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Journal of Strength and Conditioning Research

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https://www.readbyqxmd.com/read/30399118/whole-body-vibration-as-a-warm-up-before-exercise-induced-muscle-damage-on-symptoms-of-delayed-onset-muscle-soreness-in-trained-subjects
#1
Ryan D Magoffin, Allen C Parcell, Robert D Hyldahl, Gilbert W Fellingham, J Tyson Hopkins, J Brent Feland
Magoffin, RD, Parcell, AC, Hyldahl, RD, Fellingham, GW, Hopkins, JT, and Feland, JB. Whole-body vibration as a warm-up before exercise-induced muscle damage on symptoms of delayed-onset muscle soreness in trained subjects. J Strength Cond Res XX(X): 000-000, 2018-There is no clear scientific evidence that whole-body vibration (WBV) used as a warm-up before performing eccentric exercise mitigates delayed-onset muscle soreness (DOMS) and speeds strength loss recovery. These benefits were observed primarily in nonresistance-trained individuals...
November 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30399117/comparison-of-the-fitrodyne-and-gymaware-rotary-encoders-for-quantifying-peak-and-mean-velocity-during-traditional-multijointed-exercises
#2
John F T Fernandes, Kevin L Lamb, Cain C T Clark, Jason Moran, Ben Drury, Amador Garcia-Ramos, Craig Twist
Fernandes, JFT, Lamb, KL, Clark, CCT, Moran, J, Drury, B, Garcia-Ramos, A, and Twist, C. Comparison of the FitroDyne and GymAware rotary encoders for quantifying peak and mean velocity during traditional multijointed exercises. J Strength Cond Res XX(X): 000-000, 2018-The FitroDyne and GymAware rotary encoders are being increasingly used in resistance training to monitor movement velocity, but how closely their velocity outcomes agree is unknown. Consequently, this study aimed to determine the level of agreement between the FitroDyne and GymAware for the assessment of movement velocity in 3 resistance training exercises...
November 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30399116/acute-effect-of-popular-high-intensity-functional-training-exercise-on-physiologic-markers-of-growth
#3
Brian Kliszczewicz, Chad D Markert, Emily Bechke, Cassie Williamson, Khala N Clemons, Ronald L Snarr, Michael J McKenzie
Kliszczewicz, B, Markert, CD, Bechke, E, Williamson, C, Clemons, KN, Snarr, RL, and McKenzie, MJ. Acute effect of popular high-intensity functional training exercise on physiologic markers of growth. J Strength Cond Res XX(X): 000-000, 2018-Constantly evolving, high-intensity functional training (HIFT) exercise consists of various modalities, orders, weights, and repetition schemes. High-intensity functional training has gained popularity among the general population, but lacks empirical evidence regarding acute adaptive responses...
November 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30399115/sex-differences-in-physical-fitness-characteristics-and-match-play-demands-in-adolescent-netball-should-male-and-female-adolescents-co-compete-in-netball
#4
Kevin M Tissera, Geraldine A Naughton, Tim J Gabbett, Lyndon M Krause, Mark P Moresi, Amanda C Benson
Tissera, KM, Naughton, GA, Gabbett, TJ, Krause, LM, Moresi, MP, and Benson, AC. Sex differences in physical fitness characteristics and match-play demands in adolescent netball: Should male and female adolescents co-compete in netball? J Strength Cond Res XX(X): 000-000, 2018-Sports participation offers multifaceted benefits, especially during adolescence. However, policies relating to male and female adolescents co-competing in team sports can be prohibitive and lack an evidence base. This study aimed to strengthen evidence on coparticipation of male and female adolescents playing recreational netball...
November 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30395543/comparison-between-full-body-vs-split-body-resistance-exercise-on-the-brain-derived-neurotrophic-factor-and-immunometabolic-response
#5
Fabio S Lira, Marcelo Conrado de Freitas, Jose Gerosa-Neto, Jason M Cholewa, Fabrício E Rossi
Lira, FS, Conrado de Freitas, M, Gerosa-Neto, J, Cholewa, JM, and Rossi, FE. Comparison between full-body vs. split-body resistance exercise on the brain-derived neurotrophic factor immunometabolic response. J Strength Cond Res XX(X): 000-000, 2018-Intense aerobic exercise seems to increase serum concentrations of brain-derived neurotrophic factor (BDNF) in conjunction with increasing lactate; however, less is known about the BDNF response to differing resistance exercise protocols. We hypothesized that full-body (FB) resistance exercise will elicit a greater increase in serum BDNF and lactate compared with split-body resistance exercise...
