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Journal of Strength and Conditioning Research

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https://read.qxmd.com/read/30985525/fat-free-mass-index-in-a-diverse-sample-of-male-collegiate-athletes
#1
Brad S Currier, Patrick S Harty, Hannah A Zabriskie, Richard A Stecker, Jessica M Moon, Andrew R Jagim, Chad M Kerksick
Currier, BS, Harty, PS, Zabriskie, HA, Stecker, RA, Moon, JM, Jagim, AR, and Kerksick, CM. Fat-free mass index in a diverse sample of male collegiate athletes. J Strength Cond Res XX(X): 000-000, 2019-Fat-free mass index (FFMI) is a body composition metric that has been used to assess relative muscularity in athletes. Fat-free mass index is calculated by dividing FFM by height squared, although further height corrections through linear regression may be needed in taller individuals. This study reported height-adjusted FFMI (FFMIAdj) data in 209 male collegiate athletes from 10 sports (baseball, cross country, football, golf, ice hockey, weightlifting, rugby, swimming, track and field, and water polo) and the FFMIAdj natural upper limit for sports with sufficient sample size...
April 10, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30985524/the-validity-of-a-global-navigation-satellite-system-for-quantifying-small-area-team-sport-movements
#2
Jace A Delaney, Taylor M Wileman, Nicholas J Perry, Heidi R Thornton, Mark P Moresi, Grant M Duthie
Delaney, JA, Wileman, TM, Perry, NJ, Thornton, HR, Moresi, MP, and Duthie, GM. The validity of a global navigation satellite system for quantifying small-area team-sport movements. J Strength Cond Res XX(X): 000-000, 2019-The recent development of global navigation satellite systems (GNSS) has improved the availability and signal strength of surrounding satellites compared with traditional global positioning systems, although their ability to quantify rapid changes in speed may still be limited. This study aimed to evaluate the validity of GNSS to quantify the mean speed (m·s) and acceleration (m·s) of movements typical to team sports...
April 10, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30985523/effect-of-col5a1-gdf5-and-ppara-genes-on-a-movement-screen-and-neuromuscular-performance-in-adolescent-team-sport-athletes
#3
Petr Stastny, Michal Lehnert, Mark De Ste Croix, Miroslav Petr, Zdenek Svoboda, Eliska Maixnerova, Renata Varekova, Michal Botek, Martin Petrek, Lenka Kocourkova, Pawel Cięszczyk
Stastny, P, Lehnert, M, De Ste Croix, M, Petr, M, Svoboda, Z, Maixnerova, E, Varekova, R, Botek, M, Petrek, M, Lenka, K, and Cięszczyk, P. Effect of COL5A1, GDF5, and PPARA genes on a movement screen and neuromuscular performance in adolescent team sport athletes. J Strength Cond Res 12XX(2X): 000-000, 2019-The risk of injury increases with adolescents' chronological age and may be related to limited muscle function neuromuscular, genetic, and biomechanical factors. The purpose of this study was to determine whether COL5A1, PPARA, and GDF5 genes are associated with muscle functions and stretch-shortening cycle performance in adolescent athletes...
April 10, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30985522/altered-physical-performance-following-advanced-special-operations-tactical-training
#4
Joshua D Winters, Nicholas R Heebner, Alexa K Johnson, Kathleen M Poploski, Scott D Royer, Takashi Nagai, Carson A Randall, John P Abt, Scott M Lephart
Winters, JD, Heebner, NR, Johnson, AK, Poploski, KM, Royer, SD, Nagai, T, Randall, CA, Abt, JP, and Lephart, SM. Altered physical performance following advanced special operations tactical training. J Strength Cond Res XX(X): 000-000, 2019-The purpose of this study was to determine how the unique challenges of specific military tactical training phases influence overall physical performance characteristics. Broad jump, 5-10-5, 300-yd shuttle, percent body fat (%BF), anaerobic power (AP) and anaerobic capacity (AC), maximal oxygen uptake (V[Combining Dot Above]O2max), isokinetic knee extension/flexion strength, shoulder internal/external rotation strength, and trunk extension/flexion strength were collected on 73 United States Marine Corps Forces Special Operations Command (MARSOC) students (age: 27...
