance, which is essential for the optimal development of motor skills in children and adolescents.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e758-e763"},"PeriodicalIF":2.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144027820","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 Loaded and Unloaded Jumps Used as Priming Activities in Elite Male Rugby Union Players.","authors":"Irineu Loturco, Piotr Zmijewski, Valter P Mercer, Tulio B M A Moura, Mauricio S Ramos, Marina T Betelli, Lucas A Pereira, Michael R McGuigan","doi":"10.1519/JSC.0000000000005093","DOIUrl":"10.1519/JSC.0000000000005093","url":null,"abstract":"<p><strong>Abstract: </strong>Loturco, I, Zmijewski, P, Mercer, VP, Moura, TBMA, Ramos, MS, Betelli, MT, Pereira, LA, and McGuigan, MR. Effects of loaded and unloaded jumps used as priming activities in elite male rugby union players. J Strength Cond Res 39(6): e781-e787, 2025-This randomized crossover study examined the effects of 2 distinct priming activities on strength, speed, and power performance of elite rugby players. Twenty male rugby union players from the Brazilian National Team were tested on 3 occasions, 1 week apart, during the final phase of preparation for the \"American Rugby Super League.\" In the first session (baseline), players performed tests for countermovement jump (CMJ), drop jump (DJ), loaded jump squat (JS), sprint speed, and maximum isometric force (MIF) in the half squat (HS). In addition, to determine the loads for the priming exercises (i.e., JS and DJ), the DJ height associated with the best reactive strength index (RSI) and the 1RM in the HS were also assessed. In the following 2 weeks, both experimental protocols were implemented. After a standardized warm-up, players completed the priming activities in a randomized order, consisting of 6 × 6 DJs from the height yielding the best RSI or 6 sets of JS at 40% HS-1RM. After this, at 6-hour and 24-hour postpriming sessions, they were tested for jumping and sprinting abilities, peak velocity in the JS, and MIF in the HS. Our results showed that both exercises were effective in improving performance at different time intervals, with the JS demonstrating clear superiority over the DJ. Jump-squat peak velocity at 30 and 100% of body mass increased significantly at both time intervals across both exercises, whereas CMJ height increased only at the 6-hour testing session after the JS protocol. Sprinting speed improved significantly only after JSs, highlighting the effectiveness of this ballistic exercise in enhancing the speed performance of team-sport athletes. Coaches are encouraged to prescribe jumping exercises, especially with light loads, in periods preceding matches and competitions.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"e781-e787"},"PeriodicalIF":2.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143970939","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}