November 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30358700/seasonal-changes-in-the-physical-performance-of-elite-youth-female-soccer-players
#6
Stacey Emmonds, Tom Sawczuk, Sean Scantlebury, Kev Till, Ben Jones
Emmonds, S, Sawczuk, T, Scantlebury, S, Till, K, and Jones, B. Seasonal changes in the physical performance of elite youth female soccer players. J Strength Cond Res XX(X): 000-000, 2018-This study investigated the seasonal change in physical performance of 113 (Under 10: U10 [n = 20], U12 [n = 30], U14 [n = 31], and U16 [n = 32]) elite youth female soccer players. Players completed testing pre-, mid-, and post-season, including speed (10- and 30-m sprint), change of direction (CoD; 505 test), power (countermovement jump [CMJ]), strength (isometric midthigh pull), and aerobic capacity (Yo-Yo intermittent recovery test level 1 [YYIRL1])...
October 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30358699/influence-of-perceptions-of-sleep-on-well-being-in-youth-athletes
#7
Thomas Sawczuk, Ben Jones, Sean Scantlebury, Kevin Till
Sawczuk, T, Jones, B, Scantlebury, S, and Till, K. Influence of perceptions of sleep on well-being in youth athletes. J Strength Cond Res XX(X): 000-000, 2018-To date, most research considering well-being questionnaires has only considered the training stress imposed on the athlete, without evaluating the questionnaire's relationship with a measure of recovery (e.g., sleep). This study aimed to assess the influence of sleep duration (Sduration), sleep quality (Squality), and sleep index (Sindex; Sduration × Squality) on well-being in youth athletes, while accounting for the known training stressors of training load and exposure to match play...
October 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30358698/effect-sizes-for-paired-data-should-use-the-change-score-variability-rather-than-the-pre-test-variability
#8
Scott J Dankel, Jeremy P Loenneke
Dankel, SJ and Loenneke, JP. Effect sizes for paired data should use the change score variability rather than the pre-test variability. J Strength Cond Res XX(X): 000-000, 2018-Effect sizes provide a universal statistic detailing the magnitude of an effect while removing the influence of the sample size. Effect sizes and statistical tests are closely related with the exception that the effect size illustrates the magnitude of an effect in SD units, whereas the test statistic illustrates the magnitude of effect in SE units...
October 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30358697/sprint-specific-training-in-youth-backward-running-vs-forward-running-training-on-speed-and-power-measures-in-adolescent-male-athletes
#9
Aaron Uthoff, Jon Oliver, John Cronin, Craig Harrison, Paul Winwood
Uthoff, A, Oliver, J, Cronin, J, Harrison, C, and Winwood, P. Sprint-specific training in youth: Backward running vs. forward running training on speed and power measures in adolescent male athletes. J Strength Cond Res XX(X): 000-000, 2018-This study compared the effects of 2 sprint-specific training programs against the natural development of speed, power, and stiffness in a group of adolescent male athletes. Forty-three male adolescents (aged 13-15 years) were randomly assigned to 1 of 2 training groups; backward running training (BRT = 26), or forward running training (FRT = 17)...
October 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30358696/physical-response-to-pad-and-bag-based-boxing-specific-training-modalities
#10
Mitchell J Finlay, Matt Greig, Jake McCarthy, Richard M Page
Finlay, MJ, Greig, M, McCarthy, J, and Page, RM. Physical response to pad- and bag-based boxing-specific training modalities. J Strength Cond Res XX(X): 000-000, 2018-This study examined the differences in the physical response elicited from a contemporary Boxing-Specific Exercise Protocol (BSEP) performed using a punch bag and a pad routine. Fourteen male elite amateur boxers (age = 22 ± 2 years; height = 176.9 ± 7.3 cm; body mass = 78.8 ± 8.7 kg; and V[Combining Dot Above]O2max = 55.94 ± 5.96 ml·kg·min) were recruited...