April 10, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946268/plyometric-training-improves-not-only-measures-of-linear-speed-power-and-change-of-direction-speed-but-also-repeated-sprint-ability-in-female-young-handball-players
#5
Helmi Chaabene, Yassine Negra, Jason Moran, Olaf Prieske, Senda Sammoud, Rodrigo Ramirez-Campillo, Urs Granacher
Chaabene, H, Negra, Y, Moran, J, Prieske, O, Sammoud, S, Ramirez-Campillo, R, and Granacher, U. Plyometric training improves not only measures of linear speed, power, and change-of-direction speed but also repeated sprint ability in female young handball players. J Strength Cond Res XX(X): 000-000, 2019-This study examined the effects of an 8-week plyometric training (PT) program on components of physical fitness in female young handball players. Twenty-one female adolescent handball players were assigned to an experimental group (EG, n = 12; age = 15...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946267/neuromuscular-jumping-performance-and-upper-body-horizontal-power-of-volleyball-players
#6
Carlota A Gonçalves, Tiago J D Lopes, Célia Nunes, Daniel A Marinho, Henrique P Neiva
Gonçalves, CA, Lopes, TJD, Nunes, C, Marinho, DA, and Neiva, HP. Neuromuscular jumping performance and upper-body horizontal power of volleyball players. J Strength Cond Res XX(X): 000-000, 2019-The aim of the current study was to characterize the neuromuscular jumping performance and upper-body horizontal power of elite and subelite volleyball players. In addition, those neuromuscular performances were compared between field positions. One hundred twenty-two male volleyball players participated in the study: 83 elite players (mean ± SD: 24...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946266/biomechanical-comparison-of-the-reverse-hyperextension-machine-and-the-hyperextension-exercise
#7
Michael A Lawrence, Andrew Chin, Brian T Swanson
Lawrence, MA, Chin, A, and Swanson, BT. Biomechanical comparison of the reverse hyperextension machine and the hyperextension exercise. J Strength Cond Res XX(X): 000-000, 2019-The purpose of this study was to compare activation of the erector spinae, gluteus maximus, and biceps femoris muscles, lower back extension moment, and lower extremity range of motion (ROM) between the reverse hyperextension (RHE) and hyperextension (HE) exercises. Motion and muscle activation of the trunk and lower extremity were measured while 20 recreationally active individuals performed 2 sets of 10 repetitions of each exercise...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946265/effect-of-bench-press-load-knowledge-on-one-repetition-maximum-strength
#8
Ronald L Snarr, Kara Adams, Jordan Cook
Snarr, RL, Adams, K, and Cook, J. Effect of bench press load knowledge on one repetition maximum strength. J Strength Cond Res XX(X): 000-000, 2019-Knowledge of a given load and visual feedback are crucial while performing a given task. Although previous literature has examined the consequences of lifting a submaximal weight, the removal of load knowledge has yet to be examined under maximal effort. Therefore, the purpose of this investigation was to examine the differences in 1 repetition maximum (1RM) bench press values between a known and unknown external load...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946264/load-power-relationships-for-high-speed-knee-extension-exercise
#9
Ling Chen, Steve W Davison, Ema A Selimovic, Rebecca E Mueller, Samantha R Beatty, Kathy A Carter, Prashant J Parmar, Thorburn B Symons, George M Pantalos, John F Caruso
Chen, L, Davison, SW, Selimovic, EA, Mueller, RE, Beatty, SR, Carter, KA, Parmar, PJ, Symons, TB, Pantalos, GM, and Caruso, JF. Load-power relationships for high-speed knee extension exercise. J Strength Cond Res XX(X): 000-000, 2019-Seventy subjects did 4 knee extensor workouts with their left legs to assess load-power relationships produced on a high-speed trainer (HST; Newnan, GA, USA). Each workout is composed of 4 sets done on the HST at a different load (1, 4.4, 6.7, 9 kg). A Latin Squares Design determined load sequence per workout...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946263/concurrent-validity-of-field-based-diagnostic-technology-monitoring-movement-velocity-in-powerlifting-exercises
#10
Benedikt Mitter, Dominik Hölbling, Pascal Bauer, Michael Stöckl, Arnold Baca, Harald Tschan
Mitter, B, Hölbling, D, Bauer, P, Stöckl, M, Baca, A, and Tschan, H. Concurrent validity of field-based diagnostic technology monitoring movement velocity in powerlifting exercises. J Strength Cond Res XX(X): 000-000, 2019-The study was designed to investigate the validity of different technologies used to determine movement velocity in resistance training. Twenty-four experienced powerlifters (18 male and 6 female; age, 25.1 ± 5.1 years) completed a progressive loading test in the squat, bench press, and conventional deadlift until reaching their 1 repetition maximum...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946262/reliability-and-validity-of-a-new-portable-tethered-sprint-running-test-as-a-measure-of-maximal-anaerobic-performance
#11
Mirjam Limmer, Alina Berkholz, Markus de Marées, Petra Platen
Limmer, M, Berkholz, A, de Marées, M, and Platen, P. Reliability and validity of a new portable tethered sprint running test as a measure of maximal anaerobic performance. J Strength Cond Res XX(X): 000-000, 2019-The purposes of this study were to develop a new portable tethered sprint running (PTSR) test for field-based anaerobic performance testing with restricted spatial conditions and the logistical challenge of carrying test equipment, and to determine reliability of the PTSR test. For validity, performance measures were compared with the cycle ergometer Wingate Anaerobic Test (WAnT) power outputs...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946261/effect-of-interset-strategies-on-acute-resistance-training-performance-and-physiological-responses-a-systematic-review
#12
Christopher Latella, Jozo Grgic, Dan Van der Westhuizen
Latella, C, Grgic, J, and Van der Westhuizen, D. Effect of interset strategies on acute resistance training performance and physiological responses: a systematic review. J Strength Cond Res XX(X): 000-000, 2019-The purpose of this systematic review was to evaluate the evidence surrounding the implementation of interset strategies to optimize acute resistance training performance. Searches of PubMed/MEDLINE, Scopus, and SPORTDiscus electronic databases were conducted. Studies that met the following criteria were included: (a) compared an interset strategy with a traditional passive rest interval in resistance training, (b) the assessed outcomes included performance or physiological responses, (c) resistance training was performed in a traditional dynamic fashion, (d) the study had an acute design, and (e) was published in English and in a peer-reviewed journal...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30946260/evaluating-the-effects-of-a-novel-neuromuscular-neck-training-device-on-multiplanar-static-and-dynamic-neck-strength-a-pilot-study
#13
Theodore H Versteegh, James P Dickey, Carolyn A Emery, Lisa K Fischer, Joy C MacDermid, David M Walton
Versteegh, TH, Dickey, JP, Emery, CA, Fischer, LK, MacDermid, JC, and Walton, DM. Evaluating the effects of a novel neuromuscular neck training device on multiplanar static and dynamic neck strength: A pilot study. J Strength Cond Res XX(X): 000-000, 2019-The neck serves an important function in damping the transference of acceleration forces between the head and the trunk, such as that occurring during contact sports or motor vehicle collisions. An inability to adequately dissipate forces has been proposed as a potential mechanism for clinical conditions such as whiplash or concussion, but current approaches to neck training may not be targeting the correct mechanisms...
April 1, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30908365/effects-of-different-weekly-sets-equated-resistance-training-frequencies-on-muscular-strength-muscle-mass-and-body-fat-in-older-women
#14
Fábio L C Pina, João Pedro Nunes, Brad J Schoenfeld, Matheus A Nascimento, Aline M Gerage, Renata S B Januário, Nelson H Carneiro, Edilson S Cyrino, Arli R Oliveira
Pina, FLC, Nunes, JP, Schoenfeld, BJ, Nascimento, MA, Gerage, AM, Januário, RSB, Carneiro, NH, Cyrino, ES, and Oliveira, AR. Effects of different weekly sets-equated resistance training frequencies on muscular strength, muscle mass and body fat in older women. J Strength Cond Res XX(X): 000-000, 2019-The aim of this study was to analyze the effects of different resistance training (RT) frequencies (2 vs. 3 times per week) with an equivalent number of weekly sets performed between conditions on muscular strength and body composition in older women...
March 22, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30908378/criterion-validity-of-force-and-power-outputs-for-a-commonly-used-flywheel-resistance-training-device-and-bluetooth-app
#15
Jonathon Weakley, Bruno Fernández-Valdés, Liam Thomas, Carlos Ramirez-Lopez, Ben Jones
Weakley, J, Fernández-Valdés, B, Thomas, L, Ramirez-Lopez, C, and Jones, B. Criterion validity of force and power outputs for a commonly used flywheel resistance training device and bluetooth app. J Strength Cond Res XX(X): 000-000, 2019-Flywheels are a resistance training device that can increase lean body mass, strength, and power. However, because of their unique design and the inertia from the concentric portion directly relating to the force that is applied during the eccentric portion, monitoring the training stimulus can be difficult...