October 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30358695/national-scouting-combine-scores-as-performance-predictors-in-the-national-football-league
#11
Lisa M Vincent, Bryan J Blissmer, Disa L Hatfield
Vincent, LM, Blissmer, BJ, and Hatfield, DL. National Scouting Combine scores as performance predictors in the National Football League. J Strength Cond Res XX(X): 000-000, 2018-The National Football League (NFL) hosts an annual scouting combine to evaluate the approximately 300 elite college football players who are most likely to be selected in the upcoming NFL draft. Given the public interest, player obligations, coaching staff commitments, and business aspects of the combine, several questions have arose in recent years concerning the applicability of combine scores to eventual draft NFL performance...
October 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363042/effects-of-the-safety-squat-bar-on-trunk-and-lower-body-mechanics-during-a-back-squat
#12
Kara A Hecker, Lara A Carlson, Michael A Lawrence
Hecker, KA, Carlson, LA, and Lawrence, MA. Effects of the safety squat bar on trunk and lower-body mechanics during a back squat. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to determine whether the safety squat bar (SSB) alters the mechanics and muscle activity of a back squat compared with a standard barbell (ST). Motion and muscle activation of the trunk and lower extremity were measured while 12 competitive powerlifters (8 males, 4 females, age 31.5 ± 6.3 years, body mass 88...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363041/resistance-training-frequencies-of-3-and-6-times-per-week-produce-similar-muscular-adaptations-in-resistance-trained-men
#13
Juraj Saric, Domagoj Lisica, Ivan Orlic, Jozo Grgic, James W Krieger, Sasa Vuk, Brad J Schoenfeld
Saric, J, Lisica, D, Orlic, I, Grgic, J, Krieger, JW, Vuk, S, and Schoenfeld, BJ. Resistance training frequencies of 3 and 6 times per week produce similar muscular adaptations in resistance-trained men. J Strength Cond Res XX(X): 000-000, 2018-We examined the effects of resistance training (RT) frequency performed 3 times per week (RT3) vs. RT performed 6 times per week (RT6) under volume-equated conditions in resistance-trained men. Twenty-seven men were randomly allocated to RT3 (n = 14) or RT6 (n = 13)...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363040/muscle-damage-based-recovery-strategies-can-be-supported-by-predictive-capacity-of-specific-global-positioning-system-accelerometry-parameters-immediately-a-post-soccer-match-load
#14
Cristiano D da Silva, Guilherme Machado, Alex Andrade Fernandes, Israel Teoldo, Eduardo M Pimenta, João C B Marins, Emerson S Garcia
da Silva, CD, Machado, G, Fernandes, AA, Teoldo, I, Pimenta, EM, Marins, JCB, and Garcia, ES. Muscle damage-based recovery strategies can be supported by predictive capacity of specific global positioning system accelerometry parameters immediately after soccer match-load. J Strength Cond Res XX(X): 000-000, 2018-Soccer match-load can be linked to recovery kinetic markers. However, match variability hinders the magnitude of relationship between parameters of interest. Therefore, we examined the correlation between 21 global positioning system accelerometry (GPS-A) parameters and changes in serum creatine kinase (CK) concentrations, muscle soreness (MS), and perceptive recovery quality (PRQ) assessed at baseline (1 h before) and post (0 minute, 2, 4, and 24 hours) a standardized 90-minute match-simulation in 12 university players...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363039/influence-of-night-soccer-matches-on-sleep-in-elite-players
#15
Mathieu Nédélec, Brian Dawson, Grégory Dupont
Nédélec, M, Dawson, B, and Dupont, G. Influence of night soccer matches on sleep in elite players. J Strength Cond Res XX(X): 000-000, 2018-This study examined the impact of night matches on the sleep/wake behavior of elite soccer players participating in the UEFA Champions League and French Ligue 1. A mixed method approach was used, combining objective sleep assessment with wrist activity monitors, and a survey to ascertain the sleep complaints after night matches (kick off after 18:00 hours). Most players (90%) indicated worse sleep in the nights after evening matches than after training days...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363038/progressive-workload-periodization-maximizes-effects-of-nordic-hamstring-exercise-on-muscle-injury-risk-factors
#16
Lucas Severo-Silveira, Maurício P Dornelles, Felipe X Lima-E-Silva, César L Marchiori, Thales M Medeiros, Evangelos Pappas, Bruno M Baroni
Severo-Silveira, L, Dornelles, MP, Lima-e-Silva, FX, Marchiori, CL, Medeiros, TM, Pappas, E, and Baroni, BM. Progressive workload periodization maximizes effects of Nordic hamstring exercise on muscle injury risk factors. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to investigate the effect of 2 different Nordic hamstring exercise (NHE) training programs (constant workload vs. progressive workload) on multiple risk factors for hamstring strain injury in high competitive level athletes. Twenty-one premier league rugby union players (∼26 years) were randomized into 1 of 2 experimental groups and completed an 8-week NHE training program: constant training group (CTG) or progressive training group (PTG)...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363037/influence-of-the-box-dimensions-on-the-reliability-and-validity-of-the-sit-and-reach-in-preschoolers
#17
Carlos Ayán Pérez, Sofía Álvarez Pérez, Sara González Baamonde, Óscar Martínez de Quel
Ayán Pérez, C, Martínez de Quel, Ó, Álvarez Pérez, S, and González Baamonde, S. Influence of the box dimensions on the reliability and validity of the sit and reach in preschoolers. J Strength Cond Res XX(X): 000-000, 2018-This study aimed at analyzing the reliability and validity of the sit and reach (SR) test, when it was performed with a standard SR (SSR) or an adapted SR (ASR) box in preschoolers. To accomplish this, both tests were administered 3 times (familiarization, test, and retest) to a group of 148 children (mean age, 4...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363036/participation-and-performance-trends-in-the-itu-duathlon-world-championship-from-2003-to-2017
#18
Pantelis T Nikolaidis, Elias Villiger, Beat Knechtle
Nikolaidis, PT, Villiger, E, and Knechtle, B. Participation and performance trends in the ITU Duathlon World Championship from 2003 to 2017. J Strength Cond Res XX(X): 000-000, 2018-Participation and performance across years have been studied extensively in various endurance and ultra-endurance sports; however, less information exists with regards to duathlon (i.e., Run 1, Bike, and Run 2). The aim of this study was to examine performance and participation trends of duathletes competing either to short (10-km Run 1, 50-km Bike, and 5-km Run 2) or to long distance (10-km Run 1, 150-km Bike, and 30-km Run 2) in the Powerman World Championship "Powerman Zofingen...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363035/effect-of-a-high-intensity-isometric-potentiating-warm-up-on-bat-velocity
#19
Sheryl L Gilmore, Lorrie R Brilla, David N Suprak, Gordon R Chalmers, Dylan T Dahlquist
Gilmore, SL, Brilla, LR, Suprak, DN, Chalmers, GR, and Dahlquist, DT. Effect of a high-intensity isometric potentiating warm-up on bat velocity. J Strength Cond Res XX(X): 000-000, 2018-This study examined the acute effect of a high-intensity isometric potentiating warm-up on subsequent maximal horizontal bat velocity in experienced female softball players (n = 28). The isometric potentiating warm-up consisted of 3 sets of 5-second maximal voluntary contractions held in the early swing phase position, pulling against an immovable device...
October 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30363034/evaluation-of-a-goalkeeper-specific-adaptation-to-the-yo-yo-intermittent-recovery-test-level-1-reliability-and-variability
#20
Alex M Ehlert, John R Cone, Laurie Wideman, Allan H Goldfarb
Ehlert, AM, Cone, JR, Wideman, L, and Goldfarb, AH. Evaluation of a goalkeeper-specific adaptation to the Yo-Yo intermittent recovery test level 1: reliability and variability. J Strength Cond Res XX(X): 000-000, 2018-The Yo-Yo Intermittent Recovery Test Level 1 (YYIR1) has been shown to be a reliable test with strong correlations to physical match performance in field soccer players. However, the YYIR1 has less goalkeeper (GK) specificity. Therefore, the purpose of this study was to evaluate the test-retest reliability of a goalkeeper-specific adaptation of the YYIR1 (YYIR1-GK)...
October 22, 2018: Journal of Strength and Conditioning Research
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