March 20, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30908377/changes-in-blood-concentration-of-adenosine-triphosphate-metabolism-biomarkers-during-incremental-exercise-in-highly-trained-athletes-of-different-sport-specializations
#16
Michał Włodarczyk, Krzysztof Kusy, Ewa Słomińska, Zbigniew Krasiński, Jacek Zieliński
Włodarczyk, M, Kusy, K, Słomińska, E, Krasiński, Z, and Zieliński, J. Changes in blood concentration of adenosine triphosphate metabolism biomarkers during incremental exercise in highly trained athletes of different sport specializations. J Strength Cond Res XX(X): 000-000, 2019-We hypothesized that (a) high-level specialized sport training causes different adaptations that induce specific biomarker release dynamics during exercise and recovery and (b) skeletal muscle mass affects biomarker release. Eleven sprinters (21-30 years), 16 endurance runners (18-31 years), 12 futsal players (18-29 years), and 12 amateur runners as controls (22-33 years) were examined...
March 20, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30908376/effect-of-overload-and-tapering-on-individual-heart-rate-variability-stress-tolerance-and-intermittent-running-performance-in-soccer-players-during-a-preseason
#17
Diego H Figueiredo, Diogo H Figueiredo, Alexandre Moreira, Helcio R Gonçalves, Luiz C R Stanganelli
Figueiredo, DH, Figueiredo, DH, Moreira, A, Gonçalves, HR, and Stanganelli, LCR. Effect of overload and tapering on individual heart rate variability, stress tolerance, and intermittent running performance in soccer players during a preseason. J Strength Cond Res XX(X): 000-000, 2019-This study evaluates the weekly natural log of the root-mean-square difference of successive R-R intervals (lnRMSSDmean), its coefficient of variation (lnRMSSDcv), training load (TL), stress tolerance (ST), and changes in intermittent running performance in response to a 2-week overload (OL) followed by a 1-week taper (TP) during a preseason...
March 20, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30908375/global-positioning-system-monitoring-of-selected-physical-demands-of-ncaa-division-i-football-players-during-games
#18
Garrett E Bayliff, Bert H Jacobson, Masoud Moghaddam, Carlos Estrada
Bayliff, GE, Jacobson, BH, Moghaddam, M, and Estrada, C. Global positioning system monitoring of selected physical demands of NCAA Division I football players during games. J Strength Cond Res XX(X): 000-000, 2019-Global positioning system (GPS) tracking of athletes in selected sports is a new innovation into obtaining comprehensive data regarding physical output with respect to distance travelled (DT), acceleration, and change of direction. The purpose of this study was to determine selected physical demands of American football players during the course of games and to compare such data by player position...
March 20, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30893281/is-what-you-see-what-you-get-perceptions-of-personal-trainers-competence-knowledge-and-preferred-sex-of-personal-trainer-relative-to-physique
#19
Patrick R Boerner, Katherine M Polasek, Larissa True, Erik Lind, Joy L Hendrick
Boerner, PR, Polasek, KM, True, L, Lind, E, and Hendrick, JL. Is what you see what you get? Perceptions of personal trainers' competence, knowledge, and preferred sex of personal trainer relative to physique. J Strength Cond Res XX(X): 000-000, 2018-The role that a personal trainer's (PT) physique plays in how potential clients perceive the PT is an understudied, yet potentially powerful area of inquiry that has important professional implications. The purpose of this study was to investigate how a PT's physique could influence perceptions of his/her (a) PT competence, (b) level of personal training knowledge, and (c) preferred sex of the PT...
March 18, 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30893280/power-related-determinants-of-modified-agility-t-test-performance-in-male-adolescent-basketball-players
#20
Aaron T Scanlan, Neal Wen, David B Pyne, Emilija Stojanović, Zoran Milanović, Daniele Conte, Alejandro Vaquera, Vincent J Dalbo
Scanlan, AT, Wen, N, Pyne, DB, Stojanović, E, Milanović, Z, Conte, D, Vaquera, A, and Dalbo, VJ. Power-related determinants of Modified Agility T-test performance in male adolescent basketball players. J Strength Cond Res XX(X): 000-000, 2019-Although the Modified Agility T-test (MAT) has been advocated for assessing change-of-direction performance in basketball, the power-related attributes emphasized during the test are unknown. Therefore, the aim of this study was to identify the power-related determinants of the MAT in basketball players...
March 18, 2019: Journal of Strength and Conditioning Research
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